mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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7d10cffc37
Automatic merge from submit-queue Only set sysctls for infra containers We did set the sysctls for each container in a pod. This opens up a way to set un-whitelisted sysctls during upgrade from v1.3: - set annotation in v1.3 with an un-whitelisted sysctl. Set restartPolicy=Always - upgrade cluster to v1.4 - kill container process - un-whitelisted sysctl is set on restart of the killed container.
2660 lines
100 KiB
Go
2660 lines
100 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package dockertools
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import (
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"bytes"
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"crypto/md5"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/coreos/go-semver/semver"
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dockertypes "github.com/docker/engine-api/types"
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dockercontainer "github.com/docker/engine-api/types/container"
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dockerstrslice "github.com/docker/engine-api/types/strslice"
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dockerapiversion "github.com/docker/engine-api/types/versions"
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dockernat "github.com/docker/go-connections/nat"
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"github.com/golang/glog"
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cadvisorapi "github.com/google/cadvisor/info/v1"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/client/record"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/kubelet/events"
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"k8s.io/kubernetes/pkg/kubelet/images"
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"k8s.io/kubernetes/pkg/kubelet/lifecycle"
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"k8s.io/kubernetes/pkg/kubelet/metrics"
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"k8s.io/kubernetes/pkg/kubelet/network"
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"k8s.io/kubernetes/pkg/kubelet/network/hairpin"
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proberesults "k8s.io/kubernetes/pkg/kubelet/prober/results"
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"k8s.io/kubernetes/pkg/kubelet/qos"
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"k8s.io/kubernetes/pkg/kubelet/types"
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"k8s.io/kubernetes/pkg/kubelet/util/cache"
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"k8s.io/kubernetes/pkg/kubelet/util/format"
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"k8s.io/kubernetes/pkg/runtime"
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"k8s.io/kubernetes/pkg/security/apparmor"
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"k8s.io/kubernetes/pkg/securitycontext"
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kubetypes "k8s.io/kubernetes/pkg/types"
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"k8s.io/kubernetes/pkg/util/flowcontrol"
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"k8s.io/kubernetes/pkg/util/oom"
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"k8s.io/kubernetes/pkg/util/procfs"
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utilruntime "k8s.io/kubernetes/pkg/util/runtime"
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"k8s.io/kubernetes/pkg/util/selinux"
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"k8s.io/kubernetes/pkg/util/sets"
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utilstrings "k8s.io/kubernetes/pkg/util/strings"
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"k8s.io/kubernetes/pkg/util/term"
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)
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const (
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DockerType = "docker"
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// https://docs.docker.com/engine/reference/api/docker_remote_api/
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// docker version should be at least 1.9.x
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minimumDockerAPIVersion = "1.21"
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// Remote API version for docker daemon versions
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// https://docs.docker.com/engine/reference/api/docker_remote_api/
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dockerV110APIVersion = "1.22"
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DockerV112APIVersion = "1.24"
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// ndots specifies the minimum number of dots that a domain name must contain for the resolver to consider it as FQDN (fully-qualified)
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// we want to able to consider SRV lookup names like _dns._udp.kube-dns.default.svc to be considered relative.
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// hence, setting ndots to be 5.
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ndotsDNSOption = "options ndots:5\n"
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// In order to avoid unnecessary SIGKILLs, give every container a minimum grace
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// period after SIGTERM. Docker will guarantee the termination, but SIGTERM is
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// potentially dangerous.
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// TODO: evaluate whether there are scenarios in which SIGKILL is preferable to
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// SIGTERM for certain process types, which may justify setting this to 0.
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minimumGracePeriodInSeconds = 2
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DockerNetnsFmt = "/proc/%v/ns/net"
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// String used to detect docker host mode for various namespaces (e.g.
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// networking). Must match the value returned by docker inspect -f
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// '{{.HostConfig.NetworkMode}}'.
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namespaceModeHost = "host"
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// The expiration time of version cache.
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versionCacheTTL = 60 * time.Second
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)
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var (
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// DockerManager implements the Runtime interface.
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_ kubecontainer.Runtime = &DockerManager{}
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// TODO: make this a TTL based pull (if image older than X policy, pull)
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podInfraContainerImagePullPolicy = api.PullIfNotPresent
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// Default set of seccomp security options.
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defaultSeccompOpt = []dockerOpt{{"seccomp", "unconfined", ""}}
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)
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type DockerManager struct {
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client DockerInterface
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recorder record.EventRecorder
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containerRefManager *kubecontainer.RefManager
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os kubecontainer.OSInterface
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machineInfo *cadvisorapi.MachineInfo
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// The image name of the pod infra container.
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podInfraContainerImage string
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// (Optional) Additional environment variables to be set for the pod infra container.
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podInfraContainerEnv []api.EnvVar
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// TODO(yifan): Record the pull failure so we can eliminate the image checking?
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// Lower level docker image puller.
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dockerPuller DockerPuller
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// wrapped image puller.
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imagePuller images.ImageManager
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// Root of the Docker runtime.
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dockerRoot string
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// Directory of container logs.
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containerLogsDir string
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// Network plugin.
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networkPlugin network.NetworkPlugin
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// Health check results.
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livenessManager proberesults.Manager
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// RuntimeHelper that wraps kubelet to generate runtime container options.
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runtimeHelper kubecontainer.RuntimeHelper
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// Runner of lifecycle events.
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runner kubecontainer.HandlerRunner
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// Handler used to execute commands in containers.
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execHandler ExecHandler
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// Used to set OOM scores of processes.
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oomAdjuster *oom.OOMAdjuster
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// Get information from /proc mount.
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procFs procfs.ProcFSInterface
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// If true, enforce container cpu limits with CFS quota support
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cpuCFSQuota bool
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// Container GC manager
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containerGC *containerGC
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// Support for gathering custom metrics.
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enableCustomMetrics bool
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// If true, the "hairpin mode" flag is set on container interfaces.
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// A false value means the kubelet just backs off from setting it,
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// it might already be true.
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configureHairpinMode bool
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// Provides image stats
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*imageStatsProvider
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// The version cache of docker daemon.
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versionCache *cache.ObjectCache
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// Directory to host local seccomp profiles.
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seccompProfileRoot string
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}
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// A subset of the pod.Manager interface extracted for testing purposes.
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type podGetter interface {
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GetPodByUID(kubetypes.UID) (*api.Pod, bool)
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}
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func PodInfraContainerEnv(env map[string]string) kubecontainer.Option {
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return func(rt kubecontainer.Runtime) {
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dm := rt.(*DockerManager)
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for k, v := range env {
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dm.podInfraContainerEnv = append(dm.podInfraContainerEnv, api.EnvVar{
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Name: k,
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Value: v,
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})
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}
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}
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}
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func NewDockerManager(
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client DockerInterface,
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recorder record.EventRecorder,
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livenessManager proberesults.Manager,
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containerRefManager *kubecontainer.RefManager,
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podGetter podGetter,
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machineInfo *cadvisorapi.MachineInfo,
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podInfraContainerImage string,
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qps float32,
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burst int,
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containerLogsDir string,
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osInterface kubecontainer.OSInterface,
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networkPlugin network.NetworkPlugin,
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runtimeHelper kubecontainer.RuntimeHelper,
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httpClient types.HttpGetter,
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execHandler ExecHandler,
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oomAdjuster *oom.OOMAdjuster,
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procFs procfs.ProcFSInterface,
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cpuCFSQuota bool,
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imageBackOff *flowcontrol.Backoff,
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serializeImagePulls bool,
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enableCustomMetrics bool,
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hairpinMode bool,
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seccompProfileRoot string,
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options ...kubecontainer.Option) *DockerManager {
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// Wrap the docker client with instrumentedDockerInterface
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client = NewInstrumentedDockerInterface(client)
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// Work out the location of the Docker runtime, defaulting to /var/lib/docker
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// if there are any problems.
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dockerRoot := "/var/lib/docker"
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dockerInfo, err := client.Info()
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if err != nil {
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glog.Errorf("Failed to execute Info() call to the Docker client: %v", err)
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glog.Warningf("Using fallback default of /var/lib/docker for location of Docker runtime")
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} else {
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dockerRoot = dockerInfo.DockerRootDir
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glog.Infof("Setting dockerRoot to %s", dockerRoot)
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}
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dm := &DockerManager{
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client: client,
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recorder: recorder,
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containerRefManager: containerRefManager,
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os: osInterface,
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machineInfo: machineInfo,
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podInfraContainerImage: podInfraContainerImage,
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dockerPuller: newDockerPuller(client),
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dockerRoot: dockerRoot,
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containerLogsDir: containerLogsDir,
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networkPlugin: networkPlugin,
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livenessManager: livenessManager,
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runtimeHelper: runtimeHelper,
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execHandler: execHandler,
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oomAdjuster: oomAdjuster,
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procFs: procFs,
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cpuCFSQuota: cpuCFSQuota,
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enableCustomMetrics: enableCustomMetrics,
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configureHairpinMode: hairpinMode,
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imageStatsProvider: newImageStatsProvider(client),
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seccompProfileRoot: seccompProfileRoot,
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}
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dm.runner = lifecycle.NewHandlerRunner(httpClient, dm, dm)
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dm.imagePuller = images.NewImageManager(kubecontainer.FilterEventRecorder(recorder), dm, imageBackOff, serializeImagePulls, qps, burst)
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dm.containerGC = NewContainerGC(client, podGetter, containerLogsDir)
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dm.versionCache = cache.NewObjectCache(
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func() (interface{}, error) {
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return dm.getVersionInfo()
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},
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versionCacheTTL,
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)
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// apply optional settings..
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for _, optf := range options {
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optf(dm)
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}
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return dm
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}
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// GetContainerLogs returns logs of a specific container. By
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// default, it returns a snapshot of the container log. Set 'follow' to true to
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// stream the log. Set 'follow' to false and specify the number of lines (e.g.
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// "100" or "all") to tail the log.
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// TODO: Make 'RawTerminal' option flagable.
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func (dm *DockerManager) GetContainerLogs(pod *api.Pod, containerID kubecontainer.ContainerID, logOptions *api.PodLogOptions, stdout, stderr io.Writer) error {
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container, err := dm.client.InspectContainer(containerID.ID)
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if err != nil {
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return err
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}
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return GetContainerLogs(dm.client, pod, containerID, logOptions, stdout, stderr, container.Config.Tty)
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}
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// Temporarily export this function to share with dockershim.
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// TODO: clean this up.
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func GetContainerLogs(client DockerInterface, pod *api.Pod, containerID kubecontainer.ContainerID, logOptions *api.PodLogOptions, stdout, stderr io.Writer, rawTerm bool) error {
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var since int64
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if logOptions.SinceSeconds != nil {
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t := unversioned.Now().Add(-time.Duration(*logOptions.SinceSeconds) * time.Second)
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since = t.Unix()
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}
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if logOptions.SinceTime != nil {
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since = logOptions.SinceTime.Unix()
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}
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opts := dockertypes.ContainerLogsOptions{
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ShowStdout: true,
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ShowStderr: true,
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Since: strconv.FormatInt(since, 10),
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Timestamps: logOptions.Timestamps,
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Follow: logOptions.Follow,
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}
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if logOptions.TailLines != nil {
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opts.Tail = strconv.FormatInt(*logOptions.TailLines, 10)
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}
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sopts := StreamOptions{
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OutputStream: stdout,
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ErrorStream: stderr,
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RawTerminal: rawTerm,
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}
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return client.Logs(containerID.ID, opts, sopts)
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}
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var (
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// ErrNoContainersInPod is returned when there are no containers for a given pod
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ErrNoContainersInPod = errors.New("NoContainersInPod")
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// ErrNoPodInfraContainerInPod is returned when there is no pod infra container for a given pod
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ErrNoPodInfraContainerInPod = errors.New("NoPodInfraContainerInPod")
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// ErrContainerCannotRun is returned when a container is created, but cannot run properly
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ErrContainerCannotRun = errors.New("ContainerCannotRun")
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)
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// determineContainerIP determines the IP address of the given container. It is expected
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// that the container passed is the infrastructure container of a pod and the responsibility
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// of the caller to ensure that the correct container is passed.
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func (dm *DockerManager) determineContainerIP(podNamespace, podName string, container *dockertypes.ContainerJSON) (string, error) {
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result := ""
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if container.NetworkSettings != nil {
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result = container.NetworkSettings.IPAddress
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// Fall back to IPv6 address if no IPv4 address is present
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if result == "" {
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result = container.NetworkSettings.GlobalIPv6Address
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}
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}
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networkMode := getDockerNetworkMode(container)
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isHostNetwork := networkMode == namespaceModeHost
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// For host networking or default network plugin, GetPodNetworkStatus doesn't work
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if !isHostNetwork && dm.networkPlugin.Name() != network.DefaultPluginName {
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netStatus, err := dm.networkPlugin.GetPodNetworkStatus(podNamespace, podName, kubecontainer.DockerID(container.ID).ContainerID())
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if err != nil {
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glog.Errorf("NetworkPlugin %s failed on the status hook for pod '%s' - %v", dm.networkPlugin.Name(), podName, err)
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return result, err
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} else if netStatus != nil {
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result = netStatus.IP.String()
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}
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}
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return result, nil
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}
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func (dm *DockerManager) inspectContainer(id string, podName, podNamespace string) (*kubecontainer.ContainerStatus, string, error) {
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var ip string
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iResult, err := dm.client.InspectContainer(id)
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if err != nil {
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return nil, ip, err
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}
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glog.V(4).Infof("Container inspect result: %+v", *iResult)
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// TODO: Get k8s container name by parsing the docker name. This will be
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// replaced by checking docker labels eventually.
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dockerName, hash, err := ParseDockerName(iResult.Name)
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if err != nil {
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return nil, ip, fmt.Errorf("Unable to parse docker name %q", iResult.Name)
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}
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containerName := dockerName.ContainerName
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var containerInfo *labelledContainerInfo
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containerInfo = getContainerInfoFromLabel(iResult.Config.Labels)
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parseTimestampError := func(label, s string) {
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glog.Errorf("Failed to parse %q timestamp %q for container %q of pod %q", label, s, id, kubecontainer.BuildPodFullName(podName, podNamespace))
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}
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var createdAt, startedAt, finishedAt time.Time
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if createdAt, err = ParseDockerTimestamp(iResult.Created); err != nil {
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parseTimestampError("Created", iResult.Created)
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}
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if startedAt, err = ParseDockerTimestamp(iResult.State.StartedAt); err != nil {
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parseTimestampError("StartedAt", iResult.State.StartedAt)
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}
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if finishedAt, err = ParseDockerTimestamp(iResult.State.FinishedAt); err != nil {
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parseTimestampError("FinishedAt", iResult.State.FinishedAt)
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}
|
|
|
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// default to the image ID, but try and inspect for the RepoDigests
|
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imageID := DockerPrefix + iResult.Image
|
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imgInspectResult, err := dm.client.InspectImageByID(iResult.Image)
|
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if err != nil {
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utilruntime.HandleError(fmt.Errorf("unable to inspect docker image %q while inspecting docker container %q: %v", iResult.Image, containerName, err))
|
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} else {
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if len(imgInspectResult.RepoDigests) > 1 {
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glog.V(4).Infof("Container %q had more than one associated RepoDigest (%v), only using the first", containerName, imgInspectResult.RepoDigests)
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|
}
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|
|
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if len(imgInspectResult.RepoDigests) > 0 {
|
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imageID = DockerPullablePrefix + imgInspectResult.RepoDigests[0]
|
|
}
|
|
}
|
|
|
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status := kubecontainer.ContainerStatus{
|
|
Name: containerName,
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|
RestartCount: containerInfo.RestartCount,
|
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Image: iResult.Config.Image,
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ImageID: imageID,
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ID: kubecontainer.DockerID(id).ContainerID(),
|
|
ExitCode: iResult.State.ExitCode,
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|
CreatedAt: createdAt,
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Hash: hash,
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|
}
|
|
if iResult.State.Running {
|
|
// Container that are running, restarting and paused
|
|
status.State = kubecontainer.ContainerStateRunning
|
|
status.StartedAt = startedAt
|
|
if containerName == PodInfraContainerName {
|
|
ip, err = dm.determineContainerIP(podNamespace, podName, iResult)
|
|
// Kubelet doesn't handle the network error scenario
|
|
if err != nil {
|
|
status.State = kubecontainer.ContainerStateUnknown
|
|
status.Message = fmt.Sprintf("Network error: %#v", err)
|
|
}
|
|
}
|
|
return &status, ip, nil
|
|
}
|
|
|
|
// Find containers that have exited or failed to start.
|
|
if !finishedAt.IsZero() || iResult.State.ExitCode != 0 {
|
|
// Containers that are exited, dead or created (docker failed to start container)
|
|
// When a container fails to start State.ExitCode is non-zero, FinishedAt and StartedAt are both zero
|
|
reason := ""
|
|
message := iResult.State.Error
|
|
|
|
// Note: An application might handle OOMKilled gracefully.
|
|
// In that case, the container is oom killed, but the exit
|
|
// code could be 0.
|
|
if iResult.State.OOMKilled {
|
|
reason = "OOMKilled"
|
|
} else if iResult.State.ExitCode == 0 {
|
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reason = "Completed"
|
|
} else if !finishedAt.IsZero() {
|
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reason = "Error"
|
|
} else {
|
|
// finishedAt is zero and ExitCode is nonZero occurs when docker fails to start the container
|
|
reason = ErrContainerCannotRun.Error()
|
|
// Adjust time to the time docker attempted to run the container, otherwise startedAt and finishedAt will be set to epoch, which is misleading
|
|
finishedAt = createdAt
|
|
startedAt = createdAt
|
|
}
|
|
|
|
terminationMessagePath := containerInfo.TerminationMessagePath
|
|
if terminationMessagePath != "" {
|
|
for _, mount := range iResult.Mounts {
|
|
if mount.Destination == terminationMessagePath {
|
|
path := mount.Source
|
|
if data, err := ioutil.ReadFile(path); err != nil {
|
|
message = fmt.Sprintf("Error on reading termination-log %s: %v", path, err)
|
|
} else {
|
|
message = string(data)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
status.State = kubecontainer.ContainerStateExited
|
|
status.Message = message
|
|
status.Reason = reason
|
|
status.StartedAt = startedAt
|
|
status.FinishedAt = finishedAt
|
|
} else {
|
|
// Non-running containers that are created (not yet started or kubelet failed before calling
|
|
// start container function etc.) Kubelet doesn't handle these scenarios yet.
|
|
status.State = kubecontainer.ContainerStateUnknown
|
|
}
|
|
return &status, "", nil
|
|
}
|
|
|
|
// makeEnvList converts EnvVar list to a list of strings, in the form of
|
|
// '<key>=<value>', which can be understood by docker.
|
|
func makeEnvList(envs []kubecontainer.EnvVar) (result []string) {
|
|
for _, env := range envs {
|
|
result = append(result, fmt.Sprintf("%s=%s", env.Name, env.Value))
|
|
}
|
|
return
|
|
}
|
|
|
|
// makeMountBindings converts the mount list to a list of strings that
|
|
// can be understood by docker.
|
|
// Each element in the string is in the form of:
|
|
// '<HostPath>:<ContainerPath>', or
|
|
// '<HostPath>:<ContainerPath>:ro', if the path is read only, or
|
|
// '<HostPath>:<ContainerPath>:Z', if the volume requires SELinux
|
|
// relabeling
|
|
func makeMountBindings(mounts []kubecontainer.Mount) (result []string) {
|
|
for _, m := range mounts {
|
|
bind := fmt.Sprintf("%s:%s", m.HostPath, m.ContainerPath)
|
|
if m.ReadOnly {
|
|
bind += ":ro"
|
|
}
|
|
if m.SELinuxRelabel && selinux.SELinuxEnabled() {
|
|
if m.ReadOnly {
|
|
bind += ",Z"
|
|
} else {
|
|
bind += ":Z"
|
|
}
|
|
|
|
}
|
|
result = append(result, bind)
|
|
}
|
|
return
|
|
}
|
|
|
|
func makePortsAndBindings(portMappings []kubecontainer.PortMapping) (map[dockernat.Port]struct{}, map[dockernat.Port][]dockernat.PortBinding) {
|
|
exposedPorts := map[dockernat.Port]struct{}{}
|
|
portBindings := map[dockernat.Port][]dockernat.PortBinding{}
|
|
for _, port := range portMappings {
|
|
exteriorPort := port.HostPort
|
|
if exteriorPort == 0 {
|
|
// No need to do port binding when HostPort is not specified
|
|
continue
|
|
}
|
|
interiorPort := port.ContainerPort
|
|
// Some of this port stuff is under-documented voodoo.
|
|
// See http://stackoverflow.com/questions/20428302/binding-a-port-to-a-host-interface-using-the-rest-api
|
|
var protocol string
|
|
switch strings.ToUpper(string(port.Protocol)) {
|
|
case "UDP":
|
|
protocol = "/udp"
|
|
case "TCP":
|
|
protocol = "/tcp"
|
|
default:
|
|
glog.Warningf("Unknown protocol %q: defaulting to TCP", port.Protocol)
|
|
protocol = "/tcp"
|
|
}
|
|
|
|
dockerPort := dockernat.Port(strconv.Itoa(interiorPort) + protocol)
|
|
exposedPorts[dockerPort] = struct{}{}
|
|
|
|
hostBinding := dockernat.PortBinding{
|
|
HostPort: strconv.Itoa(exteriorPort),
|
|
HostIP: port.HostIP,
|
|
}
|
|
|
|
// Allow multiple host ports bind to same docker port
|
|
if existedBindings, ok := portBindings[dockerPort]; ok {
|
|
// If a docker port already map to a host port, just append the host ports
|
|
portBindings[dockerPort] = append(existedBindings, hostBinding)
|
|
} else {
|
|
// Otherwise, it's fresh new port binding
|
|
portBindings[dockerPort] = []dockernat.PortBinding{
|
|
hostBinding,
|
|
}
|
|
}
|
|
}
|
|
return exposedPorts, portBindings
|
|
}
|
|
|
|
func (dm *DockerManager) runContainer(
|
|
pod *api.Pod,
|
|
container *api.Container,
|
|
opts *kubecontainer.RunContainerOptions,
|
|
ref *api.ObjectReference,
|
|
netMode string,
|
|
ipcMode string,
|
|
utsMode string,
|
|
pidMode string,
|
|
restartCount int,
|
|
oomScoreAdj int) (kubecontainer.ContainerID, error) {
|
|
|
|
dockerName := KubeletContainerName{
|
|
PodFullName: kubecontainer.GetPodFullName(pod),
|
|
PodUID: pod.UID,
|
|
ContainerName: container.Name,
|
|
}
|
|
|
|
securityOpts, err := dm.getSecurityOpts(pod, container.Name)
|
|
if err != nil {
|
|
return kubecontainer.ContainerID{}, err
|
|
}
|
|
fmtSecurityOpts, err := dm.fmtDockerOpts(securityOpts)
|
|
if err != nil {
|
|
return kubecontainer.ContainerID{}, err
|
|
}
|
|
|
|
// Pod information is recorded on the container as labels to preserve it in the event the pod is deleted
|
|
// while the Kubelet is down and there is no information available to recover the pod.
|
|
// TODO: keep these labels up to date if the pod changes
|
|
labels := newLabels(container, pod, restartCount, dm.enableCustomMetrics)
|
|
|
|
// TODO(random-liu): Remove this when we start to use new labels for KillContainerInPod
|
|
if container.Lifecycle != nil && container.Lifecycle.PreStop != nil {
|
|
// TODO: This is kind of hacky, we should really just encode the bits we need.
|
|
// TODO: This is hacky because the Kubelet should be parameterized to encode a specific version
|
|
// and needs to be able to migrate this whenever we deprecate v1. Should be a member of DockerManager.
|
|
if data, err := runtime.Encode(api.Codecs.LegacyCodec(unversioned.GroupVersion{Group: api.GroupName, Version: "v1"}), pod); err == nil {
|
|
labels[kubernetesPodLabel] = string(data)
|
|
} else {
|
|
glog.Errorf("Failed to encode pod: %s for prestop hook", pod.Name)
|
|
}
|
|
}
|
|
memoryLimit := container.Resources.Limits.Memory().Value()
|
|
cpuRequest := container.Resources.Requests.Cpu()
|
|
cpuLimit := container.Resources.Limits.Cpu()
|
|
nvidiaGPULimit := container.Resources.Limits.NvidiaGPU()
|
|
var cpuShares int64
|
|
// If request is not specified, but limit is, we want request to default to limit.
|
|
// API server does this for new containers, but we repeat this logic in Kubelet
|
|
// for containers running on existing Kubernetes clusters.
|
|
if cpuRequest.IsZero() && !cpuLimit.IsZero() {
|
|
cpuShares = milliCPUToShares(cpuLimit.MilliValue())
|
|
} else {
|
|
// if cpuRequest.Amount is nil, then milliCPUToShares will return the minimal number
|
|
// of CPU shares.
|
|
cpuShares = milliCPUToShares(cpuRequest.MilliValue())
|
|
}
|
|
var devices []dockercontainer.DeviceMapping
|
|
if nvidiaGPULimit.Value() != 0 {
|
|
// Experimental. For now, we hardcode /dev/nvidia0 no matter what the user asks for
|
|
// (we only support one device per node).
|
|
devices = []dockercontainer.DeviceMapping{
|
|
{PathOnHost: "/dev/nvidia0", PathInContainer: "/dev/nvidia0", CgroupPermissions: "mrw"},
|
|
{PathOnHost: "/dev/nvidiactl", PathInContainer: "/dev/nvidiactl", CgroupPermissions: "mrw"},
|
|
{PathOnHost: "/dev/nvidia-uvm", PathInContainer: "/dev/nvidia-uvm", CgroupPermissions: "mrw"},
|
|
}
|
|
}
|
|
binds := makeMountBindings(opts.Mounts)
|
|
// The reason we create and mount the log file in here (not in kubelet) is because
|
|
// the file's location depends on the ID of the container, and we need to create and
|
|
// mount the file before actually starting the container.
|
|
// TODO(yifan): Consider to pull this logic out since we might need to reuse it in
|
|
// other container runtime.
|
|
_, containerName, cid := BuildDockerName(dockerName, container)
|
|
if opts.PodContainerDir != "" && len(container.TerminationMessagePath) != 0 {
|
|
// Because the PodContainerDir contains pod uid and container name which is unique enough,
|
|
// here we just add a unique container id to make the path unique for different instances
|
|
// of the same container.
|
|
containerLogPath := path.Join(opts.PodContainerDir, cid)
|
|
fs, err := os.Create(containerLogPath)
|
|
if err != nil {
|
|
// TODO: Clean up the previously created dir? return the error?
|
|
glog.Errorf("Error on creating termination-log file %q: %v", containerLogPath, err)
|
|
} else {
|
|
fs.Close() // Close immediately; we're just doing a `touch` here
|
|
b := fmt.Sprintf("%s:%s", containerLogPath, container.TerminationMessagePath)
|
|
|
|
// Have docker relabel the termination log path if SELinux is
|
|
// enabled.
|
|
if selinux.SELinuxEnabled() {
|
|
b += ":Z"
|
|
}
|
|
|
|
binds = append(binds, b)
|
|
}
|
|
}
|
|
|
|
hc := &dockercontainer.HostConfig{
|
|
Binds: binds,
|
|
NetworkMode: dockercontainer.NetworkMode(netMode),
|
|
IpcMode: dockercontainer.IpcMode(ipcMode),
|
|
UTSMode: dockercontainer.UTSMode(utsMode),
|
|
PidMode: dockercontainer.PidMode(pidMode),
|
|
ReadonlyRootfs: readOnlyRootFilesystem(container),
|
|
Resources: dockercontainer.Resources{
|
|
Memory: memoryLimit,
|
|
MemorySwap: -1,
|
|
CPUShares: cpuShares,
|
|
Devices: devices,
|
|
},
|
|
SecurityOpt: fmtSecurityOpts,
|
|
}
|
|
|
|
// Set sysctls if requested
|
|
if container.Name == PodInfraContainerName {
|
|
sysctls, unsafeSysctls, err := api.SysctlsFromPodAnnotations(pod.Annotations)
|
|
if err != nil {
|
|
dm.recorder.Eventf(ref, api.EventTypeWarning, events.FailedToCreateContainer, "Failed to create docker container %q of pod %q with error: %v", container.Name, format.Pod(pod), err)
|
|
return kubecontainer.ContainerID{}, err
|
|
}
|
|
if len(sysctls)+len(unsafeSysctls) > 0 {
|
|
hc.Sysctls = make(map[string]string, len(sysctls)+len(unsafeSysctls))
|
|
for _, c := range sysctls {
|
|
hc.Sysctls[c.Name] = c.Value
|
|
}
|
|
for _, c := range unsafeSysctls {
|
|
hc.Sysctls[c.Name] = c.Value
|
|
}
|
|
}
|
|
}
|
|
|
|
// If current api version is newer than docker 1.10 requested, set OomScoreAdj to HostConfig
|
|
result, err := dm.checkDockerAPIVersion(dockerV110APIVersion)
|
|
if err != nil {
|
|
glog.Errorf("Failed to check docker api version: %v", err)
|
|
} else if result >= 0 {
|
|
hc.OomScoreAdj = oomScoreAdj
|
|
}
|
|
|
|
if dm.cpuCFSQuota {
|
|
// if cpuLimit.Amount is nil, then the appropriate default value is returned to allow full usage of cpu resource.
|
|
cpuQuota, cpuPeriod := milliCPUToQuota(cpuLimit.MilliValue())
|
|
|
|
hc.CPUQuota = cpuQuota
|
|
hc.CPUPeriod = cpuPeriod
|
|
}
|
|
|
|
if len(opts.CgroupParent) > 0 {
|
|
hc.CgroupParent = opts.CgroupParent
|
|
}
|
|
|
|
dockerOpts := dockertypes.ContainerCreateConfig{
|
|
Name: containerName,
|
|
Config: &dockercontainer.Config{
|
|
Env: makeEnvList(opts.Envs),
|
|
Image: container.Image,
|
|
WorkingDir: container.WorkingDir,
|
|
Labels: labels,
|
|
// Interactive containers:
|
|
OpenStdin: container.Stdin,
|
|
StdinOnce: container.StdinOnce,
|
|
Tty: container.TTY,
|
|
},
|
|
HostConfig: hc,
|
|
}
|
|
|
|
// Set network configuration for infra-container
|
|
if container.Name == PodInfraContainerName {
|
|
setInfraContainerNetworkConfig(pod, netMode, opts, &dockerOpts)
|
|
}
|
|
|
|
setEntrypointAndCommand(container, opts, dockerOpts)
|
|
|
|
glog.V(3).Infof("Container %v/%v/%v: setting entrypoint \"%v\" and command \"%v\"", pod.Namespace, pod.Name, container.Name, dockerOpts.Config.Entrypoint, dockerOpts.Config.Cmd)
|
|
|
|
supplementalGids := dm.runtimeHelper.GetExtraSupplementalGroupsForPod(pod)
|
|
securityContextProvider := securitycontext.NewSimpleSecurityContextProvider()
|
|
securityContextProvider.ModifyContainerConfig(pod, container, dockerOpts.Config)
|
|
securityContextProvider.ModifyHostConfig(pod, container, dockerOpts.HostConfig, supplementalGids)
|
|
createResp, err := dm.client.CreateContainer(dockerOpts)
|
|
if err != nil {
|
|
dm.recorder.Eventf(ref, api.EventTypeWarning, events.FailedToCreateContainer, "Failed to create docker container %q of pod %q with error: %v", container.Name, format.Pod(pod), err)
|
|
return kubecontainer.ContainerID{}, err
|
|
}
|
|
if len(createResp.Warnings) != 0 {
|
|
glog.V(2).Infof("Container %q of pod %q created with warnings: %v", container.Name, format.Pod(pod), createResp.Warnings)
|
|
}
|
|
|
|
createdEventMsg := fmt.Sprintf("Created container with docker id %v", utilstrings.ShortenString(createResp.ID, 12))
|
|
if len(securityOpts) > 0 {
|
|
var msgs []string
|
|
for _, opt := range securityOpts {
|
|
glog.Errorf("Logging security options: %+v", opt)
|
|
msg := opt.msg
|
|
if msg == "" {
|
|
msg = opt.value
|
|
}
|
|
msgs = append(msgs, fmt.Sprintf("%s=%s", opt.key, truncateMsg(msg, 256)))
|
|
}
|
|
createdEventMsg = fmt.Sprintf("%s; Security:[%s]", createdEventMsg, strings.Join(msgs, " "))
|
|
}
|
|
dm.recorder.Eventf(ref, api.EventTypeNormal, events.CreatedContainer, createdEventMsg)
|
|
|
|
if err = dm.client.StartContainer(createResp.ID); err != nil {
|
|
dm.recorder.Eventf(ref, api.EventTypeWarning, events.FailedToStartContainer,
|
|
"Failed to start container with docker id %v with error: %v", utilstrings.ShortenString(createResp.ID, 12), err)
|
|
return kubecontainer.ContainerID{}, err
|
|
}
|
|
dm.recorder.Eventf(ref, api.EventTypeNormal, events.StartedContainer, "Started container with docker id %v", utilstrings.ShortenString(createResp.ID, 12))
|
|
|
|
return kubecontainer.DockerID(createResp.ID).ContainerID(), nil
|
|
}
|
|
|
|
// setInfraContainerNetworkConfig sets the network configuration for the infra-container. We only set network configuration for infra-container, all
|
|
// the user containers will share the same network namespace with infra-container.
|
|
func setInfraContainerNetworkConfig(pod *api.Pod, netMode string, opts *kubecontainer.RunContainerOptions, dockerOpts *dockertypes.ContainerCreateConfig) {
|
|
exposedPorts, portBindings := makePortsAndBindings(opts.PortMappings)
|
|
dockerOpts.Config.ExposedPorts = exposedPorts
|
|
dockerOpts.HostConfig.PortBindings = dockernat.PortMap(portBindings)
|
|
|
|
if netMode != namespaceModeHost {
|
|
dockerOpts.Config.Hostname = opts.Hostname
|
|
if len(opts.DNS) > 0 {
|
|
dockerOpts.HostConfig.DNS = opts.DNS
|
|
}
|
|
if len(opts.DNSSearch) > 0 {
|
|
dockerOpts.HostConfig.DNSSearch = opts.DNSSearch
|
|
}
|
|
}
|
|
}
|
|
|
|
func setEntrypointAndCommand(container *api.Container, opts *kubecontainer.RunContainerOptions, dockerOpts dockertypes.ContainerCreateConfig) {
|
|
command, args := kubecontainer.ExpandContainerCommandAndArgs(container, opts.Envs)
|
|
|
|
dockerOpts.Config.Entrypoint = dockerstrslice.StrSlice(command)
|
|
dockerOpts.Config.Cmd = dockerstrslice.StrSlice(args)
|
|
}
|
|
|
|
// A helper function to get the KubeletContainerName and hash from a docker
|
|
// container.
|
|
func getDockerContainerNameInfo(c *dockertypes.Container) (*KubeletContainerName, uint64, error) {
|
|
if len(c.Names) == 0 {
|
|
return nil, 0, fmt.Errorf("cannot parse empty docker container name: %#v", c.Names)
|
|
}
|
|
dockerName, hash, err := ParseDockerName(c.Names[0])
|
|
if err != nil {
|
|
return nil, 0, fmt.Errorf("parse docker container name %q error: %v", c.Names[0], err)
|
|
}
|
|
return dockerName, hash, nil
|
|
}
|
|
|
|
// Get pod UID, name, and namespace by examining the container names.
|
|
func getPodInfoFromContainer(c *dockertypes.Container) (kubetypes.UID, string, string, error) {
|
|
dockerName, _, err := getDockerContainerNameInfo(c)
|
|
if err != nil {
|
|
return kubetypes.UID(""), "", "", err
|
|
}
|
|
name, namespace, err := kubecontainer.ParsePodFullName(dockerName.PodFullName)
|
|
if err != nil {
|
|
return kubetypes.UID(""), "", "", fmt.Errorf("parse pod full name %q error: %v", dockerName.PodFullName, err)
|
|
}
|
|
return dockerName.PodUID, name, namespace, nil
|
|
}
|
|
|
|
// GetContainers returns a list of running containers if |all| is false;
|
|
// otherwise, it returns all containers.
|
|
func (dm *DockerManager) GetContainers(all bool) ([]*kubecontainer.Container, error) {
|
|
containers, err := GetKubeletDockerContainers(dm.client, all)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// Convert DockerContainers to []*kubecontainer.Container
|
|
result := make([]*kubecontainer.Container, 0, len(containers))
|
|
for _, c := range containers {
|
|
converted, err := toRuntimeContainer(c)
|
|
if err != nil {
|
|
glog.Errorf("Error examining the container %v: %v", c.ID, err)
|
|
continue
|
|
}
|
|
result = append(result, converted)
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
func (dm *DockerManager) GetPods(all bool) ([]*kubecontainer.Pod, error) {
|
|
start := time.Now()
|
|
defer func() {
|
|
metrics.ContainerManagerLatency.WithLabelValues("GetPods").Observe(metrics.SinceInMicroseconds(start))
|
|
}()
|
|
pods := make(map[kubetypes.UID]*kubecontainer.Pod)
|
|
var result []*kubecontainer.Pod
|
|
|
|
containers, err := GetKubeletDockerContainers(dm.client, all)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Group containers by pod.
|
|
for _, c := range containers {
|
|
converted, err := toRuntimeContainer(c)
|
|
if err != nil {
|
|
glog.Errorf("Error examining the container %v: %v", c.ID, err)
|
|
continue
|
|
}
|
|
|
|
podUID, podName, podNamespace, err := getPodInfoFromContainer(c)
|
|
if err != nil {
|
|
glog.Errorf("Error examining the container %v: %v", c.ID, err)
|
|
continue
|
|
}
|
|
|
|
pod, found := pods[podUID]
|
|
if !found {
|
|
pod = &kubecontainer.Pod{
|
|
ID: podUID,
|
|
Name: podName,
|
|
Namespace: podNamespace,
|
|
}
|
|
pods[podUID] = pod
|
|
}
|
|
pod.Containers = append(pod.Containers, converted)
|
|
}
|
|
|
|
// Convert map to list.
|
|
for _, p := range pods {
|
|
result = append(result, p)
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
// List all images in the local storage.
|
|
func (dm *DockerManager) ListImages() ([]kubecontainer.Image, error) {
|
|
var images []kubecontainer.Image
|
|
|
|
dockerImages, err := dm.client.ListImages(dockertypes.ImageListOptions{})
|
|
if err != nil {
|
|
return images, err
|
|
}
|
|
|
|
for _, di := range dockerImages {
|
|
image, err := toRuntimeImage(&di)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
images = append(images, *image)
|
|
}
|
|
return images, nil
|
|
}
|
|
|
|
// PullImage pulls an image from network to local storage.
|
|
func (dm *DockerManager) PullImage(image kubecontainer.ImageSpec, secrets []api.Secret) error {
|
|
return dm.dockerPuller.Pull(image.Image, secrets)
|
|
}
|
|
|
|
// IsImagePresent checks whether the container image is already in the local storage.
|
|
func (dm *DockerManager) IsImagePresent(image kubecontainer.ImageSpec) (bool, error) {
|
|
return dm.dockerPuller.IsImagePresent(image.Image)
|
|
}
|
|
|
|
// Removes the specified image.
|
|
func (dm *DockerManager) RemoveImage(image kubecontainer.ImageSpec) error {
|
|
// If the image has multiple tags, we need to remove all the tags
|
|
if inspectImage, err := dm.client.InspectImageByID(image.Image); err == nil && len(inspectImage.RepoTags) > 1 {
|
|
for _, tag := range inspectImage.RepoTags {
|
|
if _, err := dm.client.RemoveImage(tag, dockertypes.ImageRemoveOptions{PruneChildren: true}); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
_, err := dm.client.RemoveImage(image.Image, dockertypes.ImageRemoveOptions{PruneChildren: true})
|
|
return err
|
|
}
|
|
|
|
// podInfraContainerChanged returns true if the pod infra container has changed.
|
|
func (dm *DockerManager) podInfraContainerChanged(pod *api.Pod, podInfraContainerStatus *kubecontainer.ContainerStatus) (bool, error) {
|
|
var ports []api.ContainerPort
|
|
|
|
// Check network mode.
|
|
if kubecontainer.IsHostNetworkPod(pod) {
|
|
dockerPodInfraContainer, err := dm.client.InspectContainer(podInfraContainerStatus.ID.ID)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
|
|
networkMode := getDockerNetworkMode(dockerPodInfraContainer)
|
|
if networkMode != namespaceModeHost {
|
|
glog.V(4).Infof("host: %v, %v", pod.Spec.SecurityContext.HostNetwork, networkMode)
|
|
return true, nil
|
|
}
|
|
} else if dm.networkPlugin.Name() != "cni" && dm.networkPlugin.Name() != "kubenet" {
|
|
// Docker only exports ports from the pod infra container. Let's
|
|
// collect all of the relevant ports and export them.
|
|
for _, container := range pod.Spec.InitContainers {
|
|
ports = append(ports, container.Ports...)
|
|
}
|
|
for _, container := range pod.Spec.Containers {
|
|
ports = append(ports, container.Ports...)
|
|
}
|
|
}
|
|
expectedPodInfraContainer := &api.Container{
|
|
Name: PodInfraContainerName,
|
|
Image: dm.podInfraContainerImage,
|
|
Ports: ports,
|
|
ImagePullPolicy: podInfraContainerImagePullPolicy,
|
|
Env: dm.podInfraContainerEnv,
|
|
}
|
|
return podInfraContainerStatus.Hash != kubecontainer.HashContainer(expectedPodInfraContainer), nil
|
|
}
|
|
|
|
// determine if the container root should be a read only filesystem.
|
|
func readOnlyRootFilesystem(container *api.Container) bool {
|
|
return container.SecurityContext != nil && container.SecurityContext.ReadOnlyRootFilesystem != nil && *container.SecurityContext.ReadOnlyRootFilesystem
|
|
}
|
|
|
|
// container must not be nil
|
|
func getDockerNetworkMode(container *dockertypes.ContainerJSON) string {
|
|
if container.HostConfig != nil {
|
|
return string(container.HostConfig.NetworkMode)
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// dockerVersion implements kubecontainer.Version interface by implementing
|
|
// Compare() and String() (which is implemented by the underlying semver.Version)
|
|
// TODO: this code is the same as rktVersion and may make sense to be moved to
|
|
// somewhere shared.
|
|
type dockerVersion struct {
|
|
*semver.Version
|
|
}
|
|
|
|
// newDockerVersion returns a semantically versioned docker version value
|
|
func newDockerVersion(version string) (dockerVersion, error) {
|
|
sem, err := semver.NewVersion(version)
|
|
return dockerVersion{sem}, err
|
|
}
|
|
|
|
func (r dockerVersion) String() string {
|
|
return r.Version.String()
|
|
}
|
|
|
|
func (r dockerVersion) Compare(other string) (int, error) {
|
|
v, err := newDockerVersion(other)
|
|
if err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
if r.LessThan(*v.Version) {
|
|
return -1, nil
|
|
}
|
|
if v.Version.LessThan(*r.Version) {
|
|
return 1, nil
|
|
}
|
|
return 0, nil
|
|
}
|
|
|
|
// apiVersion implements kubecontainer.Version interface by implementing
|
|
// Compare() and String(). It uses the compare function of engine-api to
|
|
// compare docker apiversions.
|
|
type apiVersion string
|
|
|
|
func (v apiVersion) String() string {
|
|
return string(v)
|
|
}
|
|
|
|
func (v apiVersion) Compare(other string) (int, error) {
|
|
if dockerapiversion.LessThan(string(v), other) {
|
|
return -1, nil
|
|
} else if dockerapiversion.GreaterThan(string(v), other) {
|
|
return 1, nil
|
|
}
|
|
return 0, nil
|
|
}
|
|
|
|
func (dm *DockerManager) Type() string {
|
|
return DockerType
|
|
}
|
|
|
|
func (dm *DockerManager) Version() (kubecontainer.Version, error) {
|
|
v, err := dm.client.Version()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("docker: failed to get docker version: %v", err)
|
|
}
|
|
version, err := newDockerVersion(v.Version)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("docker: failed to parse docker version %q: %v", v.Version, err)
|
|
}
|
|
return version, nil
|
|
}
|
|
|
|
func (dm *DockerManager) APIVersion() (kubecontainer.Version, error) {
|
|
v, err := dm.client.Version()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("docker: failed to get docker version: %v", err)
|
|
}
|
|
|
|
return apiVersion(v.APIVersion), nil
|
|
}
|
|
|
|
// Status returns error if docker daemon is unhealthy, nil otherwise.
|
|
// Now we do this by checking whether:
|
|
// 1) `docker version` works
|
|
// 2) docker version is compatible with minimum requirement
|
|
func (dm *DockerManager) Status() error {
|
|
return dm.checkVersionCompatibility()
|
|
}
|
|
|
|
func (dm *DockerManager) checkVersionCompatibility() error {
|
|
version, err := dm.APIVersion()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Verify the docker version.
|
|
result, err := version.Compare(minimumDockerAPIVersion)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to compare current docker version %v with minimum support Docker version %q - %v", version, minimumDockerAPIVersion, err)
|
|
}
|
|
if result < 0 {
|
|
return fmt.Errorf("container runtime version is older than %s", minimumDockerAPIVersion)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (dm *DockerManager) fmtDockerOpts(opts []dockerOpt) ([]string, error) {
|
|
version, err := dm.APIVersion()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
const (
|
|
// Docker changed the API for specifying options in v1.11
|
|
optSeparatorChangeVersion = "1.23" // Corresponds to docker 1.11.x
|
|
optSeparatorOld = ':'
|
|
optSeparatorNew = '='
|
|
)
|
|
|
|
sep := optSeparatorNew
|
|
if result, err := version.Compare(optSeparatorChangeVersion); err != nil {
|
|
return nil, fmt.Errorf("error parsing docker API version: %v", err)
|
|
} else if result < 0 {
|
|
sep = optSeparatorOld
|
|
}
|
|
|
|
fmtOpts := make([]string, len(opts))
|
|
for i, opt := range opts {
|
|
fmtOpts[i] = fmt.Sprintf("%s%c%s", opt.key, sep, opt.value)
|
|
}
|
|
return fmtOpts, nil
|
|
}
|
|
|
|
func (dm *DockerManager) getSecurityOpts(pod *api.Pod, ctrName string) ([]dockerOpt, error) {
|
|
var securityOpts []dockerOpt
|
|
if seccompOpts, err := dm.getSeccompOpts(pod, ctrName); err != nil {
|
|
return nil, err
|
|
} else {
|
|
securityOpts = append(securityOpts, seccompOpts...)
|
|
}
|
|
|
|
if appArmorOpts, err := dm.getAppArmorOpts(pod, ctrName); err != nil {
|
|
return nil, err
|
|
} else {
|
|
securityOpts = append(securityOpts, appArmorOpts...)
|
|
}
|
|
|
|
return securityOpts, nil
|
|
}
|
|
|
|
type dockerOpt struct {
|
|
// The key-value pair passed to docker.
|
|
key, value string
|
|
// The alternative value to use in log/event messages.
|
|
msg string
|
|
}
|
|
|
|
// Expose key/value from dockertools
|
|
func (d dockerOpt) GetKV() (string, string) {
|
|
return d.key, d.value
|
|
}
|
|
|
|
// Get the docker security options for seccomp.
|
|
func (dm *DockerManager) getSeccompOpts(pod *api.Pod, ctrName string) ([]dockerOpt, error) {
|
|
version, err := dm.APIVersion()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// seccomp is only on docker versions >= v1.10
|
|
if result, err := version.Compare(dockerV110APIVersion); err != nil {
|
|
return nil, err
|
|
} else if result < 0 {
|
|
return nil, nil // return early for Docker < 1.10
|
|
}
|
|
|
|
return GetSeccompOpts(pod.ObjectMeta.Annotations, ctrName, dm.seccompProfileRoot)
|
|
}
|
|
|
|
// Temporarily export this function to share with dockershim.
|
|
// TODO: clean this up.
|
|
func GetSeccompOpts(annotations map[string]string, ctrName, profileRoot string) ([]dockerOpt, error) {
|
|
profile, profileOK := annotations[api.SeccompContainerAnnotationKeyPrefix+ctrName]
|
|
if !profileOK {
|
|
// try the pod profile
|
|
profile, profileOK = annotations[api.SeccompPodAnnotationKey]
|
|
if !profileOK {
|
|
// return early the default
|
|
return defaultSeccompOpt, nil
|
|
}
|
|
}
|
|
|
|
if profile == "unconfined" {
|
|
// return early the default
|
|
return defaultSeccompOpt, nil
|
|
}
|
|
|
|
if profile == "docker/default" {
|
|
// return nil so docker will load the default seccomp profile
|
|
return nil, nil
|
|
}
|
|
|
|
if !strings.HasPrefix(profile, "localhost/") {
|
|
return nil, fmt.Errorf("unknown seccomp profile option: %s", profile)
|
|
}
|
|
|
|
name := strings.TrimPrefix(profile, "localhost/") // by pod annotation validation, name is a valid subpath
|
|
fname := filepath.Join(profileRoot, filepath.FromSlash(name))
|
|
file, err := ioutil.ReadFile(fname)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot load seccomp profile %q: %v", name, err)
|
|
}
|
|
|
|
b := bytes.NewBuffer(nil)
|
|
if err := json.Compact(b, file); err != nil {
|
|
return nil, err
|
|
}
|
|
// Rather than the full profile, just put the filename & md5sum in the event log.
|
|
msg := fmt.Sprintf("%s(md5:%x)", name, md5.Sum(file))
|
|
|
|
return []dockerOpt{{"seccomp", b.String(), msg}}, nil
|
|
}
|
|
|
|
// Get the docker security options for AppArmor.
|
|
func (dm *DockerManager) getAppArmorOpts(pod *api.Pod, ctrName string) ([]dockerOpt, error) {
|
|
return GetAppArmorOpts(pod.Annotations, ctrName)
|
|
}
|
|
|
|
// Temporarily export this function to share with dockershim.
|
|
// TODO: clean this up.
|
|
func GetAppArmorOpts(annotations map[string]string, ctrName string) ([]dockerOpt, error) {
|
|
profile := apparmor.GetProfileNameFromPodAnnotations(annotations, ctrName)
|
|
if profile == "" || profile == apparmor.ProfileRuntimeDefault {
|
|
// The docker applies the default profile by default.
|
|
return nil, nil
|
|
}
|
|
|
|
// Assume validation has already happened.
|
|
profileName := strings.TrimPrefix(profile, apparmor.ProfileNamePrefix)
|
|
return []dockerOpt{{"apparmor", profileName, ""}}, nil
|
|
}
|
|
|
|
type dockerExitError struct {
|
|
Inspect *dockertypes.ContainerExecInspect
|
|
}
|
|
|
|
func (d *dockerExitError) String() string {
|
|
return d.Error()
|
|
}
|
|
|
|
func (d *dockerExitError) Error() string {
|
|
return fmt.Sprintf("Error executing in Docker Container: %d", d.Inspect.ExitCode)
|
|
}
|
|
|
|
func (d *dockerExitError) Exited() bool {
|
|
return !d.Inspect.Running
|
|
}
|
|
|
|
func (d *dockerExitError) ExitStatus() int {
|
|
return d.Inspect.ExitCode
|
|
}
|
|
|
|
// ExecInContainer runs the command inside the container identified by containerID.
|
|
func (dm *DockerManager) ExecInContainer(containerID kubecontainer.ContainerID, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan term.Size) error {
|
|
if dm.execHandler == nil {
|
|
return errors.New("unable to exec without an exec handler")
|
|
}
|
|
|
|
container, err := dm.client.InspectContainer(containerID.ID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !container.State.Running {
|
|
return fmt.Errorf("container not running (%s)", container.ID)
|
|
}
|
|
|
|
return dm.execHandler.ExecInContainer(dm.client, container, cmd, stdin, stdout, stderr, tty, resize)
|
|
}
|
|
|
|
func (dm *DockerManager) AttachContainer(containerID kubecontainer.ContainerID, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan term.Size) error {
|
|
return AttachContainer(dm.client, containerID.ID, stdin, stdout, stderr, tty, resize)
|
|
}
|
|
|
|
// Temporarily export this function to share with dockershim.
|
|
// TODO: clean this up.
|
|
func AttachContainer(client DockerInterface, containerID string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan term.Size) error {
|
|
// Have to start this before the call to client.AttachToContainer because client.AttachToContainer is a blocking
|
|
// call :-( Otherwise, resize events don't get processed and the terminal never resizes.
|
|
kubecontainer.HandleResizing(resize, func(size term.Size) {
|
|
client.ResizeContainerTTY(containerID, int(size.Height), int(size.Width))
|
|
})
|
|
|
|
// TODO(random-liu): Do we really use the *Logs* field here?
|
|
opts := dockertypes.ContainerAttachOptions{
|
|
Stream: true,
|
|
Stdin: stdin != nil,
|
|
Stdout: stdout != nil,
|
|
Stderr: stderr != nil,
|
|
}
|
|
sopts := StreamOptions{
|
|
InputStream: stdin,
|
|
OutputStream: stdout,
|
|
ErrorStream: stderr,
|
|
RawTerminal: tty,
|
|
}
|
|
return client.AttachToContainer(containerID, opts, sopts)
|
|
}
|
|
|
|
func noPodInfraContainerError(podName, podNamespace string) error {
|
|
return fmt.Errorf("cannot find pod infra container in pod %q", kubecontainer.BuildPodFullName(podName, podNamespace))
|
|
}
|
|
|
|
// PortForward executes socat in the pod's network namespace and copies
|
|
// data between stream (representing the user's local connection on their
|
|
// computer) and the specified port in the container.
|
|
//
|
|
// TODO:
|
|
// - match cgroups of container
|
|
// - should we support nsenter + socat on the host? (current impl)
|
|
// - should we support nsenter + socat in a container, running with elevated privs and --pid=host?
|
|
func (dm *DockerManager) PortForward(pod *kubecontainer.Pod, port uint16, stream io.ReadWriteCloser) error {
|
|
podInfraContainer := pod.FindContainerByName(PodInfraContainerName)
|
|
if podInfraContainer == nil {
|
|
return noPodInfraContainerError(pod.Name, pod.Namespace)
|
|
}
|
|
|
|
return PortForward(dm.client, podInfraContainer.ID.ID, port, stream)
|
|
}
|
|
|
|
// Temporarily export this function to share with dockershim.
|
|
func PortForward(client DockerInterface, podInfraContainerID string, port uint16, stream io.ReadWriteCloser) error {
|
|
container, err := client.InspectContainer(podInfraContainerID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !container.State.Running {
|
|
return fmt.Errorf("container not running (%s)", container.ID)
|
|
}
|
|
|
|
containerPid := container.State.Pid
|
|
socatPath, lookupErr := exec.LookPath("socat")
|
|
if lookupErr != nil {
|
|
return fmt.Errorf("unable to do port forwarding: socat not found.")
|
|
}
|
|
|
|
args := []string{"-t", fmt.Sprintf("%d", containerPid), "-n", socatPath, "-", fmt.Sprintf("TCP4:localhost:%d", port)}
|
|
|
|
nsenterPath, lookupErr := exec.LookPath("nsenter")
|
|
if lookupErr != nil {
|
|
return fmt.Errorf("unable to do port forwarding: nsenter not found.")
|
|
}
|
|
|
|
commandString := fmt.Sprintf("%s %s", nsenterPath, strings.Join(args, " "))
|
|
glog.V(4).Infof("executing port forwarding command: %s", commandString)
|
|
|
|
command := exec.Command(nsenterPath, args...)
|
|
command.Stdout = stream
|
|
|
|
stderr := new(bytes.Buffer)
|
|
command.Stderr = stderr
|
|
|
|
// If we use Stdin, command.Run() won't return until the goroutine that's copying
|
|
// from stream finishes. Unfortunately, if you have a client like telnet connected
|
|
// via port forwarding, as long as the user's telnet client is connected to the user's
|
|
// local listener that port forwarding sets up, the telnet session never exits. This
|
|
// means that even if socat has finished running, command.Run() won't ever return
|
|
// (because the client still has the connection and stream open).
|
|
//
|
|
// The work around is to use StdinPipe(), as Wait() (called by Run()) closes the pipe
|
|
// when the command (socat) exits.
|
|
inPipe, err := command.StdinPipe()
|
|
if err != nil {
|
|
return fmt.Errorf("unable to do port forwarding: error creating stdin pipe: %v", err)
|
|
}
|
|
go func() {
|
|
io.Copy(inPipe, stream)
|
|
inPipe.Close()
|
|
}()
|
|
|
|
if err := command.Run(); err != nil {
|
|
return fmt.Errorf("%v: %s", err, stderr.String())
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// TODO(random-liu): Change running pod to pod status in the future. We can't do it now, because kubelet also uses this function without pod status.
|
|
// We can only deprecate this after refactoring kubelet.
|
|
// TODO(random-liu): After using pod status for KillPod(), we can also remove the kubernetesPodLabel, because all the needed information should have
|
|
// been extract from new labels and stored in pod status.
|
|
// only hard eviction scenarios should provide a grace period override, all other code paths must pass nil.
|
|
func (dm *DockerManager) KillPod(pod *api.Pod, runningPod kubecontainer.Pod, gracePeriodOverride *int64) error {
|
|
result := dm.killPodWithSyncResult(pod, runningPod, gracePeriodOverride)
|
|
return result.Error()
|
|
}
|
|
|
|
// NOTE(random-liu): The pod passed in could be *nil* when kubelet restarted.
|
|
func (dm *DockerManager) killPodWithSyncResult(pod *api.Pod, runningPod kubecontainer.Pod, gracePeriodOverride *int64) (result kubecontainer.PodSyncResult) {
|
|
// Send the kills in parallel since they may take a long time.
|
|
// There may be len(runningPod.Containers) or len(runningPod.Containers)-1 of result in the channel
|
|
containerResults := make(chan *kubecontainer.SyncResult, len(runningPod.Containers))
|
|
wg := sync.WaitGroup{}
|
|
var (
|
|
networkContainer *kubecontainer.Container
|
|
networkSpec *api.Container
|
|
)
|
|
wg.Add(len(runningPod.Containers))
|
|
for _, container := range runningPod.Containers {
|
|
go func(container *kubecontainer.Container) {
|
|
defer utilruntime.HandleCrash()
|
|
defer wg.Done()
|
|
|
|
var containerSpec *api.Container
|
|
if pod != nil {
|
|
for i, c := range pod.Spec.Containers {
|
|
if c.Name == container.Name {
|
|
containerSpec = &pod.Spec.Containers[i]
|
|
break
|
|
}
|
|
}
|
|
if containerSpec == nil {
|
|
for i, c := range pod.Spec.InitContainers {
|
|
if c.Name == container.Name {
|
|
containerSpec = &pod.Spec.InitContainers[i]
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// TODO: Handle this without signaling the pod infra container to
|
|
// adapt to the generic container runtime.
|
|
if container.Name == PodInfraContainerName {
|
|
// Store the container runtime for later deletion.
|
|
// We do this so that PreStop handlers can run in the network namespace.
|
|
networkContainer = container
|
|
networkSpec = containerSpec
|
|
return
|
|
}
|
|
|
|
killContainerResult := kubecontainer.NewSyncResult(kubecontainer.KillContainer, container.Name)
|
|
err := dm.KillContainerInPod(container.ID, containerSpec, pod, "Need to kill pod.", gracePeriodOverride)
|
|
if err != nil {
|
|
killContainerResult.Fail(kubecontainer.ErrKillContainer, err.Error())
|
|
glog.Errorf("Failed to delete container %v: %v; Skipping pod %q", container.ID.ID, err, runningPod.ID)
|
|
}
|
|
containerResults <- killContainerResult
|
|
}(container)
|
|
}
|
|
wg.Wait()
|
|
close(containerResults)
|
|
for containerResult := range containerResults {
|
|
result.AddSyncResult(containerResult)
|
|
}
|
|
if networkContainer != nil {
|
|
ins, err := dm.client.InspectContainer(networkContainer.ID.ID)
|
|
if err != nil {
|
|
err = fmt.Errorf("Error inspecting container %v: %v", networkContainer.ID.ID, err)
|
|
glog.Error(err)
|
|
result.Fail(err)
|
|
return
|
|
}
|
|
if getDockerNetworkMode(ins) != namespaceModeHost {
|
|
teardownNetworkResult := kubecontainer.NewSyncResult(kubecontainer.TeardownNetwork, kubecontainer.BuildPodFullName(runningPod.Name, runningPod.Namespace))
|
|
result.AddSyncResult(teardownNetworkResult)
|
|
glog.V(3).Infof("Calling network plugin %s to tear down pod for %s", dm.networkPlugin.Name(), kubecontainer.BuildPodFullName(runningPod.Name, runningPod.Namespace))
|
|
if err := dm.networkPlugin.TearDownPod(runningPod.Namespace, runningPod.Name, networkContainer.ID); err != nil {
|
|
message := fmt.Sprintf("Failed to teardown network for pod %q using network plugins %q: %v", runningPod.ID, dm.networkPlugin.Name(), err)
|
|
teardownNetworkResult.Fail(kubecontainer.ErrTeardownNetwork, message)
|
|
glog.Error(message)
|
|
}
|
|
}
|
|
killContainerResult := kubecontainer.NewSyncResult(kubecontainer.KillContainer, networkContainer.Name)
|
|
result.AddSyncResult(killContainerResult)
|
|
if err := dm.KillContainerInPod(networkContainer.ID, networkSpec, pod, "Need to kill pod.", gracePeriodOverride); err != nil {
|
|
killContainerResult.Fail(kubecontainer.ErrKillContainer, err.Error())
|
|
glog.Errorf("Failed to delete container %v: %v; Skipping pod %q", networkContainer.ID.ID, err, runningPod.ID)
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// KillContainerInPod kills a container in the pod. It must be passed either a container ID or a container and pod,
|
|
// and will attempt to lookup the other information if missing.
|
|
func (dm *DockerManager) KillContainerInPod(containerID kubecontainer.ContainerID, container *api.Container, pod *api.Pod, message string, gracePeriodOverride *int64) error {
|
|
switch {
|
|
case containerID.IsEmpty():
|
|
// Locate the container.
|
|
pods, err := dm.GetPods(false)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
targetPod := kubecontainer.Pods(pods).FindPod(kubecontainer.GetPodFullName(pod), pod.UID)
|
|
targetContainer := targetPod.FindContainerByName(container.Name)
|
|
if targetContainer == nil {
|
|
return fmt.Errorf("unable to find container %q in pod %q", container.Name, targetPod.Name)
|
|
}
|
|
containerID = targetContainer.ID
|
|
|
|
case container == nil || pod == nil:
|
|
// Read information about the container from labels
|
|
inspect, err := dm.client.InspectContainer(containerID.ID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
storedPod, storedContainer, cerr := containerAndPodFromLabels(inspect)
|
|
if cerr != nil {
|
|
glog.Errorf("unable to access pod data from container: %v", cerr)
|
|
}
|
|
if container == nil {
|
|
container = storedContainer
|
|
}
|
|
if pod == nil {
|
|
pod = storedPod
|
|
}
|
|
}
|
|
return dm.killContainer(containerID, container, pod, message, gracePeriodOverride)
|
|
}
|
|
|
|
// killContainer accepts a containerID and an optional container or pod containing shutdown policies. Invoke
|
|
// KillContainerInPod if information must be retrieved first. It is only valid to provide a grace period override
|
|
// during hard eviction scenarios. All other code paths in kubelet must never provide a grace period override otherwise
|
|
// data corruption could occur in the end-user application.
|
|
func (dm *DockerManager) killContainer(containerID kubecontainer.ContainerID, container *api.Container, pod *api.Pod, reason string, gracePeriodOverride *int64) error {
|
|
ID := containerID.ID
|
|
name := ID
|
|
if container != nil {
|
|
name = fmt.Sprintf("%s %s", name, container.Name)
|
|
}
|
|
if pod != nil {
|
|
name = fmt.Sprintf("%s %s/%s", name, pod.Namespace, pod.Name)
|
|
}
|
|
|
|
gracePeriod := int64(minimumGracePeriodInSeconds)
|
|
if pod != nil {
|
|
switch {
|
|
case pod.DeletionGracePeriodSeconds != nil:
|
|
gracePeriod = *pod.DeletionGracePeriodSeconds
|
|
case pod.Spec.TerminationGracePeriodSeconds != nil:
|
|
gracePeriod = *pod.Spec.TerminationGracePeriodSeconds
|
|
}
|
|
}
|
|
glog.V(2).Infof("Killing container %q with %d second grace period", name, gracePeriod)
|
|
start := unversioned.Now()
|
|
|
|
if pod != nil && container != nil && container.Lifecycle != nil && container.Lifecycle.PreStop != nil {
|
|
glog.V(4).Infof("Running preStop hook for container %q", name)
|
|
done := make(chan struct{})
|
|
go func() {
|
|
defer close(done)
|
|
defer utilruntime.HandleCrash()
|
|
if msg, err := dm.runner.Run(containerID, pod, container, container.Lifecycle.PreStop); err != nil {
|
|
glog.Errorf("preStop hook for container %q failed: %v", name, err)
|
|
dm.generateFailedContainerEvent(containerID, pod.Name, events.FailedPreStopHook, msg)
|
|
}
|
|
}()
|
|
select {
|
|
case <-time.After(time.Duration(gracePeriod) * time.Second):
|
|
glog.Warningf("preStop hook for container %q did not complete in %d seconds", name, gracePeriod)
|
|
message := fmt.Sprintf("preStop hook for container %q did not complete in %d seconds", name, gracePeriod)
|
|
dm.generateFailedContainerEvent(containerID, pod.Name, events.UnfinishedPreStopHook, message)
|
|
case <-done:
|
|
glog.V(4).Infof("preStop hook for container %q completed", name)
|
|
}
|
|
gracePeriod -= int64(unversioned.Now().Sub(start.Time).Seconds())
|
|
}
|
|
|
|
// if the caller did not specify a grace period override, we ensure that the grace period
|
|
// is not less than the minimal shutdown window to avoid unnecessary SIGKILLs. if a caller
|
|
// did provide an override, we always set the gracePeriod to that value. the only valid
|
|
// time to send an override is during eviction scenarios where we want to do a hard kill of
|
|
// a container because of resource exhaustion for incompressible resources (i.e. disk, memory).
|
|
if gracePeriodOverride == nil {
|
|
if gracePeriod < minimumGracePeriodInSeconds {
|
|
gracePeriod = minimumGracePeriodInSeconds
|
|
}
|
|
} else {
|
|
gracePeriod = *gracePeriodOverride
|
|
glog.V(2).Infof("Killing container %q, but using %d second grace period override", name, gracePeriod)
|
|
}
|
|
|
|
err := dm.client.StopContainer(ID, int(gracePeriod))
|
|
if err == nil {
|
|
glog.V(2).Infof("Container %q exited after %s", name, unversioned.Now().Sub(start.Time))
|
|
} else {
|
|
glog.Warningf("Container %q termination failed after %s: %v", name, unversioned.Now().Sub(start.Time), err)
|
|
}
|
|
ref, ok := dm.containerRefManager.GetRef(containerID)
|
|
if !ok {
|
|
glog.Warningf("No ref for pod '%q'", name)
|
|
} else {
|
|
message := fmt.Sprintf("Killing container with docker id %v", utilstrings.ShortenString(ID, 12))
|
|
if reason != "" {
|
|
message = fmt.Sprint(message, ": ", reason)
|
|
}
|
|
dm.recorder.Event(ref, api.EventTypeNormal, events.KillingContainer, message)
|
|
dm.containerRefManager.ClearRef(containerID)
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (dm *DockerManager) generateFailedContainerEvent(containerID kubecontainer.ContainerID, podName, reason, message string) {
|
|
ref, ok := dm.containerRefManager.GetRef(containerID)
|
|
if !ok {
|
|
glog.Warningf("No ref for pod '%q'", podName)
|
|
return
|
|
}
|
|
dm.recorder.Event(ref, api.EventTypeWarning, reason, message)
|
|
}
|
|
|
|
var errNoPodOnContainer = fmt.Errorf("no pod information labels on Docker container")
|
|
|
|
// containerAndPodFromLabels tries to load the appropriate container info off of a Docker container's labels
|
|
func containerAndPodFromLabels(inspect *dockertypes.ContainerJSON) (pod *api.Pod, container *api.Container, err error) {
|
|
if inspect == nil || inspect.Config == nil || inspect.Config.Labels == nil {
|
|
return nil, nil, errNoPodOnContainer
|
|
}
|
|
labels := inspect.Config.Labels
|
|
|
|
// the pod data may not be set
|
|
if body, found := labels[kubernetesPodLabel]; found {
|
|
pod = &api.Pod{}
|
|
if err = runtime.DecodeInto(api.Codecs.UniversalDecoder(), []byte(body), pod); err == nil {
|
|
name := labels[types.KubernetesContainerNameLabel]
|
|
for ix := range pod.Spec.Containers {
|
|
if pod.Spec.Containers[ix].Name == name {
|
|
container = &pod.Spec.Containers[ix]
|
|
break
|
|
}
|
|
}
|
|
if container == nil {
|
|
for ix := range pod.Spec.InitContainers {
|
|
if pod.Spec.InitContainers[ix].Name == name {
|
|
container = &pod.Spec.InitContainers[ix]
|
|
break
|
|
}
|
|
}
|
|
}
|
|
if container == nil {
|
|
err = fmt.Errorf("unable to find container %s in pod %v", name, pod)
|
|
}
|
|
} else {
|
|
pod = nil
|
|
}
|
|
}
|
|
|
|
// attempt to find the default grace period if we didn't commit a pod, but set the generic metadata
|
|
// field (the one used by kill)
|
|
if pod == nil {
|
|
if period, ok := labels[kubernetesPodTerminationGracePeriodLabel]; ok {
|
|
if seconds, err := strconv.ParseInt(period, 10, 64); err == nil {
|
|
pod = &api.Pod{}
|
|
pod.DeletionGracePeriodSeconds = &seconds
|
|
}
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (dm *DockerManager) applyOOMScoreAdj(pod *api.Pod, container *api.Container, containerInfo *dockertypes.ContainerJSON) error {
|
|
if containerInfo.State.Pid == 0 {
|
|
// Container exited. We cannot do anything about it. Ignore this error.
|
|
glog.V(2).Infof("Failed to apply OOM score adj on container %q with ID %q. Init process does not exist.", containerInfo.Name, containerInfo.ID)
|
|
return nil
|
|
}
|
|
|
|
cgroupName, err := dm.procFs.GetFullContainerName(containerInfo.State.Pid)
|
|
if err != nil {
|
|
if err == os.ErrNotExist {
|
|
// Container exited. We cannot do anything about it. Ignore this error.
|
|
glog.V(2).Infof("Failed to apply OOM score adj on container %q with ID %q. Init process does not exist.", containerInfo.Name, containerInfo.ID)
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
oomScoreAdj := dm.calculateOomScoreAdj(pod, container)
|
|
if err = dm.oomAdjuster.ApplyOOMScoreAdjContainer(cgroupName, oomScoreAdj, 5); err != nil {
|
|
if err == os.ErrNotExist {
|
|
// Container exited. We cannot do anything about it. Ignore this error.
|
|
glog.V(2).Infof("Failed to apply OOM score adj on container %q with ID %q. Init process does not exist.", containerInfo.Name, containerInfo.ID)
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Run a single container from a pod. Returns the docker container ID
|
|
// If do not need to pass labels, just pass nil.
|
|
func (dm *DockerManager) runContainerInPod(pod *api.Pod, container *api.Container, netMode, ipcMode, pidMode, podIP string, restartCount int) (kubecontainer.ContainerID, error) {
|
|
start := time.Now()
|
|
defer func() {
|
|
metrics.ContainerManagerLatency.WithLabelValues("runContainerInPod").Observe(metrics.SinceInMicroseconds(start))
|
|
}()
|
|
|
|
ref, err := kubecontainer.GenerateContainerRef(pod, container)
|
|
if err != nil {
|
|
glog.Errorf("Can't make a ref to pod %v, container %v: '%v'", pod.Name, container.Name, err)
|
|
} else {
|
|
glog.V(5).Infof("Generating ref for container %s: %#v", container.Name, ref)
|
|
}
|
|
|
|
opts, err := dm.runtimeHelper.GenerateRunContainerOptions(pod, container, podIP)
|
|
if err != nil {
|
|
return kubecontainer.ContainerID{}, fmt.Errorf("GenerateRunContainerOptions: %v", err)
|
|
}
|
|
|
|
utsMode := ""
|
|
if kubecontainer.IsHostNetworkPod(pod) {
|
|
utsMode = namespaceModeHost
|
|
}
|
|
|
|
oomScoreAdj := dm.calculateOomScoreAdj(pod, container)
|
|
|
|
id, err := dm.runContainer(pod, container, opts, ref, netMode, ipcMode, utsMode, pidMode, restartCount, oomScoreAdj)
|
|
if err != nil {
|
|
return kubecontainer.ContainerID{}, fmt.Errorf("runContainer: %v", err)
|
|
}
|
|
|
|
// Remember this reference so we can report events about this container
|
|
if ref != nil {
|
|
dm.containerRefManager.SetRef(id, ref)
|
|
}
|
|
|
|
if container.Lifecycle != nil && container.Lifecycle.PostStart != nil {
|
|
msg, handlerErr := dm.runner.Run(id, pod, container, container.Lifecycle.PostStart)
|
|
if handlerErr != nil {
|
|
err := fmt.Errorf("PostStart handler: %v", handlerErr)
|
|
dm.generateFailedContainerEvent(id, pod.Name, events.FailedPostStartHook, msg)
|
|
dm.KillContainerInPod(id, container, pod, err.Error(), nil)
|
|
return kubecontainer.ContainerID{}, err
|
|
}
|
|
}
|
|
|
|
// Container information is used in adjusting OOM scores, adding ndots and getting the logPath.
|
|
containerInfo, err := dm.client.InspectContainer(id.ID)
|
|
if err != nil {
|
|
return kubecontainer.ContainerID{}, fmt.Errorf("InspectContainer: %v", err)
|
|
}
|
|
|
|
// Create a symbolic link to the Docker container log file using a name which captures the
|
|
// full pod name, the container name and the Docker container ID. Cluster level logging will
|
|
// capture these symbolic filenames which can be used for search terms in Elasticsearch or for
|
|
// labels for Cloud Logging.
|
|
containerLogFile := containerInfo.LogPath
|
|
symlinkFile := LogSymlink(dm.containerLogsDir, kubecontainer.GetPodFullName(pod), container.Name, id.ID)
|
|
if err = dm.os.Symlink(containerLogFile, symlinkFile); err != nil {
|
|
glog.Errorf("Failed to create symbolic link to the log file of pod %q container %q: %v", format.Pod(pod), container.Name, err)
|
|
}
|
|
|
|
// Check if current docker version is higher than 1.10. Otherwise, we have to apply OOMScoreAdj instead of using docker API.
|
|
// TODO: Remove this logic after we stop supporting docker version < 1.10.
|
|
if err = dm.applyOOMScoreAdjIfNeeded(pod, container, containerInfo); err != nil {
|
|
return kubecontainer.ContainerID{}, err
|
|
}
|
|
|
|
// The addNDotsOption call appends the ndots option to the resolv.conf file generated by docker.
|
|
// This resolv.conf file is shared by all containers of the same pod, and needs to be modified only once per pod.
|
|
// we modify it when the pause container is created since it is the first container created in the pod since it holds
|
|
// the networking namespace.
|
|
if container.Name == PodInfraContainerName && utsMode != namespaceModeHost {
|
|
err = addNDotsOption(containerInfo.ResolvConfPath)
|
|
if err != nil {
|
|
return kubecontainer.ContainerID{}, fmt.Errorf("addNDotsOption: %v", err)
|
|
}
|
|
}
|
|
|
|
return id, err
|
|
}
|
|
|
|
func (dm *DockerManager) applyOOMScoreAdjIfNeeded(pod *api.Pod, container *api.Container, containerInfo *dockertypes.ContainerJSON) error {
|
|
// Compare current API version with expected api version.
|
|
result, err := dm.checkDockerAPIVersion(dockerV110APIVersion)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to check docker api version: %v", err)
|
|
}
|
|
// If current api version is older than OOMScoreAdj requested, use the old way.
|
|
if result < 0 {
|
|
if err := dm.applyOOMScoreAdj(pod, container, containerInfo); err != nil {
|
|
return fmt.Errorf("Failed to apply oom-score-adj to container %q- %v", containerInfo.Name, err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (dm *DockerManager) calculateOomScoreAdj(pod *api.Pod, container *api.Container) int {
|
|
// Set OOM score of the container based on the priority of the container.
|
|
// Processes in lower-priority pods should be killed first if the system runs out of memory.
|
|
// The main pod infrastructure container is considered high priority, since if it is killed the
|
|
// whole pod will die.
|
|
var oomScoreAdj int
|
|
if container.Name == PodInfraContainerName {
|
|
oomScoreAdj = qos.PodInfraOOMAdj
|
|
} else {
|
|
oomScoreAdj = qos.GetContainerOOMScoreAdjust(pod, container, int64(dm.machineInfo.MemoryCapacity))
|
|
|
|
}
|
|
|
|
return oomScoreAdj
|
|
}
|
|
|
|
// versionInfo wraps api version and daemon version.
|
|
type versionInfo struct {
|
|
apiVersion kubecontainer.Version
|
|
daemonVersion kubecontainer.Version
|
|
}
|
|
|
|
// checkDockerAPIVersion checks current docker API version against expected version.
|
|
// Return:
|
|
// 1 : newer than expected version
|
|
// -1: older than expected version
|
|
// 0 : same version
|
|
func (dm *DockerManager) checkDockerAPIVersion(expectedVersion string) (int, error) {
|
|
|
|
value, err := dm.versionCache.Get(dm.machineInfo.MachineID)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
apiVersion := value.(versionInfo).apiVersion
|
|
result, err := apiVersion.Compare(expectedVersion)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("Failed to compare current docker api version %v with OOMScoreAdj supported Docker version %q - %v",
|
|
apiVersion, expectedVersion, err)
|
|
}
|
|
return result, nil
|
|
}
|
|
|
|
func addNDotsOption(resolvFilePath string) error {
|
|
if len(resolvFilePath) == 0 {
|
|
glog.Errorf("ResolvConfPath is empty.")
|
|
return nil
|
|
}
|
|
|
|
if _, err := os.Stat(resolvFilePath); os.IsNotExist(err) {
|
|
return fmt.Errorf("ResolvConfPath %q does not exist", resolvFilePath)
|
|
}
|
|
|
|
glog.V(4).Infof("DNS ResolvConfPath exists: %s. Will attempt to add ndots option: %s", resolvFilePath, ndotsDNSOption)
|
|
|
|
if err := appendToFile(resolvFilePath, ndotsDNSOption); err != nil {
|
|
glog.Errorf("resolv.conf could not be updated: %v", err)
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func appendToFile(filePath, stringToAppend string) error {
|
|
f, err := os.OpenFile(filePath, os.O_APPEND|os.O_WRONLY, 0644)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer f.Close()
|
|
|
|
_, err = f.WriteString(stringToAppend)
|
|
return err
|
|
}
|
|
|
|
// createPodInfraContainer starts the pod infra container for a pod. Returns the docker container ID of the newly created container.
|
|
// If any error occurs in this function, it will return a brief error and a detailed error message.
|
|
func (dm *DockerManager) createPodInfraContainer(pod *api.Pod) (kubecontainer.DockerID, error, string) {
|
|
start := time.Now()
|
|
defer func() {
|
|
metrics.ContainerManagerLatency.WithLabelValues("createPodInfraContainer").Observe(metrics.SinceInMicroseconds(start))
|
|
}()
|
|
// Use host networking if specified.
|
|
netNamespace := ""
|
|
var ports []api.ContainerPort
|
|
|
|
if kubecontainer.IsHostNetworkPod(pod) {
|
|
netNamespace = namespaceModeHost
|
|
} else if dm.networkPlugin.Name() == "cni" || dm.networkPlugin.Name() == "kubenet" {
|
|
netNamespace = "none"
|
|
} else {
|
|
// Docker only exports ports from the pod infra container. Let's
|
|
// collect all of the relevant ports and export them.
|
|
for _, container := range pod.Spec.InitContainers {
|
|
ports = append(ports, container.Ports...)
|
|
}
|
|
for _, container := range pod.Spec.Containers {
|
|
ports = append(ports, container.Ports...)
|
|
}
|
|
}
|
|
|
|
container := &api.Container{
|
|
Name: PodInfraContainerName,
|
|
Image: dm.podInfraContainerImage,
|
|
Ports: ports,
|
|
ImagePullPolicy: podInfraContainerImagePullPolicy,
|
|
Env: dm.podInfraContainerEnv,
|
|
}
|
|
|
|
// No pod secrets for the infra container.
|
|
// The message isn't needed for the Infra container
|
|
if err, msg := dm.imagePuller.EnsureImageExists(pod, container, nil); err != nil {
|
|
return "", err, msg
|
|
}
|
|
|
|
// Currently we don't care about restart count of infra container, just set it to 0.
|
|
id, err := dm.runContainerInPod(pod, container, netNamespace, getIPCMode(pod), getPidMode(pod), "", 0)
|
|
if err != nil {
|
|
return "", kubecontainer.ErrRunContainer, err.Error()
|
|
}
|
|
|
|
return kubecontainer.DockerID(id.ID), nil, ""
|
|
}
|
|
|
|
// Structure keeping information on changes that need to happen for a pod. The semantics is as follows:
|
|
// - startInfraContainer is true if new Infra Containers have to be started and old one (if running) killed.
|
|
// Additionally if it is true then containersToKeep have to be empty
|
|
// - infraContainerId have to be set if and only if startInfraContainer is false. It stores dockerID of running Infra Container
|
|
// - containersToStart keeps indices of Specs of containers that have to be started and reasons why containers will be started.
|
|
// - containersToKeep stores mapping from dockerIDs of running containers to indices of their Specs for containers that
|
|
// should be kept running. If startInfraContainer is false then it contains an entry for infraContainerId (mapped to -1).
|
|
// It shouldn't be the case where containersToStart is empty and containersToKeep contains only infraContainerId. In such case
|
|
// Infra Container should be killed, hence it's removed from this map.
|
|
// - all init containers are stored in initContainersToKeep
|
|
// - all running containers which are NOT contained in containersToKeep and initContainersToKeep should be killed.
|
|
type podContainerChangesSpec struct {
|
|
StartInfraContainer bool
|
|
InfraChanged bool
|
|
InfraContainerId kubecontainer.DockerID
|
|
InitFailed bool
|
|
InitContainersToKeep map[kubecontainer.DockerID]int
|
|
ContainersToStart map[int]string
|
|
ContainersToKeep map[kubecontainer.DockerID]int
|
|
}
|
|
|
|
func (dm *DockerManager) computePodContainerChanges(pod *api.Pod, podStatus *kubecontainer.PodStatus) (podContainerChangesSpec, error) {
|
|
start := time.Now()
|
|
defer func() {
|
|
metrics.ContainerManagerLatency.WithLabelValues("computePodContainerChanges").Observe(metrics.SinceInMicroseconds(start))
|
|
}()
|
|
glog.V(5).Infof("Syncing Pod %q: %#v", format.Pod(pod), pod)
|
|
|
|
containersToStart := make(map[int]string)
|
|
containersToKeep := make(map[kubecontainer.DockerID]int)
|
|
|
|
var err error
|
|
var podInfraContainerID kubecontainer.DockerID
|
|
var changed bool
|
|
podInfraContainerStatus := podStatus.FindContainerStatusByName(PodInfraContainerName)
|
|
if podInfraContainerStatus != nil && podInfraContainerStatus.State == kubecontainer.ContainerStateRunning {
|
|
glog.V(4).Infof("Found pod infra container for %q", format.Pod(pod))
|
|
changed, err = dm.podInfraContainerChanged(pod, podInfraContainerStatus)
|
|
if err != nil {
|
|
return podContainerChangesSpec{}, err
|
|
}
|
|
}
|
|
|
|
createPodInfraContainer := true
|
|
if podInfraContainerStatus == nil || podInfraContainerStatus.State != kubecontainer.ContainerStateRunning {
|
|
glog.V(2).Infof("Need to restart pod infra container for %q because it is not found", format.Pod(pod))
|
|
} else if changed {
|
|
glog.V(2).Infof("Need to restart pod infra container for %q because it is changed", format.Pod(pod))
|
|
} else {
|
|
glog.V(4).Infof("Pod infra container looks good, keep it %q", format.Pod(pod))
|
|
createPodInfraContainer = false
|
|
podInfraContainerID = kubecontainer.DockerID(podInfraContainerStatus.ID.ID)
|
|
containersToKeep[podInfraContainerID] = -1
|
|
}
|
|
|
|
// check the status of the init containers
|
|
initFailed := false
|
|
initContainersToKeep := make(map[kubecontainer.DockerID]int)
|
|
// always reset the init containers if the pod is reset
|
|
if !createPodInfraContainer {
|
|
// keep all successfully completed containers up to and including the first failing container
|
|
Containers:
|
|
for i, container := range pod.Spec.InitContainers {
|
|
containerStatus := podStatus.FindContainerStatusByName(container.Name)
|
|
switch {
|
|
case containerStatus == nil:
|
|
continue
|
|
case containerStatus.State == kubecontainer.ContainerStateRunning:
|
|
initContainersToKeep[kubecontainer.DockerID(containerStatus.ID.ID)] = i
|
|
case containerStatus.State == kubecontainer.ContainerStateExited:
|
|
initContainersToKeep[kubecontainer.DockerID(containerStatus.ID.ID)] = i
|
|
// TODO: should we abstract the "did the init container fail" check?
|
|
if containerStatus.ExitCode != 0 {
|
|
initFailed = true
|
|
break Containers
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// check the status of the containers
|
|
for index, container := range pod.Spec.Containers {
|
|
|
|
containerStatus := podStatus.FindContainerStatusByName(container.Name)
|
|
if containerStatus == nil || containerStatus.State != kubecontainer.ContainerStateRunning {
|
|
if kubecontainer.ShouldContainerBeRestarted(&container, pod, podStatus) {
|
|
// If we are here it means that the container is dead and should be restarted, or never existed and should
|
|
// be created. We may be inserting this ID again if the container has changed and it has
|
|
// RestartPolicy::Always, but it's not a big deal.
|
|
message := fmt.Sprintf("Container %+v is dead, but RestartPolicy says that we should restart it.", container)
|
|
glog.V(3).Info(message)
|
|
containersToStart[index] = message
|
|
}
|
|
continue
|
|
}
|
|
|
|
containerID := kubecontainer.DockerID(containerStatus.ID.ID)
|
|
glog.V(3).Infof("pod %q container %q exists as %v", format.Pod(pod), container.Name, containerID)
|
|
|
|
if createPodInfraContainer {
|
|
// createPodInfraContainer == true and Container exists
|
|
// If we're creating infra container everything will be killed anyway
|
|
// If RestartPolicy is Always or OnFailure we restart containers that were running before we
|
|
// killed them when restarting Infra Container.
|
|
if pod.Spec.RestartPolicy != api.RestartPolicyNever {
|
|
message := fmt.Sprintf("Infra Container is being recreated. %q will be restarted.", container.Name)
|
|
glog.V(1).Info(message)
|
|
containersToStart[index] = message
|
|
}
|
|
continue
|
|
}
|
|
|
|
if initFailed {
|
|
// initialization failed and Container exists
|
|
// If we have an initialization failure everything will be killed anyway
|
|
// If RestartPolicy is Always or OnFailure we restart containers that were running before we
|
|
// killed them when re-running initialization
|
|
if pod.Spec.RestartPolicy != api.RestartPolicyNever {
|
|
message := fmt.Sprintf("Failed to initialize pod. %q will be restarted.", container.Name)
|
|
glog.V(1).Info(message)
|
|
containersToStart[index] = message
|
|
}
|
|
continue
|
|
}
|
|
|
|
// At this point, the container is running and pod infra container is good.
|
|
// We will look for changes and check healthiness for the container.
|
|
expectedHash := kubecontainer.HashContainer(&container)
|
|
hash := containerStatus.Hash
|
|
containerChanged := hash != 0 && hash != expectedHash
|
|
if containerChanged {
|
|
message := fmt.Sprintf("pod %q container %q hash changed (%d vs %d), it will be killed and re-created.", format.Pod(pod), container.Name, hash, expectedHash)
|
|
glog.Info(message)
|
|
containersToStart[index] = message
|
|
continue
|
|
}
|
|
|
|
liveness, found := dm.livenessManager.Get(containerStatus.ID)
|
|
if !found || liveness == proberesults.Success {
|
|
containersToKeep[containerID] = index
|
|
continue
|
|
}
|
|
if pod.Spec.RestartPolicy != api.RestartPolicyNever {
|
|
message := fmt.Sprintf("pod %q container %q is unhealthy, it will be killed and re-created.", format.Pod(pod), container.Name)
|
|
glog.Info(message)
|
|
containersToStart[index] = message
|
|
}
|
|
}
|
|
|
|
// After the loop one of the following should be true:
|
|
// - createPodInfraContainer is true and containersToKeep is empty.
|
|
// (In fact, when createPodInfraContainer is false, containersToKeep will not be touched).
|
|
// - createPodInfraContainer is false and containersToKeep contains at least ID of Infra Container
|
|
|
|
// If Infra container is the last running one, we don't want to keep it, and we don't want to
|
|
// keep any init containers.
|
|
if !createPodInfraContainer && len(containersToStart) == 0 && len(containersToKeep) == 1 {
|
|
containersToKeep = make(map[kubecontainer.DockerID]int)
|
|
initContainersToKeep = make(map[kubecontainer.DockerID]int)
|
|
}
|
|
|
|
return podContainerChangesSpec{
|
|
StartInfraContainer: createPodInfraContainer,
|
|
InfraChanged: changed,
|
|
InfraContainerId: podInfraContainerID,
|
|
InitFailed: initFailed,
|
|
InitContainersToKeep: initContainersToKeep,
|
|
ContainersToStart: containersToStart,
|
|
ContainersToKeep: containersToKeep,
|
|
}, nil
|
|
}
|
|
|
|
// Sync the running pod to match the specified desired pod.
|
|
func (dm *DockerManager) SyncPod(pod *api.Pod, _ api.PodStatus, podStatus *kubecontainer.PodStatus, pullSecrets []api.Secret, backOff *flowcontrol.Backoff) (result kubecontainer.PodSyncResult) {
|
|
start := time.Now()
|
|
defer func() {
|
|
metrics.ContainerManagerLatency.WithLabelValues("SyncPod").Observe(metrics.SinceInMicroseconds(start))
|
|
}()
|
|
|
|
containerChanges, err := dm.computePodContainerChanges(pod, podStatus)
|
|
if err != nil {
|
|
result.Fail(err)
|
|
return
|
|
}
|
|
glog.V(3).Infof("Got container changes for pod %q: %+v", format.Pod(pod), containerChanges)
|
|
|
|
if containerChanges.InfraChanged {
|
|
dm.recorder.Eventf(pod, api.EventTypeNormal, "InfraChanged", "Pod infrastructure changed, it will be killed and re-created.")
|
|
}
|
|
if containerChanges.StartInfraContainer || (len(containerChanges.ContainersToKeep) == 0 && len(containerChanges.ContainersToStart) == 0) {
|
|
if len(containerChanges.ContainersToKeep) == 0 && len(containerChanges.ContainersToStart) == 0 {
|
|
glog.V(4).Infof("Killing Infra Container for %q because all other containers are dead.", format.Pod(pod))
|
|
} else {
|
|
glog.V(4).Infof("Killing Infra Container for %q, will start new one", format.Pod(pod))
|
|
}
|
|
|
|
// Killing phase: if we want to start new infra container, or nothing is running kill everything (including infra container)
|
|
// TODO(random-liu): We'll use pod status directly in the future
|
|
killResult := dm.killPodWithSyncResult(pod, kubecontainer.ConvertPodStatusToRunningPod(dm.Type(), podStatus), nil)
|
|
result.AddPodSyncResult(killResult)
|
|
if killResult.Error() != nil {
|
|
return
|
|
}
|
|
} else {
|
|
// Otherwise kill any running containers in this pod which are not specified as ones to keep.
|
|
runningContainerStatues := podStatus.GetRunningContainerStatuses()
|
|
for _, containerStatus := range runningContainerStatues {
|
|
_, keep := containerChanges.ContainersToKeep[kubecontainer.DockerID(containerStatus.ID.ID)]
|
|
_, keepInit := containerChanges.InitContainersToKeep[kubecontainer.DockerID(containerStatus.ID.ID)]
|
|
if !keep && !keepInit {
|
|
glog.V(3).Infof("Killing unwanted container %q(id=%q) for pod %q", containerStatus.Name, containerStatus.ID, format.Pod(pod))
|
|
// attempt to find the appropriate container policy
|
|
var podContainer *api.Container
|
|
var killMessage string
|
|
for i, c := range pod.Spec.Containers {
|
|
if c.Name == containerStatus.Name {
|
|
podContainer = &pod.Spec.Containers[i]
|
|
killMessage = containerChanges.ContainersToStart[i]
|
|
break
|
|
}
|
|
}
|
|
killContainerResult := kubecontainer.NewSyncResult(kubecontainer.KillContainer, containerStatus.Name)
|
|
result.AddSyncResult(killContainerResult)
|
|
if err := dm.KillContainerInPod(containerStatus.ID, podContainer, pod, killMessage, nil); err != nil {
|
|
killContainerResult.Fail(kubecontainer.ErrKillContainer, err.Error())
|
|
glog.Errorf("Error killing container %q(id=%q) for pod %q: %v", containerStatus.Name, containerStatus.ID, format.Pod(pod), err)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Keep terminated init containers fairly aggressively controlled
|
|
dm.pruneInitContainersBeforeStart(pod, podStatus, containerChanges.InitContainersToKeep)
|
|
|
|
// We pass the value of the podIP down to runContainerInPod, which in turn
|
|
// passes it to various other functions, in order to facilitate
|
|
// functionality that requires this value (hosts file and downward API)
|
|
// and avoid races determining the pod IP in cases where a container
|
|
// requires restart but the podIP isn't in the status manager yet.
|
|
//
|
|
// We default to the IP in the passed-in pod status, and overwrite it if the
|
|
// infra container needs to be (re)started.
|
|
podIP := ""
|
|
if podStatus != nil {
|
|
podIP = podStatus.IP
|
|
}
|
|
|
|
// If we should create infra container then we do it first.
|
|
podInfraContainerID := containerChanges.InfraContainerId
|
|
if containerChanges.StartInfraContainer && (len(containerChanges.ContainersToStart) > 0) {
|
|
glog.V(4).Infof("Creating pod infra container for %q", format.Pod(pod))
|
|
startContainerResult := kubecontainer.NewSyncResult(kubecontainer.StartContainer, PodInfraContainerName)
|
|
result.AddSyncResult(startContainerResult)
|
|
var msg string
|
|
podInfraContainerID, err, msg = dm.createPodInfraContainer(pod)
|
|
if err != nil {
|
|
startContainerResult.Fail(err, msg)
|
|
glog.Errorf("Failed to create pod infra container: %v; Skipping pod %q: %s", err, format.Pod(pod), msg)
|
|
return
|
|
}
|
|
|
|
setupNetworkResult := kubecontainer.NewSyncResult(kubecontainer.SetupNetwork, kubecontainer.GetPodFullName(pod))
|
|
result.AddSyncResult(setupNetworkResult)
|
|
if !kubecontainer.IsHostNetworkPod(pod) {
|
|
glog.V(3).Infof("Calling network plugin %s to setup pod for %s", dm.networkPlugin.Name(), format.Pod(pod))
|
|
err = dm.networkPlugin.SetUpPod(pod.Namespace, pod.Name, podInfraContainerID.ContainerID())
|
|
if err != nil {
|
|
// TODO: (random-liu) There shouldn't be "Skipping pod" in sync result message
|
|
message := fmt.Sprintf("Failed to setup network for pod %q using network plugins %q: %v; Skipping pod", format.Pod(pod), dm.networkPlugin.Name(), err)
|
|
setupNetworkResult.Fail(kubecontainer.ErrSetupNetwork, message)
|
|
glog.Error(message)
|
|
|
|
// Delete infra container
|
|
killContainerResult := kubecontainer.NewSyncResult(kubecontainer.KillContainer, PodInfraContainerName)
|
|
result.AddSyncResult(killContainerResult)
|
|
if delErr := dm.KillContainerInPod(kubecontainer.ContainerID{
|
|
ID: string(podInfraContainerID),
|
|
Type: "docker"}, nil, pod, message, nil); delErr != nil {
|
|
killContainerResult.Fail(kubecontainer.ErrKillContainer, delErr.Error())
|
|
glog.Warningf("Clear infra container failed for pod %q: %v", format.Pod(pod), delErr)
|
|
}
|
|
return
|
|
}
|
|
|
|
// Setup the host interface unless the pod is on the host's network (FIXME: move to networkPlugin when ready)
|
|
podInfraContainer, err := dm.client.InspectContainer(string(podInfraContainerID))
|
|
if err != nil {
|
|
glog.Errorf("Failed to inspect pod infra container: %v; Skipping pod %q", err, format.Pod(pod))
|
|
result.Fail(err)
|
|
return
|
|
}
|
|
|
|
if dm.configureHairpinMode {
|
|
if err = hairpin.SetUpContainerPid(podInfraContainer.State.Pid, network.DefaultInterfaceName); err != nil {
|
|
glog.Warningf("Hairpin setup failed for pod %q: %v", format.Pod(pod), err)
|
|
}
|
|
}
|
|
|
|
// Overwrite the podIP passed in the pod status, since we just started the infra container.
|
|
podIP, err = dm.determineContainerIP(pod.Namespace, pod.Name, podInfraContainer)
|
|
if err != nil {
|
|
glog.Errorf("Network error: %v; Skipping pod %q", err, format.Pod(pod))
|
|
result.Fail(err)
|
|
return
|
|
}
|
|
glog.Infof("Determined pod ip after infra change: %q: %q", format.Pod(pod), podIP)
|
|
}
|
|
}
|
|
|
|
next, status, done := findActiveInitContainer(pod, podStatus)
|
|
if status != nil {
|
|
if status.ExitCode != 0 {
|
|
// container initialization has failed, flag the pod as failed
|
|
initContainerResult := kubecontainer.NewSyncResult(kubecontainer.InitContainer, status.Name)
|
|
initContainerResult.Fail(kubecontainer.ErrRunInitContainer, fmt.Sprintf("init container %q exited with %d", status.Name, status.ExitCode))
|
|
result.AddSyncResult(initContainerResult)
|
|
if pod.Spec.RestartPolicy == api.RestartPolicyNever {
|
|
utilruntime.HandleError(fmt.Errorf("error running pod %q init container %q, restart=Never: %#v", format.Pod(pod), status.Name, status))
|
|
return
|
|
}
|
|
utilruntime.HandleError(fmt.Errorf("Error running pod %q init container %q, restarting: %#v", format.Pod(pod), status.Name, status))
|
|
}
|
|
}
|
|
|
|
// Note: when configuring the pod's containers anything that can be configured by pointing
|
|
// to the namespace of the infra container should use namespaceMode. This includes things like the net namespace
|
|
// and IPC namespace. PID mode cannot point to another container right now.
|
|
// See createPodInfraContainer for infra container setup.
|
|
namespaceMode := fmt.Sprintf("container:%v", podInfraContainerID)
|
|
pidMode := getPidMode(pod)
|
|
|
|
if next != nil {
|
|
if len(containerChanges.ContainersToStart) == 0 {
|
|
glog.V(4).Infof("No containers to start, stopping at init container %+v in pod %v", next.Name, format.Pod(pod))
|
|
return
|
|
}
|
|
|
|
// If we need to start the next container, do so now then exit
|
|
container := next
|
|
startContainerResult := kubecontainer.NewSyncResult(kubecontainer.StartContainer, container.Name)
|
|
result.AddSyncResult(startContainerResult)
|
|
|
|
// containerChanges.StartInfraContainer causes the containers to be restarted for config reasons
|
|
if !containerChanges.StartInfraContainer {
|
|
isInBackOff, err, msg := dm.doBackOff(pod, container, podStatus, backOff)
|
|
if isInBackOff {
|
|
startContainerResult.Fail(err, msg)
|
|
glog.V(4).Infof("Backing Off restarting init container %+v in pod %v", container, format.Pod(pod))
|
|
return
|
|
}
|
|
}
|
|
|
|
glog.V(4).Infof("Creating init container %+v in pod %v", container, format.Pod(pod))
|
|
if err, msg := dm.tryContainerStart(container, pod, podStatus, pullSecrets, namespaceMode, pidMode, podIP); err != nil {
|
|
startContainerResult.Fail(err, msg)
|
|
utilruntime.HandleError(fmt.Errorf("container start failed: %v: %s", err, msg))
|
|
return
|
|
}
|
|
|
|
// Successfully started the container; clear the entry in the failure
|
|
glog.V(4).Infof("Completed init container %q for pod %q", container.Name, format.Pod(pod))
|
|
return
|
|
}
|
|
if !done {
|
|
// init container still running
|
|
glog.V(4).Infof("An init container is still running in pod %v", format.Pod(pod))
|
|
return
|
|
}
|
|
if containerChanges.InitFailed {
|
|
// init container still running
|
|
glog.V(4).Infof("Not all init containers have succeeded for pod %v", format.Pod(pod))
|
|
return
|
|
}
|
|
|
|
// Start regular containers
|
|
for idx := range containerChanges.ContainersToStart {
|
|
container := &pod.Spec.Containers[idx]
|
|
startContainerResult := kubecontainer.NewSyncResult(kubecontainer.StartContainer, container.Name)
|
|
result.AddSyncResult(startContainerResult)
|
|
|
|
// containerChanges.StartInfraContainer causes the containers to be restarted for config reasons
|
|
if !containerChanges.StartInfraContainer {
|
|
isInBackOff, err, msg := dm.doBackOff(pod, container, podStatus, backOff)
|
|
if isInBackOff {
|
|
startContainerResult.Fail(err, msg)
|
|
glog.V(4).Infof("Backing Off restarting container %+v in pod %v", container, format.Pod(pod))
|
|
continue
|
|
}
|
|
}
|
|
|
|
glog.V(4).Infof("Creating container %+v in pod %v", container, format.Pod(pod))
|
|
if err, msg := dm.tryContainerStart(container, pod, podStatus, pullSecrets, namespaceMode, pidMode, podIP); err != nil {
|
|
startContainerResult.Fail(err, msg)
|
|
utilruntime.HandleError(fmt.Errorf("container start failed: %v: %s", err, msg))
|
|
continue
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// tryContainerStart attempts to pull and start the container, returning an error and a reason string if the start
|
|
// was not successful.
|
|
func (dm *DockerManager) tryContainerStart(container *api.Container, pod *api.Pod, podStatus *kubecontainer.PodStatus, pullSecrets []api.Secret, namespaceMode, pidMode, podIP string) (err error, reason string) {
|
|
err, msg := dm.imagePuller.EnsureImageExists(pod, container, pullSecrets)
|
|
if err != nil {
|
|
return err, msg
|
|
}
|
|
|
|
if container.SecurityContext != nil && container.SecurityContext.RunAsNonRoot != nil && *container.SecurityContext.RunAsNonRoot {
|
|
err := dm.verifyNonRoot(container)
|
|
if err != nil {
|
|
return kubecontainer.ErrVerifyNonRoot, err.Error()
|
|
}
|
|
}
|
|
|
|
// For a new container, the RestartCount should be 0
|
|
restartCount := 0
|
|
containerStatus := podStatus.FindContainerStatusByName(container.Name)
|
|
if containerStatus != nil {
|
|
restartCount = containerStatus.RestartCount + 1
|
|
}
|
|
|
|
_, err = dm.runContainerInPod(pod, container, namespaceMode, namespaceMode, pidMode, podIP, restartCount)
|
|
if err != nil {
|
|
// TODO(bburns) : Perhaps blacklist a container after N failures?
|
|
return kubecontainer.ErrRunContainer, err.Error()
|
|
}
|
|
return nil, ""
|
|
}
|
|
|
|
// pruneInitContainers ensures that before we begin creating init containers, we have reduced the number
|
|
// of outstanding init containers still present. This reduces load on the container garbage collector
|
|
// by only preserving the most recent terminated init container.
|
|
func (dm *DockerManager) pruneInitContainersBeforeStart(pod *api.Pod, podStatus *kubecontainer.PodStatus, initContainersToKeep map[kubecontainer.DockerID]int) {
|
|
// only the last execution of each init container should be preserved, and only preserve it if it is in the
|
|
// list of init containers to keep.
|
|
initContainerNames := sets.NewString()
|
|
for _, container := range pod.Spec.InitContainers {
|
|
initContainerNames.Insert(container.Name)
|
|
}
|
|
for name := range initContainerNames {
|
|
count := 0
|
|
for _, status := range podStatus.ContainerStatuses {
|
|
if status.Name != name || !initContainerNames.Has(status.Name) || status.State != kubecontainer.ContainerStateExited {
|
|
continue
|
|
}
|
|
count++
|
|
// keep the first init container for this name
|
|
if count == 1 {
|
|
continue
|
|
}
|
|
// if there is a reason to preserve the older container, do so
|
|
if _, ok := initContainersToKeep[kubecontainer.DockerID(status.ID.ID)]; ok {
|
|
continue
|
|
}
|
|
|
|
// prune all other init containers that match this container name
|
|
// TODO: we may not need aggressive pruning
|
|
glog.V(4).Infof("Removing init container %q instance %q %d", status.Name, status.ID.ID, count)
|
|
if err := dm.client.RemoveContainer(status.ID.ID, dockertypes.ContainerRemoveOptions{RemoveVolumes: true}); err != nil {
|
|
if _, ok := err.(containerNotFoundError); ok {
|
|
count--
|
|
continue
|
|
}
|
|
utilruntime.HandleError(fmt.Errorf("failed to remove pod init container %q: %v; Skipping pod %q", status.Name, err, format.Pod(pod)))
|
|
// TODO: report serious errors
|
|
continue
|
|
}
|
|
|
|
// remove any references to this container
|
|
if _, ok := dm.containerRefManager.GetRef(status.ID); ok {
|
|
dm.containerRefManager.ClearRef(status.ID)
|
|
} else {
|
|
glog.Warningf("No ref for pod '%q'", pod.Name)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// findActiveInitContainer returns the status of the last failed container, the next init container to
|
|
// start, or done if there are no further init containers. Status is only returned if an init container
|
|
// failed, in which case next will point to the current container.
|
|
func findActiveInitContainer(pod *api.Pod, podStatus *kubecontainer.PodStatus) (next *api.Container, status *kubecontainer.ContainerStatus, done bool) {
|
|
if len(pod.Spec.InitContainers) == 0 {
|
|
return nil, nil, true
|
|
}
|
|
|
|
for i := len(pod.Spec.InitContainers) - 1; i >= 0; i-- {
|
|
container := &pod.Spec.InitContainers[i]
|
|
status := podStatus.FindContainerStatusByName(container.Name)
|
|
switch {
|
|
case status == nil:
|
|
continue
|
|
case status.State == kubecontainer.ContainerStateRunning:
|
|
return nil, nil, false
|
|
case status.State == kubecontainer.ContainerStateExited:
|
|
switch {
|
|
// the container has failed, we'll have to retry
|
|
case status.ExitCode != 0:
|
|
return &pod.Spec.InitContainers[i], status, false
|
|
// all init containers successful
|
|
case i == (len(pod.Spec.InitContainers) - 1):
|
|
return nil, nil, true
|
|
// all containers up to i successful, go to i+1
|
|
default:
|
|
return &pod.Spec.InitContainers[i+1], nil, false
|
|
}
|
|
}
|
|
}
|
|
|
|
return &pod.Spec.InitContainers[0], nil, false
|
|
}
|
|
|
|
// verifyNonRoot returns an error if the container or image will run as the root user.
|
|
func (dm *DockerManager) verifyNonRoot(container *api.Container) error {
|
|
if securitycontext.HasRunAsUser(container) {
|
|
if securitycontext.HasRootRunAsUser(container) {
|
|
return fmt.Errorf("container's runAsUser breaks non-root policy")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
imgRoot, err := dm.isImageRoot(container.Image)
|
|
if err != nil {
|
|
return fmt.Errorf("can't tell if image runs as root: %v", err)
|
|
}
|
|
if imgRoot {
|
|
return fmt.Errorf("container has no runAsUser and image will run as root")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// isImageRoot returns true if the user directive is not set on the image, the user is set to 0
|
|
// or the user is set to root. If there is an error inspecting the image this method will return
|
|
// false and return the error.
|
|
func (dm *DockerManager) isImageRoot(image string) (bool, error) {
|
|
img, err := dm.client.InspectImageByRef(image)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
if img == nil || img.Config == nil {
|
|
return false, fmt.Errorf("unable to inspect image %s, nil Config", image)
|
|
}
|
|
|
|
user := getUidFromUser(img.Config.User)
|
|
// if no user is defined container will run as root
|
|
if user == "" {
|
|
return true, nil
|
|
}
|
|
// do not allow non-numeric user directives
|
|
uid, err := strconv.Atoi(user)
|
|
if err != nil {
|
|
return false, fmt.Errorf("non-numeric user (%s) is not allowed", user)
|
|
}
|
|
// user is numeric, check for 0
|
|
return uid == 0, nil
|
|
}
|
|
|
|
// getUidFromUser splits the uid out of an uid:gid string.
|
|
func getUidFromUser(id string) string {
|
|
if id == "" {
|
|
return id
|
|
}
|
|
// split instances where the id may contain uid:gid
|
|
if strings.Contains(id, ":") {
|
|
return strings.Split(id, ":")[0]
|
|
}
|
|
// no gid, just return the id
|
|
return id
|
|
}
|
|
|
|
// If all instances of a container are garbage collected, doBackOff will also return false, which means the container may be restarted before the
|
|
// backoff deadline. However, because that won't cause error and the chance is really slim, we can just ignore it for now.
|
|
// If a container is still in backoff, the function will return a brief backoff error and a detailed error message.
|
|
func (dm *DockerManager) doBackOff(pod *api.Pod, container *api.Container, podStatus *kubecontainer.PodStatus, backOff *flowcontrol.Backoff) (bool, error, string) {
|
|
var cStatus *kubecontainer.ContainerStatus
|
|
// Use the finished time of the latest exited container as the start point to calculate whether to do back-off.
|
|
// TODO(random-liu): Better define backoff start point; add unit and e2e test after we finalize this. (See github issue #22240)
|
|
for _, c := range podStatus.ContainerStatuses {
|
|
if c.Name == container.Name && c.State == kubecontainer.ContainerStateExited {
|
|
cStatus = c
|
|
break
|
|
}
|
|
}
|
|
if cStatus != nil {
|
|
glog.Infof("checking backoff for container %q in pod %q", container.Name, pod.Name)
|
|
ts := cStatus.FinishedAt
|
|
// found a container that requires backoff
|
|
dockerName := KubeletContainerName{
|
|
PodFullName: kubecontainer.GetPodFullName(pod),
|
|
PodUID: pod.UID,
|
|
ContainerName: container.Name,
|
|
}
|
|
stableName, _, _ := BuildDockerName(dockerName, container)
|
|
if backOff.IsInBackOffSince(stableName, ts) {
|
|
if ref, err := kubecontainer.GenerateContainerRef(pod, container); err == nil {
|
|
dm.recorder.Eventf(ref, api.EventTypeWarning, events.BackOffStartContainer, "Back-off restarting failed docker container")
|
|
}
|
|
err := fmt.Errorf("Back-off %s restarting failed container=%s pod=%s", backOff.Get(stableName), container.Name, format.Pod(pod))
|
|
glog.Infof("%s", err.Error())
|
|
return true, kubecontainer.ErrCrashLoopBackOff, err.Error()
|
|
}
|
|
backOff.Next(stableName, ts)
|
|
}
|
|
return false, nil, ""
|
|
}
|
|
|
|
// getPidMode returns the pid mode to use on the docker container based on pod.Spec.HostPID.
|
|
func getPidMode(pod *api.Pod) string {
|
|
pidMode := ""
|
|
if pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.HostPID {
|
|
pidMode = namespaceModeHost
|
|
}
|
|
return pidMode
|
|
}
|
|
|
|
// getIPCMode returns the ipc mode to use on the docker container based on pod.Spec.HostIPC.
|
|
func getIPCMode(pod *api.Pod) string {
|
|
ipcMode := ""
|
|
if pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.HostIPC {
|
|
ipcMode = namespaceModeHost
|
|
}
|
|
return ipcMode
|
|
}
|
|
|
|
func (dm *DockerManager) DeleteContainer(containerID kubecontainer.ContainerID) error {
|
|
return dm.containerGC.deleteContainer(containerID.ID)
|
|
}
|
|
|
|
// GetNetNS returns the network namespace path for the given container
|
|
func (dm *DockerManager) GetNetNS(containerID kubecontainer.ContainerID) (string, error) {
|
|
inspectResult, err := dm.client.InspectContainer(containerID.ID)
|
|
if err != nil {
|
|
glog.Errorf("Error inspecting container: '%v'", err)
|
|
return "", err
|
|
}
|
|
if inspectResult.State.Pid == 0 {
|
|
// Docker reports pid 0 for an exited container. We can't use it to
|
|
// check the network namespace, so return an empty string instead.
|
|
glog.V(4).Infof("Cannot find network namespace for the terminated container %q", containerID.ID)
|
|
return "", nil
|
|
}
|
|
|
|
netnsPath := fmt.Sprintf(DockerNetnsFmt, inspectResult.State.Pid)
|
|
return netnsPath, nil
|
|
}
|
|
|
|
func (dm *DockerManager) GetPodContainerID(pod *kubecontainer.Pod) (kubecontainer.ContainerID, error) {
|
|
for _, c := range pod.Containers {
|
|
if c.Name == PodInfraContainerName {
|
|
return c.ID, nil
|
|
}
|
|
}
|
|
|
|
return kubecontainer.ContainerID{}, fmt.Errorf("Pod %s unknown to docker.", kubecontainer.BuildPodFullName(pod.Name, pod.Namespace))
|
|
}
|
|
|
|
// Garbage collection of dead containers
|
|
func (dm *DockerManager) GarbageCollect(gcPolicy kubecontainer.ContainerGCPolicy, allSourcesReady bool) error {
|
|
return dm.containerGC.GarbageCollect(gcPolicy, allSourcesReady)
|
|
}
|
|
|
|
func (dm *DockerManager) GetPodStatus(uid kubetypes.UID, name, namespace string) (*kubecontainer.PodStatus, error) {
|
|
podStatus := &kubecontainer.PodStatus{ID: uid, Name: name, Namespace: namespace}
|
|
// Now we retain restart count of container as a docker label. Each time a container
|
|
// restarts, pod will read the restart count from the registered dead container, increment
|
|
// it to get the new restart count, and then add a label with the new restart count on
|
|
// the newly started container.
|
|
// However, there are some limitations of this method:
|
|
// 1. When all dead containers were garbage collected, the container status could
|
|
// not get the historical value and would be *inaccurate*. Fortunately, the chance
|
|
// is really slim.
|
|
// 2. When working with old version containers which have no restart count label,
|
|
// we can only assume their restart count is 0.
|
|
// Anyhow, we only promised "best-effort" restart count reporting, we can just ignore
|
|
// these limitations now.
|
|
var containerStatuses []*kubecontainer.ContainerStatus
|
|
// We have added labels like pod name and pod namespace, it seems that we can do filtered list here.
|
|
// However, there may be some old containers without these labels, so at least now we can't do that.
|
|
// TODO(random-liu): Do only one list and pass in the list result in the future
|
|
// TODO(random-liu): Add filter when we are sure that all the containers have the labels
|
|
containers, err := dm.client.ListContainers(dockertypes.ContainerListOptions{All: true})
|
|
if err != nil {
|
|
return podStatus, err
|
|
}
|
|
// Loop through list of running and exited docker containers to construct
|
|
// the statuses. We assume docker returns a list of containers sorted in
|
|
// reverse by time.
|
|
// TODO: optimization: set maximum number of containers per container name to examine.
|
|
for _, c := range containers {
|
|
if len(c.Names) == 0 {
|
|
continue
|
|
}
|
|
dockerName, _, err := ParseDockerName(c.Names[0])
|
|
if err != nil {
|
|
continue
|
|
}
|
|
if dockerName.PodUID != uid {
|
|
continue
|
|
}
|
|
result, ip, err := dm.inspectContainer(c.ID, name, namespace)
|
|
if err != nil {
|
|
if _, ok := err.(containerNotFoundError); ok {
|
|
// https://github.com/kubernetes/kubernetes/issues/22541
|
|
// Sometimes when docker's state is corrupt, a container can be listed
|
|
// but couldn't be inspected. We fake a status for this container so
|
|
// that we can still return a status for the pod to sync.
|
|
result = &kubecontainer.ContainerStatus{
|
|
ID: kubecontainer.DockerID(c.ID).ContainerID(),
|
|
Name: dockerName.ContainerName,
|
|
State: kubecontainer.ContainerStateUnknown,
|
|
}
|
|
glog.Errorf("Unable to inspect container %q: %v", c.ID, err)
|
|
} else {
|
|
return podStatus, err
|
|
}
|
|
}
|
|
containerStatuses = append(containerStatuses, result)
|
|
if ip != "" {
|
|
podStatus.IP = ip
|
|
}
|
|
}
|
|
|
|
podStatus.ContainerStatuses = containerStatuses
|
|
return podStatus, nil
|
|
}
|
|
|
|
// getVersionInfo returns apiVersion & daemonVersion of docker runtime
|
|
func (dm *DockerManager) getVersionInfo() (versionInfo, error) {
|
|
apiVersion, err := dm.APIVersion()
|
|
if err != nil {
|
|
return versionInfo{}, err
|
|
}
|
|
daemonVersion, err := dm.Version()
|
|
if err != nil {
|
|
return versionInfo{}, err
|
|
}
|
|
return versionInfo{
|
|
apiVersion: apiVersion,
|
|
daemonVersion: daemonVersion,
|
|
}, nil
|
|
}
|
|
|
|
// Truncate the message if it exceeds max length.
|
|
func truncateMsg(msg string, max int) string {
|
|
if len(msg) <= max {
|
|
return msg
|
|
}
|
|
glog.V(2).Infof("Truncated %s", msg)
|
|
const truncatedMsg = "..TRUNCATED.."
|
|
begin := (max - len(truncatedMsg)) / 2
|
|
end := len(msg) - (max - (len(truncatedMsg) + begin))
|
|
return msg[:begin] + truncatedMsg + msg[end:]
|
|
}
|