mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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d08dfb92c7
Enhance the garbage collector to periodically refresh the resources it monitors (via discovery) to enable custom resource definition GC. This implementation caches Unstructured structs for any kinds not covered by a shared informer. The existing meta-only codec only supports compiled types; an improved codec which supports arbitrary types could be introduced to optimize caching to store only metadata for all non-informer types.
346 lines
14 KiB
Go
346 lines
14 KiB
Go
/*
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Copyright 2016 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 app implements a server that runs a set of active
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// components. This includes replication controllers, service endpoints and
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// nodes.
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//
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package app
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import (
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"fmt"
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"net"
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"strings"
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"time"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/runtime/schema"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/client-go/discovery"
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cacheddiscovery "k8s.io/client-go/discovery/cached"
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"k8s.io/client-go/dynamic"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/controller"
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endpointcontroller "k8s.io/kubernetes/pkg/controller/endpoint"
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"k8s.io/kubernetes/pkg/controller/garbagecollector"
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namespacecontroller "k8s.io/kubernetes/pkg/controller/namespace"
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nodecontroller "k8s.io/kubernetes/pkg/controller/node"
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"k8s.io/kubernetes/pkg/controller/podgc"
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replicationcontroller "k8s.io/kubernetes/pkg/controller/replication"
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resourcequotacontroller "k8s.io/kubernetes/pkg/controller/resourcequota"
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routecontroller "k8s.io/kubernetes/pkg/controller/route"
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servicecontroller "k8s.io/kubernetes/pkg/controller/service"
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serviceaccountcontroller "k8s.io/kubernetes/pkg/controller/serviceaccount"
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ttlcontroller "k8s.io/kubernetes/pkg/controller/ttl"
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"k8s.io/kubernetes/pkg/controller/volume/attachdetach"
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persistentvolumecontroller "k8s.io/kubernetes/pkg/controller/volume/persistentvolume"
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"k8s.io/kubernetes/pkg/features"
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quotainstall "k8s.io/kubernetes/pkg/quota/install"
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"k8s.io/kubernetes/pkg/util/metrics"
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)
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func startServiceController(ctx ControllerContext) (bool, error) {
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serviceController, err := servicecontroller.New(
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ctx.Cloud,
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ctx.ClientBuilder.ClientOrDie("service-controller"),
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ctx.InformerFactory.Core().V1().Services(),
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ctx.InformerFactory.Core().V1().Nodes(),
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ctx.Options.ClusterName,
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)
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if err != nil {
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glog.Errorf("Failed to start service controller: %v", err)
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return false, nil
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}
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go serviceController.Run(ctx.Stop, int(ctx.Options.ConcurrentServiceSyncs))
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return true, nil
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}
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func startNodeController(ctx ControllerContext) (bool, error) {
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var clusterCIDR *net.IPNet
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var err error
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if len(strings.TrimSpace(ctx.Options.ClusterCIDR)) != 0 {
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_, clusterCIDR, err = net.ParseCIDR(ctx.Options.ClusterCIDR)
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if err != nil {
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glog.Warningf("Unsuccessful parsing of cluster CIDR %v: %v", ctx.Options.ClusterCIDR, err)
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}
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}
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var serviceCIDR *net.IPNet
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if len(strings.TrimSpace(ctx.Options.ServiceCIDR)) != 0 {
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_, serviceCIDR, err = net.ParseCIDR(ctx.Options.ServiceCIDR)
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if err != nil {
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glog.Warningf("Unsuccessful parsing of service CIDR %v: %v", ctx.Options.ServiceCIDR, err)
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}
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}
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nodeController, err := nodecontroller.NewNodeController(
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ctx.InformerFactory.Core().V1().Pods(),
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ctx.InformerFactory.Core().V1().Nodes(),
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ctx.InformerFactory.Extensions().V1beta1().DaemonSets(),
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ctx.Cloud,
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ctx.ClientBuilder.ClientOrDie("node-controller"),
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ctx.Options.PodEvictionTimeout.Duration,
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ctx.Options.NodeEvictionRate,
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ctx.Options.SecondaryNodeEvictionRate,
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ctx.Options.LargeClusterSizeThreshold,
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ctx.Options.UnhealthyZoneThreshold,
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ctx.Options.NodeMonitorGracePeriod.Duration,
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ctx.Options.NodeStartupGracePeriod.Duration,
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ctx.Options.NodeMonitorPeriod.Duration,
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clusterCIDR,
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serviceCIDR,
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int(ctx.Options.NodeCIDRMaskSize),
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ctx.Options.AllocateNodeCIDRs,
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nodecontroller.CIDRAllocatorType(ctx.Options.CIDRAllocatorType),
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ctx.Options.EnableTaintManager,
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utilfeature.DefaultFeatureGate.Enabled(features.TaintBasedEvictions),
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)
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if err != nil {
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return true, err
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}
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go nodeController.Run(ctx.Stop)
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return true, nil
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}
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func startRouteController(ctx ControllerContext) (bool, error) {
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_, clusterCIDR, err := net.ParseCIDR(ctx.Options.ClusterCIDR)
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if err != nil {
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glog.Warningf("Unsuccessful parsing of cluster CIDR %v: %v", ctx.Options.ClusterCIDR, err)
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}
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if !ctx.Options.AllocateNodeCIDRs || !ctx.Options.ConfigureCloudRoutes {
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glog.Infof("Will not configure cloud provider routes for allocate-node-cidrs: %v, configure-cloud-routes: %v.", ctx.Options.AllocateNodeCIDRs, ctx.Options.ConfigureCloudRoutes)
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return false, nil
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}
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if ctx.Cloud == nil {
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glog.Warning("configure-cloud-routes is set, but no cloud provider specified. Will not configure cloud provider routes.")
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return false, nil
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}
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routes, ok := ctx.Cloud.Routes()
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if !ok {
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glog.Warning("configure-cloud-routes is set, but cloud provider does not support routes. Will not configure cloud provider routes.")
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return false, nil
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}
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routeController := routecontroller.New(routes, ctx.ClientBuilder.ClientOrDie("route-controller"), ctx.InformerFactory.Core().V1().Nodes(), ctx.Options.ClusterName, clusterCIDR)
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go routeController.Run(ctx.Stop, ctx.Options.RouteReconciliationPeriod.Duration)
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return true, nil
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}
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func startPersistentVolumeBinderController(ctx ControllerContext) (bool, error) {
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params := persistentvolumecontroller.ControllerParameters{
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KubeClient: ctx.ClientBuilder.ClientOrDie("persistent-volume-binder"),
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SyncPeriod: ctx.Options.PVClaimBinderSyncPeriod.Duration,
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VolumePlugins: ProbeControllerVolumePlugins(ctx.Cloud, ctx.Options.VolumeConfiguration),
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Cloud: ctx.Cloud,
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ClusterName: ctx.Options.ClusterName,
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VolumeInformer: ctx.InformerFactory.Core().V1().PersistentVolumes(),
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ClaimInformer: ctx.InformerFactory.Core().V1().PersistentVolumeClaims(),
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ClassInformer: ctx.InformerFactory.Storage().V1().StorageClasses(),
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EnableDynamicProvisioning: ctx.Options.VolumeConfiguration.EnableDynamicProvisioning,
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}
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volumeController, volumeControllerErr := persistentvolumecontroller.NewController(params)
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if volumeControllerErr != nil {
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return true, fmt.Errorf("failed to construct persistentvolume controller: %v", volumeControllerErr)
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}
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go volumeController.Run(ctx.Stop)
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return true, nil
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}
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func startAttachDetachController(ctx ControllerContext) (bool, error) {
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if ctx.Options.ReconcilerSyncLoopPeriod.Duration < time.Second {
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return true, fmt.Errorf("Duration time must be greater than one second as set via command line option reconcile-sync-loop-period.")
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}
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attachDetachController, attachDetachControllerErr :=
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attachdetach.NewAttachDetachController(
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ctx.ClientBuilder.ClientOrDie("attachdetach-controller"),
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ctx.InformerFactory.Core().V1().Pods(),
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ctx.InformerFactory.Core().V1().Nodes(),
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ctx.InformerFactory.Core().V1().PersistentVolumeClaims(),
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ctx.InformerFactory.Core().V1().PersistentVolumes(),
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ctx.Cloud,
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ProbeAttachableVolumePlugins(ctx.Options.VolumeConfiguration),
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ctx.Options.DisableAttachDetachReconcilerSync,
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ctx.Options.ReconcilerSyncLoopPeriod.Duration,
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attachdetach.DefaultTimerConfig,
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)
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if attachDetachControllerErr != nil {
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return true, fmt.Errorf("failed to start attach/detach controller: %v", attachDetachControllerErr)
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}
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go attachDetachController.Run(ctx.Stop)
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return true, nil
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}
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func startEndpointController(ctx ControllerContext) (bool, error) {
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go endpointcontroller.NewEndpointController(
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ctx.InformerFactory.Core().V1().Pods(),
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ctx.InformerFactory.Core().V1().Services(),
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ctx.InformerFactory.Core().V1().Endpoints(),
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ctx.ClientBuilder.ClientOrDie("endpoint-controller"),
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).Run(int(ctx.Options.ConcurrentEndpointSyncs), ctx.Stop)
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return true, nil
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}
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func startReplicationController(ctx ControllerContext) (bool, error) {
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go replicationcontroller.NewReplicationManager(
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ctx.InformerFactory.Core().V1().Pods(),
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ctx.InformerFactory.Core().V1().ReplicationControllers(),
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ctx.ClientBuilder.ClientOrDie("replication-controller"),
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replicationcontroller.BurstReplicas,
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).Run(int(ctx.Options.ConcurrentRCSyncs), ctx.Stop)
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return true, nil
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}
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func startPodGCController(ctx ControllerContext) (bool, error) {
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go podgc.NewPodGC(
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ctx.ClientBuilder.ClientOrDie("pod-garbage-collector"),
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ctx.InformerFactory.Core().V1().Pods(),
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int(ctx.Options.TerminatedPodGCThreshold),
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).Run(ctx.Stop)
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return true, nil
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}
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func startResourceQuotaController(ctx ControllerContext) (bool, error) {
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resourceQuotaControllerClient := ctx.ClientBuilder.ClientOrDie("resourcequota-controller")
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resourceQuotaRegistry := quotainstall.NewRegistry(resourceQuotaControllerClient, ctx.InformerFactory)
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groupKindsToReplenish := []schema.GroupKind{
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api.Kind("Pod"),
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api.Kind("Service"),
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api.Kind("ReplicationController"),
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api.Kind("PersistentVolumeClaim"),
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api.Kind("Secret"),
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api.Kind("ConfigMap"),
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}
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resourceQuotaControllerOptions := &resourcequotacontroller.ResourceQuotaControllerOptions{
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QuotaClient: resourceQuotaControllerClient.Core(),
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ResourceQuotaInformer: ctx.InformerFactory.Core().V1().ResourceQuotas(),
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ResyncPeriod: controller.StaticResyncPeriodFunc(ctx.Options.ResourceQuotaSyncPeriod.Duration),
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Registry: resourceQuotaRegistry,
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ControllerFactory: resourcequotacontroller.NewReplenishmentControllerFactory(ctx.InformerFactory),
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ReplenishmentResyncPeriod: ResyncPeriod(&ctx.Options),
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GroupKindsToReplenish: groupKindsToReplenish,
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}
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if resourceQuotaControllerClient.Core().RESTClient().GetRateLimiter() != nil {
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metrics.RegisterMetricAndTrackRateLimiterUsage("resource_quota_controller", resourceQuotaControllerClient.Core().RESTClient().GetRateLimiter())
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}
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go resourcequotacontroller.NewResourceQuotaController(
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resourceQuotaControllerOptions,
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).Run(int(ctx.Options.ConcurrentResourceQuotaSyncs), ctx.Stop)
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return true, nil
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}
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func startNamespaceController(ctx ControllerContext) (bool, error) {
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// TODO: should use a dynamic RESTMapper built from the discovery results.
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restMapper := api.Registry.RESTMapper()
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// the namespace cleanup controller is very chatty. It makes lots of discovery calls and then it makes lots of delete calls
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// the ratelimiter negatively affects its speed. Deleting 100 total items in a namespace (that's only a few of each resource
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// including events), takes ~10 seconds by default.
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nsKubeconfig := ctx.ClientBuilder.ConfigOrDie("namespace-controller")
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nsKubeconfig.QPS *= 10
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nsKubeconfig.Burst *= 10
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namespaceKubeClient := clientset.NewForConfigOrDie(nsKubeconfig)
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namespaceClientPool := dynamic.NewClientPool(nsKubeconfig, restMapper, dynamic.LegacyAPIPathResolverFunc)
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discoverResourcesFn := namespaceKubeClient.Discovery().ServerPreferredNamespacedResources
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namespaceController := namespacecontroller.NewNamespaceController(
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namespaceKubeClient,
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namespaceClientPool,
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discoverResourcesFn,
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ctx.InformerFactory.Core().V1().Namespaces(),
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ctx.Options.NamespaceSyncPeriod.Duration,
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v1.FinalizerKubernetes,
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)
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go namespaceController.Run(int(ctx.Options.ConcurrentNamespaceSyncs), ctx.Stop)
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return true, nil
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}
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func startServiceAccountController(ctx ControllerContext) (bool, error) {
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go serviceaccountcontroller.NewServiceAccountsController(
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ctx.InformerFactory.Core().V1().ServiceAccounts(),
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ctx.InformerFactory.Core().V1().Namespaces(),
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ctx.ClientBuilder.ClientOrDie("service-account-controller"),
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serviceaccountcontroller.DefaultServiceAccountsControllerOptions(),
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).Run(1, ctx.Stop)
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return true, nil
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}
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func startTTLController(ctx ControllerContext) (bool, error) {
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go ttlcontroller.NewTTLController(
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ctx.InformerFactory.Core().V1().Nodes(),
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ctx.ClientBuilder.ClientOrDie("ttl-controller"),
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).Run(5, ctx.Stop)
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return true, nil
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}
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func startGarbageCollectorController(ctx ControllerContext) (bool, error) {
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if !ctx.Options.EnableGarbageCollector {
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return false, nil
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}
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gcClientset := ctx.ClientBuilder.ClientOrDie("generic-garbage-collector")
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// Use a discovery client capable of being refreshed.
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discoveryClient := cacheddiscovery.NewMemCacheClient(gcClientset.Discovery())
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restMapper := discovery.NewDeferredDiscoveryRESTMapper(discoveryClient, meta.InterfacesForUnstructured)
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restMapper.Reset()
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config := ctx.ClientBuilder.ConfigOrDie("generic-garbage-collector")
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config.ContentConfig = dynamic.ContentConfig()
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// TODO: Make NewMetadataCodecFactory support arbitrary (non-compiled)
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// resource types. Otherwise we'll be storing full Unstructured data in our
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// caches for custom resources. Consider porting it to work with
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// metav1alpha1.PartialObjectMetadata.
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metaOnlyClientPool := dynamic.NewClientPool(config, restMapper, dynamic.LegacyAPIPathResolverFunc)
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clientPool := dynamic.NewClientPool(config, restMapper, dynamic.LegacyAPIPathResolverFunc)
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// Get an initial set of deletable resources to prime the garbage collector.
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deletableResources, err := garbagecollector.GetDeletableResources(discoveryClient)
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if err != nil {
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return true, err
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}
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ignoredResources := make(map[schema.GroupResource]struct{})
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for _, r := range ctx.Options.GCIgnoredResources {
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ignoredResources[schema.GroupResource{Group: r.Group, Resource: r.Resource}] = struct{}{}
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}
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garbageCollector, err := garbagecollector.NewGarbageCollector(
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metaOnlyClientPool,
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clientPool,
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restMapper,
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deletableResources,
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ignoredResources,
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ctx.InformerFactory,
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)
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if err != nil {
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return true, fmt.Errorf("Failed to start the generic garbage collector: %v", err)
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}
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// Start the garbage collector.
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workers := int(ctx.Options.ConcurrentGCSyncs)
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go garbageCollector.Run(workers, ctx.Stop)
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// Periodically refresh the RESTMapper with new discovery information and sync
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// the garbage collector.
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go garbageCollector.Sync(restMapper, discoveryClient, 30*time.Second, ctx.Stop)
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return true, nil
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}
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