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105 lines
2.9 KiB
Go
105 lines
2.9 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 sysctl
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import (
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"fmt"
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v1helper "k8s.io/kubernetes/pkg/api/v1/helper"
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"k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/kubelet/lifecycle"
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)
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const (
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UnsupportedReason = "SysctlUnsupported"
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// CRI uses semver-compatible API version, while docker does not
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// (e.g., 1.24). Append the version with a ".0" so that it works
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// with both the CRI and dockertools comparison logic.
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dockerMinimumAPIVersion = "1.24.0"
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dockerTypeName = "docker"
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)
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// TODO: The admission logic in this file is runtime-dependent. It should be
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// changed to be generic and CRI-compatible.
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type runtimeAdmitHandler struct {
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result lifecycle.PodAdmitResult
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}
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var _ lifecycle.PodAdmitHandler = &runtimeAdmitHandler{}
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// NewRuntimeAdmitHandler returns a sysctlRuntimeAdmitHandler which checks whether
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// the given runtime support sysctls.
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func NewRuntimeAdmitHandler(runtime container.Runtime) (*runtimeAdmitHandler, error) {
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if runtime.Type() == dockerTypeName {
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v, err := runtime.APIVersion()
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if err != nil {
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return nil, fmt.Errorf("failed to get runtime version: %v", err)
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}
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// only Docker >= 1.12 supports sysctls
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c, err := v.Compare(dockerMinimumAPIVersion)
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if err != nil {
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return nil, fmt.Errorf("failed to compare Docker version for sysctl support: %v", err)
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}
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if c >= 0 {
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return &runtimeAdmitHandler{
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result: lifecycle.PodAdmitResult{
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Admit: true,
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},
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}, nil
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}
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return &runtimeAdmitHandler{
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result: lifecycle.PodAdmitResult{
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Admit: false,
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Reason: UnsupportedReason,
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Message: "Docker before 1.12 does not support sysctls",
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},
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}, nil
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}
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// for other runtimes like rkt sysctls are not supported
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return &runtimeAdmitHandler{
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result: lifecycle.PodAdmitResult{
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Admit: false,
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Reason: UnsupportedReason,
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Message: fmt.Sprintf("runtime %v does not support sysctls", runtime.Type()),
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},
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}, nil
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}
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// Admit checks whether the runtime supports sysctls.
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func (w *runtimeAdmitHandler) Admit(attrs *lifecycle.PodAdmitAttributes) lifecycle.PodAdmitResult {
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sysctls, unsafeSysctls, err := v1helper.SysctlsFromPodAnnotations(attrs.Pod.Annotations)
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if err != nil {
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return lifecycle.PodAdmitResult{
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Admit: false,
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Reason: AnnotationInvalidReason,
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Message: fmt.Sprintf("invalid sysctl annotation: %v", err),
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}
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}
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if len(sysctls)+len(unsafeSysctls) > 0 {
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return w.result
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}
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return lifecycle.PodAdmitResult{
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Admit: true,
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}
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}
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