bf2decce81
In many cases clients may wish to view not ready addresses for endpoints in order to do set membership prior to a pod being ready. For instance, a pod that uses the service endpoints to connect to other pods under the same service, but does not want to signal ready before it has contacted at least a minimal number of other pods. This is backwards compatible with old servers and clients. There is an additional cost in size of endpoints before services ramp up, which will add minor CPU and memory use for services that have a significant number of pods which have not become ready.
124 lines
3.8 KiB
Go
124 lines
3.8 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 container
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import (
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"hash/adler32"
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"strings"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/util"
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"k8s.io/kubernetes/third_party/golang/expansion"
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"github.com/golang/glog"
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)
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// HandlerRunner runs a lifecycle handler for a container.
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type HandlerRunner interface {
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Run(containerID string, pod *api.Pod, container *api.Container, handler *api.Handler) error
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}
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// RunContainerOptionsGenerator generates the options that necessary for
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// container runtime to run a container.
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type RunContainerOptionsGenerator interface {
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GenerateRunContainerOptions(pod *api.Pod, container *api.Container) (*RunContainerOptions, error)
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}
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// Trims runtime prefix from ID or image name (e.g.: docker://busybox -> busybox).
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func TrimRuntimePrefix(fullString string) string {
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const prefixSeparator = "://"
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idx := strings.Index(fullString, prefixSeparator)
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if idx < 0 {
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return fullString
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}
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return fullString[idx+len(prefixSeparator):]
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}
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// ShouldContainerBeRestarted checks whether a container needs to be restarted.
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// TODO(yifan): Think about how to refactor this.
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func ShouldContainerBeRestarted(container *api.Container, pod *api.Pod, podStatus *api.PodStatus, readinessManager *ReadinessManager) bool {
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podFullName := GetPodFullName(pod)
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// Get all dead container status.
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var resultStatus []*api.ContainerStatus
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for i, containerStatus := range podStatus.ContainerStatuses {
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if containerStatus.Name == container.Name && containerStatus.State.Terminated != nil {
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resultStatus = append(resultStatus, &podStatus.ContainerStatuses[i])
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}
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}
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// Set dead containers to notReady state.
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for _, c := range resultStatus {
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readinessManager.RemoveReadiness(TrimRuntimePrefix(c.ContainerID))
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}
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// Check RestartPolicy for dead container.
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if len(resultStatus) > 0 {
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if pod.Spec.RestartPolicy == api.RestartPolicyNever {
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glog.V(4).Infof("Already ran container %q of pod %q, do nothing", container.Name, podFullName)
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return false
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}
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if pod.Spec.RestartPolicy == api.RestartPolicyOnFailure {
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// Check the exit code of last run. Note: This assumes the result is sorted
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// by the created time in reverse order.
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if resultStatus[0].State.Terminated.ExitCode == 0 {
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glog.V(4).Infof("Already successfully ran container %q of pod %q, do nothing", container.Name, podFullName)
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return false
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}
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}
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}
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return true
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}
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// HashContainer returns the hash of the container. It is used to compare
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// the running container with its desired spec.
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func HashContainer(container *api.Container) uint64 {
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hash := adler32.New()
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util.DeepHashObject(hash, *container)
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return uint64(hash.Sum32())
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}
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// EnvVarsToMap constructs a map of environment name to value from a slice
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// of env vars.
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func EnvVarsToMap(envs []EnvVar) map[string]string {
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result := map[string]string{}
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for _, env := range envs {
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result[env.Name] = env.Value
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}
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return result
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}
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func ExpandContainerCommandAndArgs(container *api.Container, envs []EnvVar) (command []string, args []string) {
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mapping := expansion.MappingFuncFor(EnvVarsToMap(envs))
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if len(container.Command) != 0 {
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for _, cmd := range container.Command {
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command = append(command, expansion.Expand(cmd, mapping))
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}
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}
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if len(container.Args) != 0 {
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for _, arg := range container.Args {
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args = append(args, expansion.Expand(arg, mapping))
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}
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}
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return command, args
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}
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