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3.4.23. lifecycle选项

hook都是container级别。

postStart

在container启动时执行，不是container启动前执行，没有先后顺序。

apiVersion: v1
kind: Pod
metadata:
  name: pod-with-poststart-hook 
spec:
  containers:
  - image: luksa/kubia
    name: kubia
    lifecycle:
      postStart:
        exec:
          command:
          - sh
          - -c
          - "echo 'hook will fail with exit code 15'; sleep 5; exit 15"

preStop

apiVersion: v1
kind: Pod
metadata:
  name: pod-with-poststart-hook 
spec:
  containers:
  - image: luksa/kubia
    name: kubia
    lifecycle:
      preStop:
        httpGet:        # This is a pre-stop hook that performs an HTTP GET request.
          port: 8080    # The request is sent to http://POD_IP:8080/shutdown.
          path: shutdown

Pod停止前相关事件:

1. Run the pre-stop hook, if one is configured, and wait for it to finish.
2. Send the SIGTERM signal to the main process of the container.
3. Wait until the container shuts down cleanly or until the termination grace
period runs out.
4. Forcibly kill the process with SIGKILL, if it hasn’t terminated gracefully yet.

优雅停止的时间间隔:

可通过spec.terminationGracePeriodSeconds指定，单位秒，默认是30

指定为优雅停止间隔为:5秒
$ kubectl delete po mypod --grace-period=5

强制删除, 不优雅停止
$ kubectl delete po mypod --grace-period=0 --force

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