Kubernetes | 是否有任何可用于Pod重新启动的钩子？

Question

Pod生命周期事件是否有任何可用的钩子？具体来说，我想运行一个命令以在Pod重新启动时上传日志。

Answer 1

编辑：PreStop挂钩不适用于容器重启-请参阅下面的其余答案

站在文档中时，有PreStop和PostStart事件，您可以附加它们。

来自文档的示例：

apiVersion: v1
kind: Pod
metadata:
  name: lifecycle-demo
spec:
  containers:
  - name: lifecycle-demo-container
    image: nginx
    lifecycle:
      postStart:
        exec:
          command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /usr/share/message"]
      preStop:
        exec:
          command: ["/bin/sh","-c","nginx -s quit; while killall -0 nginx; do sleep 1; done"]

编辑：所以我检查以下POC是否在容器崩溃时执行了preStop挂钩，结论是：NOT

apiVersion: v1
kind: Pod
metadata:
  name: lifecycle-demo
spec:
  containers:
  - name: lifecycle-demo-container
    volumeMounts:
    - mountPath: /data
      name: test-volume
    image: nginx
    command: ["/bin/sh"]
    args: ["-c", "sleep 5; exit 1"]
    lifecycle:
      postStart:
        exec:
          command: ["/bin/sh", "-c", "echo Hello from the postStart handler > /data/postStart"]
      preStop:
        exec:
          command: ["/bin/sh","-c","echo preStop handler! > /data/preStop"]

  volumes:
  - name: test-volume
    hostPath:
      path: /data
      type: Directory

作为您的解决方案，我建议采用以下方式为您的容器覆盖命令部分：

command: ["/bin/sh"]
args: ["-c", "your-application-executable; your-logs-upload"]

因此，您的日志上传可执行文件将在您的应用程序可执行崩溃/结束后执行