#### preStop，pod停止前操作（优雅停止服务）
```
apiVersion: v1
kind: Pod

metadata:
  name: PreStop-demo-v1
  namespace: demo-ns
  labels:
    app: prestop
    version: v1

spec:
  containers:
  - name: prestop-demo
    image: busybox
    ports:
    - name: pre-port
      containerPort: 80
      protocol: TCP
    lifecycle:
      preStop:
        exec: ## httpGet 或 tcpSocket
          command:
          - '/bin/sh'
          - '-c'
          - 'echo stop'
```

#### postStart,pod启动前操作
```
apiVersion: v1
kind: Pod

metadata:
  name: PostStart-demo-v1
  namespace: demo-ns
  labels:
    app: poststart
    version: v1

spec:
  containers:
  - name: poststart-demo
    image: busybox
    ports:
    - name: post-port
      containerPort: 80
      protocol: TCP
  
    lifecycle:
      postStart:
        tcpSocket:
          port: 80
    
```