kubernetes pod 启动顺序依赖

apiVersion: apps/v1
kind: Deployment
metadata:
  name: wordpress-sre
  labels:
    app: wordpress-sre
spec:
  selector:
    matchLabels:
      app: wordpress-sre
  minReadySeconds: 5
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  template:
    metadata:
      labels:
        app: wordpress-sre
    spec:
      initContainers:
      - name: init-db
        image: busybox
        #判断mysql-sre这个服务有没有正常，否则本容器不初始化
        command: ['sh', '-c', 'until nslookup mysql-sre; do echo waiting for mysql service; sleep 2; done;']
      containers:
      - name: wordpress
        image: wordpress
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
          name: wdport
...