Kubernetes 初始化容器顺序启动

最近工作中需要保证容器启动之前PostgreSQL先启动，然后Apollo再启动，不然会出现配置加载错误的问题。Kubernetes的初始化容器就能够满足这种场景。

InitContainers能够按照资源文件中初始化容器的顺序依次启动

apiVersion: apps/v1
kind: Deployment
metadata:
  name: openailab-discovery-service
  namespace: oas-uat
  labels:
    name: openailab-discovery-service
spec:
  replicas: 1
  selector:
    matchLabels:
      name: openailab-discovery-service
  template:
    metadata:
      labels:
        name: openailab-discovery-service
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: env
                operator: In
                values