Kubernetes:初始化后运行命令

Question

我希望在部署初始化成功后运行特定命令.

这是我的yaml文件:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: auth
spec:
  replicas: 1
  template:
    metadata:
        labels:
          app: auth
    spec:
      containers:
        - name: auth
          image: {{my-service-image}}
          env:
          - name: NODE_ENV
            value: "docker-dev"
          resources:
            requests:
              cpu: 100m
              memory: 100Mi
          ports:
            - containerPort: 3000

但是,我想在成功初始化部署并且正在运行pod之后(之前)运行db迁移命令.

我可以手动为每个pod(使用kubectl exec),但这不是很可扩展.

Answer 1

我使用生命周期解决了它:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: auth
spec:
  replicas: 1
  template:
    metadata:
        labels:
          app: auth
    spec:
      containers:
        - name: auth
          image: {{my-service-image}}
          env:
          - name: NODE_ENV
            value: "docker-dev"
          resources:
            requests:
              cpu: 100m
              memory: 100Mi
          ports:
            - containerPort: 3000
          lifecycle:
            postStart:
              exec:
                command: ["/bin/sh", "-c", {{cmd}}]

Answer 2

您可以使用Helm部署一组Kubernetes资源。然后，使用Helm hook（例如post-install或）在单独的Docker容器中post-upgrade运行Job。将您的Job设置为调用数据库迁移。作业将运行> = 1吊舱才能完成，因此非常适合此处。