Kubernetes部署和初始化容器 [英] Kubernetes Deployments and Init Containers

问题描述

我最近了解到 Kubernetes具有称为初始化容器的功能.太好了，因为我可以使用此功能来等待我的postgres服务并在运行Web应用程序服务之前创建/迁移数据库.

I learned recently that Kubernetes has a feature called Init Containers. Awesome, because I can use this feature to wait for my postgres service and create/migrate the database before my web application service runs.

但是，似乎只能在Pod yaml文件中配置初始化容器.有什么办法可以通过Deployment yaml文件执行此操作?还是我必须选择?

However, it appears that Init Containers can only be configured in a Pod yaml file. Is there a way I can do this via a Deployment yaml file? Or do I have to choose?

推荐答案

为避免混淆，请回答您的特定问题.我同意oswin，您可能想考虑另一种方法.

To avoid confusion, ill answer your specific question. i agree with oswin that you may want to consider another method.

是的，您可以在部署中使用init容器.这是使用旧样式(1.6之前的版本)的示例，但应该可以使用

Yes, you can use init containers with a deployment. this is an example using the old style (pre 1.6) but it should work

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: 'nginx'
spec:
  replicas: 1
  selector:
    matchLabels:
      app: 'nginx'

  template:
    metadata:
      labels:
        app: 'nginx'
      annotations:
        pod.beta.kubernetes.io/init-containers: '[
            {
                "name": "install",
                "image": "busybox",
                "imagePullPolicy": "IfNotPresent",
                "command": ["wget", "-O", "/application/index.html", "http://kubernetes.io/index.html"],
                "volumeMounts": [
                    {
                      "name": "application",
                      "mountPath": "/application"
                    }
                ]
            }
        ]'
    spec:
      volumes:
        - name: 'application'
          emptyDir: {}

      containers:

      - name: webserver
        image: 'nginx'
        ports:
        - name: http
          containerPort: 80
        volumeMounts:
          - name: 'application'
            mountPath: '/application'

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