部署未检测到init-container中容器图像标记的更改

Question

我一直在使用init-containers,因为它们变得可用并且发现它们非常有用.我的核心映像(下面作为web-dev)没有太大变化,但我的init-container映像(下面作为web-data-dev)确实经常更改.

init-container使用带有版本号的容器映像.我将此版本号更改为最新值,然后执行kubectl apply -f deployment.yaml

例如,在运行kubectl apply之前,我将eu.gcr.io/project/web-data-dev:187更改为eu.gcr.io/project/web-data-dev:188.

然而,当我这样做时,没有发生部署,如果我对init-container使用的映像进行任何更改,部署仍然不会发生.我认为这是因为没有检测到init-container更改.

然后我试图在图像字段中放入一些垃圾,如下所示:"image":"thisIsNotAnImage"并再次运行kubectl apply -f,但仍未应用更新.

我的问题是 - 如何使用kubectl apply -f检测init-container中的图像标签更改？我做错了什么,这是一个错误,还是这还没有实现,因为init-containers是Alpha？

完整部署YAML如下.

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: web-deployment
spec:
  replicas: 1
  strategy:
    rollingUpdate:
      maxUnavailable: 0
  template:
    metadata:
      labels:
        app: web
        tier: frontend
      annotations:
        pod.alpha.kubernetes.io/init-containers: '[
            {
                "name": "initialiser1",
                "image": "eu.gcr.io/project/web-data-dev:187",
                "command": ["cp", "-r", "/data-in/", "/opt/"],
                "volumeMounts": [
                    {
                        "name": "file-share",
                        "mountPath": "/opt/"
                    }
                ]
            }
        ]'
    spec:
      containers:

        - image: eu.gcr.io/project/web-dev:20
          name: web
          resources:
            requests:
              cpu: 10m
              memory: 40Mi
          ports:
            - containerPort: 80
              name: http
            - containerPort: 443
              name: https
          volumeMounts:
            - name: file-share
              mountPath: /opt/

      volumes:
        - name: file-share
          emptyDir: {}

Answer 1

如果您使用的是Kubernetes 1.4,请尝试更改pod.alpha.kubernetes.io/init-containers为pod.beta.kubernetes.io/init-containers.

我在GitHub上找不到合适的问题,但这两个注释的行为是不同的.我可以kubectl apply -f使用第二个,部署将更新.

您可以使用以下示例进行测试:

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: nginx
spec:
  template:
    metadata:
      labels:
        app: nginx
      annotations:
        pod.beta.kubernetes.io/init-containers: '[
            {
                "name": "install",
                "image": "busybox",
                "command": ["/bin/sh", "-c", "echo foo > /work-dir/index.html"],
                "volumeMounts": [
                  {
                    "name": "workdir",
                    "mountPath": "/work-dir"
                    }
                ]
            }
        ]'
    spec:
      volumes:
        - name: workdir
          emptyDir: {}
      containers:
        - name: nginx
          image: nginx
          ports:
            - containerPort: 80
          volumeMounts:
            - name: workdir
              mountPath: /usr/share/nginx/html

尝试改变foo到bar和看到的结果:

$ cat nginx.yaml | kubectl apply -f -
deployment "nginx" created
$ curl $(minikube service nginx --url)
Waiting, endpoint for service is not ready yet...
foo
$ cat nginx.yaml | sed -e 's/foo/bar/g' | kubectl apply -f -
deployment "nginx" configured
$ curl $(minikube service nginx --url)
Waiting, endpoint for service is not ready yet...
bar

使用相同的东西pod.alpha.kubernetes.io/init-containers:

$ curl $(minikube service nginx --url)
Waiting, endpoint for service is not ready yet...
foo
$ cat nginx.yaml | sed -e 's/foo/bar/g' | kubectl apply -f -
deployment "nginx" configured
$ curl $(minikube service nginx --url)
foo