5.3 执行滚动升级

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-deploy
spec:
  replicas: 10
  selector:
    matchLabels:
      app: hello-world
  minReadySeconds: 10
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
      maxSurge: 1
  template:
    metadata:
      labels:
        app: hello-world
    spec:
      containers:
      - name: hello-pod
        image: nigelpoulton/k8sbook:edge
        ports:
        - containerPort: 8080

更改上面deploy.yaml里面的image的版本

kubectl apply -f deploy.yml --record

当你使用 kubectl apply -f deploy.yml --record 命令时，你正在应用或更新（如果资源已存在）由 deploy.yml 文件定义的 Kubernetes 资源，并且通过 --record 参数，Kubernetes 会记录此次更改的详细信息，这样之后你可以更容易地追踪资源的变更历史

[root@master k8s]# kubectl apply -f deploy.yml --record
deployment.apps/hello-deploy configured

kubectl rollout status deployment hello-deploy

可以看到正在依次更新

kubectl rollout status deployment hello-deploy
Waiting for deployment "hello-deploy" rollout to finish: 3 out of 10 new replicas have been updated...
Waiting for deployment "hello-deploy" rollout to finish: 3 out of 10 new replicas have been updated...
Waiting for deployment "hello-deploy" rollout to finish: 3 out of 10 new replicas have been updated...
Waiting for deployment "hello-deploy" rollout to finish: 3 out of 10 new replicas have been updated...
Waiting for deployment "hello-deploy" rollout to finish: 4 out of 10 new replicas have been updated...
Waiting for deployment "hello-deploy" rollout to finish: 4 out of 10 new replicas have been updated...