本文講的是使用rc滾動升級,

其他關於k8s的文字

https://kubernetes.io/docs/tasks/run-application/rolling-update-replication-controller/ 

你執行的是version 1.7.9 of nginx:

apiVersion: v1
kind: ReplicationController
metadata:
  name: my-nginx
spec:
  replicas: 5
  template:
    metadata:
      labels:
        app
 
: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80

$ kubectl rolling-update my-nginx --image=nginx:1.9.1
Created my-nginx-ccba8fbd8cc8160970f63f9a2696fc46

$ kubectl get pods -l app=nginx -L deployment
NAME                                              READY     STATUS    RESTARTS   AGE       DEPLOYMENT
my-nginx-ccba8fbd8cc8160970f63f9a2696fc46-k156z   1/1       Running   0          1m        ccba8fbd8cc8160970f63f9a2696fc46
my-nginx-ccba8fbd8cc8160970f63f9a2696fc46-v95yh   1/1       Running   0          35s       ccba8fbd8cc8160970f63f9a2696fc46
my-nginx-divi2                                    1/1       Running   0          2h        2d1d7a8f682934a254002b56404b813e
my-nginx-o0ef1                                    1/1       Running   0          2h        2d1d7a8f682934a254002b56404b813e
my-nginx-q6all                                    1/1       Running   0          8m        2d1d7a8f682934a254002b56404b813e
 

kubectl rolling-update 升級過程如下

Scaling up my-nginx-ccba8fbd8cc8160970f63f9a2696fc46 from 0 to 3, scaling down my-nginx from 3 to 0 (keep 3 pods available, don't exceed 4 pods)
Scaling my-nginx-ccba8fbd8cc8160970f63f9a2696fc46 up to 1
Scaling my-nginx down to 2
Scaling my-nginx-ccba8fbd8cc8160970f63f9a2696fc46 up to 2
Scaling my-nginx down to 1
Scaling my-nginx-ccba8fbd8cc8160970f63f9a2696fc46 up to 3
Scaling my-nginx down to 0
Update succeeded. Deleting old controller: my-nginx
Renaming my-nginx-ccba8fbd8cc8160970f63f9a2696fc46 to my-nginx
replicationcontroller "my-nginx" rolling updated
 

如果升級過程報錯了,你可以用 --rollback:

尼瑪,這裡怎麼會報錯?是建立pod的過程,如果建立新pod報錯,我估計新版的image問題吧,不應該到生產才發現啊.

$ kubectl rolling-update my-nginx --rollback
Setting "my-nginx" replicas to 1
Continuing update with existing controller my-nginx.
Scaling up nginx from 1 to 1, scaling down my-nginx-ccba8fbd8cc8160970f63f9a2696fc46 from 1 to 0 (keep 1 pods available, don't exceed 2 pods)
Scaling my-nginx-ccba8fbd8cc8160970f63f9a2696fc46 down to 0
Update succeeded. Deleting my-nginx-ccba8fbd8cc8160970f63f9a2696fc46
replicationcontroller "my-nginx" rolling updated

如果相對映象+啟動引數+環境變數升級,那你應該新建一個配置

apiVersion: v1
kind: ReplicationController
metadata:
  name: my-nginx-v4
spec:
  replicas: 5
  selector:
    app: nginx
    deployment: v4
  template:
    metadata:
      labels:
        app: nginx
        deployment: v4
    spec:
      containers:
      - name: nginx
        image: nginx:1.9.2
        args: ["nginx", "-T"]
        ports:
        - containerPort: 80

$ kubectl rolling-update my-nginx -f ./nginx-rc.yaml
Created my-nginx-v4
Scaling up my-nginx-v4 from 0 to 5, scaling down my-nginx from 4 to 0 (keep 4 pods available, don't exceed 5 pods)
Scaling my-nginx-v4 up to 1
Scaling my-nginx down to 3
Scaling my-nginx-v4 up to 2
Scaling my-nginx down to 2
Scaling my-nginx-v4 up to 3
Scaling my-nginx down to 1
Scaling my-nginx-v4 up to 4
Scaling my-nginx down to 0
Scaling my-nginx-v4 up to 5
Update succeeded. Deleting old controller: my-nginx
replicationcontroller "my-nginx-v4" rolling updated