【转帖】K8S Deployment 命令

K8S Deployment 命令

https://www.cnblogs.com/Tempted/p/7831604.html

今天学习了一下 

kubectl scale deployment  xxxx replicas=

创建 Deployment

kubectl create -f https://kubernetes.io/docs/user-guide/nginx-deployment.yaml --record
deployment "nginx-deployment" created

将kubectl的 --record 的 flag 设置为 true可以在 annotation 中记录当前命令创建或者升级了该资源。这在未来会很有用，例如，查看在每个 Deployment revision 中执行了哪些命令。

然后立即执行 get 将获得如下结果：

kubectl get deployment  

NAME                  DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
alpine-fbgweb         1         1         1            1           12h
alpine-lnp            1         1         1            1           3d
demo-deployment       3         3         3            3           15h
jenkins               1         1         1            1           3d
nginx-dm              2         2         2            2           13d
nginx1-7-deployment   1         1         1            1           15h
nginx1-8-deployment   1         1         1            1           15h

更新Deployment

扩容：

kubectl scale deployment nginx-deployment --replicas 10

如果集群支持 horizontal pod autoscaling 的话，还可以为Deployment设置自动扩展：

kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80 

更新镜像也比较简单:

kubectl set image deployment/nginx-deployment nginx=nginx:1.9.1

回滚到上一个版本：

kubectl rollout undo deployment/nginx-deployment

也可以使用 --revision参数指定某个历史版本：

 kubectl rollout undo deployment/nginx-deployment --to-revision=2
deployment "nginx-deployment" rolled back

历史记录

kubectl rollout history deployment/alpine-fbgweb

REVISION        CHANGE-CAUSE
1               kubectl apply --filename=/data/scripts/app/fbgweb.yaml --record=true
2               kubectl apply --filename=/data/scripts/app/fbgweb.yaml --record=true

创建 Deployment 的时候使用了--record参数可以记录命令，我们可以很方便的查看每次 revision 的变化。

查看单个revision 的详细信息：

kubectl rollout history deployment alpine-fbgweb --revision=1

[root@master scripts]# kubectl rollout history deployment alpine-fbgweb --revision=1
deployments "alpine-fbgweb" with revision #1
Pod Template:
  Labels:       app=alpine-fbgweb
        pod-template-hash=469852024
  Annotations:  kubernetes.io/change-cause=kubectl apply --filename=/data/scripts/app/fbgweb.yaml --record=true
  Containers:
   alpine-fbgweb:
    Image:      192.168.0.153:5000/fbgweb:2017-11-13-13-49-30
    Port:       80/TCP
    Environment:        <none>
    Mounts:
      /etc/localtmie from tz-config (rw)
  Volumes:
   tz-config:
    Type:       HostPath (bare host directory volume)
    Path:       /usr/share/zoneinfo/Asia/Shanghai