关于Kubernetes-v1.23.6-资源调度-Deployment-版本的回滚

先看一下，当前笔者这里的k8s环境，主要是 deployment，rs ，pods 相关的信息

[root@k8s-master qq-5201351]# kubectl get deploy
NAME           READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deploy   3/3     3            3           24h
[root@k8s-master qq-5201351]#
[root@k8s-master qq-5201351]# kubectl get rs
NAME                      DESIRED   CURRENT   READY   AGE
nginx-deploy-754898b577   3         3         3       24h
nginx-deploy-78d8bf4fd7   0         0         0       24h
[root@k8s-master qq-5201351]#
[root@k8s-master qq-5201351]# kubectl get po
NAME                            READY   STATUS    RESTARTS      AGE
nginx-deploy-754898b577-dpbc2   1/1     Running   1 (24h ago)   24h
nginx-deploy-754898b577-mzhvg   1/1     Running   1 (24h ago)   24h
nginx-deploy-754898b577-pf7gp   1/1     Running   1 (24h ago)   24h

此时已经有2个rs版本信息了，接入来，我们制造环境，再增加一个rs版本，依然使用最简单的修改镜像的版本，并进行历史版本的查看

[root@k8s-master ~]# kubectl set image deployment/nginx-deploy nginx=nginx:1.9.12 --record=true
Flag --record has been deprecated, --record will be removed in the future
deployment.apps/nginx-deploy image updated

[root@k8s-master ~]# kubectl rollout history deployment/nginx-deploy
deployment.apps/nginx-deploy
REVISION  CHANGE-CAUSE
2         <none>
3         <none>
4         kubectl set image deployment/nginx-deploy nginx=nginx:1.9.12 --record=true

我们再次观察 ，deployment，rs ，pods 相关的信息，发现变化的主要就是rs和pod

[root@k8s-master ~]# kubectl get deploy
NAME           READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deploy   3/3     3            3           25h
[root@k8s-master ~]# kubectl get rs
NAME                      DESIRED   CURRENT   READY   AGE
nginx-deploy-754898b577   0         0         0       25h
nginx-deploy-78d8bf4fd7   0         0         0       25h
nginx-deploy-8d945596c    3         3         3       3m28s
[root@k8s-master ~]# kubectl get po
NAME                           READY   STATUS    RESTARTS   AGE
nginx-deploy-8d945596c-48bnj   1/1     Running   0          5m25s
nginx-deploy-8d945596c-fnthg   1/1     Running   0          6m50s
nginx-deploy-8d945596c-lqvqf   1/1     Running   0          8m23s

此时，如果要回滚到上一个版本（REVISION，数字越大，代表的版本越新）：

也可以先，查看变更的段，只会显示变改的块相关的内容

[root@k8s-master ~]# kubectl rollout history deployment/nginx-deploy --revision 2
deployment.apps/nginx-deploy with revision #2
Pod Template:
  Labels:       app=nginx-deploy
        pod-template-hash=754898b577
  Containers:
   nginx:
    Image:      nginx:1.9.1
    Port:       <none>
    Host Port:  <none>
    Environment:        <none>
    Mounts:     <none>
  Volumes:      <none>

[root@k8s-master ~]#

现在开始回滚到上一个版本：即nginx:1.9.1

kubectl rollout undo deployment/nginx-deploy --to-revision=2

执行后，我们可以再观察一下 deployment, rs , pods 相关的信息

[root@k8s-master ~]# kubectl rollout undo deployment/nginx-deploy --to-revision=2
deployment.apps/nginx-deploy rolled back
[root@k8s-master ~]# kubectl get deployments
NAME           READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deploy   3/3     3            3           25h
[root@k8s-master ~]# kubectl get rs
NAME                      DESIRED   CURRENT   READY   AGE
nginx-deploy-754898b577   3         3         3       25h
nginx-deploy-78d8bf4fd7   0         0         0       25h
nginx-deploy-8d945596c    0         0         0       13m
[root@k8s-master ~]# kubectl get pods
NAME                            READY   STATUS    RESTARTS   AGE
nginx-deploy-754898b577-d6kmr   1/1     Running   0          22s
nginx-deploy-754898b577-qd25d   1/1     Running   0          23s
nginx-deploy-754898b577-sk9pc   1/1     Running   0          21s

我们还可以通过 kubectl get deployments -o yaml 看出回退的效果，看看当前的nginx镜像的版本是不是之前的版本

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