Kubernetes基础：使用rollout对Deployment进行控制

妖狐艹你老母 2023-07-04 03:29 5阅读 0赞

kubectl rollout可以对Deployment、DaemonSet和StatefulSet进行控制，这篇文章以Deployment为例，对控制方式进行说明。

# rollout常见操作 #

<table> 
 <thead> 
  <tr> 
   <th>子命令</th> 
   <th>功能说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>history</td> 
   <td>查看rollout操作历史</td> 
  </tr> 
  <tr> 
   <td>pause</td> 
   <td>将提供的资源设定为暂停状态</td> 
  </tr> 
  <tr> 
   <td>restart</td> 
   <td>重启某资源</td> 
  </tr> 
  <tr> 
   <td>resume</td> 
   <td>将某资源从暂停状态恢复正常</td> 
  </tr> 
  <tr> 
   <td>status</td> 
   <td>查看rollout操作状态</td> 
  </tr> 
  <tr> 
   <td>undo</td> 
   <td>回滚前一rollout</td> 
  </tr> 
 </tbody> 
</table>

# 事前准备 #

使用如下YAML文件创建Deployment

[root@host131 Deployment]# cat v1.yaml 
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: busybox-deployment-v1
    spec:
      replicas: 3
      selector:
        matchLabels:
          app: busybox-v1
      template:
        metadata:
          labels:
            app: busybox-v1
        spec:
          containers:
          - name: busybox-host
            image: busybox:1.31.1
            command: ["sleep"]
            args: ["1000"]
    ...
    [root@host131 Deployment]#

创建Deployment并确认

[root@host131 Deployment]# kubectl create -f v1.yaml 
    deployment.apps/busybox-deployment-v1 created
    [root@host131 Deployment]# kubectl get deployment -o wide
    NAME                    READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS     IMAGES           SELECTOR
    busybox-deployment-v1   3/3     3            3           7s    busybox-host   busybox:1.31.1   app=busybox-v1
    [root@host131 Deployment]# kubectl get pods -o wide
    NAME                                     READY   STATUS    RESTARTS   AGE   IP             NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-7bfdbd9656-ch65w   1/1     Running   0          14s   10.254.152.6   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7bfdbd9656-f68s2   1/1     Running   0          14s   10.254.152.5   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7bfdbd9656-s6f6j   1/1     Running   0          14s   10.254.152.7   192.168.163.131   <none>           <none>
    [root@host131 Deployment]# kubectl exec -it busybox-deployment-v1-7bfdbd9656-ch65w sh
    / # ps -ef
    PID   USER     TIME  COMMAND
        1 root      0:00 sleep 1000
        6 root      0:00 sh
       11 root      0:00 ps -ef
    / # busybox |grep BusyBox
    BusyBox v1.31.1 (2019-12-23 19:20:27 UTC) multi-call binary.
    BusyBox is copyrighted by many authors between 1998-2015.
    	BusyBox is a multi-call binary that combines many common Unix
    	link to busybox for each function they wish to use and BusyBox
    / #

# 操作之：history #

<table> 
 <thead> 
  <tr> 
   <th>子命令</th> 
   <th>功能说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>history</td> 
   <td>查看rollout操作历史</td> 
  </tr> 
 </tbody> 
</table>

[root@host131 Deployment]# kubectl rollout history deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 
    REVISION  CHANGE-CAUSE
    1         <none>
    
    [root@host131 Deployment]#

# 操作之：status #

<table> 
 <thead> 
  <tr> 
   <th>子命令</th> 
   <th>功能说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>status</td> 
   <td>查看rollout操作状态</td> 
  </tr> 
 </tbody> 
</table>

[root@host131 Deployment]# kubectl rollout status deployment busybox-deployment-v1
    deployment "busybox-deployment-v1" successfully rolled out
    [root@host131 Deployment]#

# 操作之：pause #

<table> 
 <thead> 
  <tr> 
   <th>子命令</th> 
   <th>功能说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>pause</td> 
   <td>将提供的资源设定为暂停状态</td> 
  </tr> 
 </tbody> 
</table>

[root@host131 Deployment]# kubectl rollout pause deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 paused
    [root@host131 Deployment]#

可以通过describe命令确认到Progressing的状态：

[root@host131 Deployment]# kubectl describe deployment busybox-deployment-v1 |grep Progressing
      Progressing    Unknown  DeploymentPaused
    [root@host131 Deployment]#

# 操作之：resume #

<table> 
 <thead> 
  <tr> 
   <th>子命令</th> 
   <th>功能说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>resume</td> 
   <td>将某资源从暂停状态恢复正常</td> 
  </tr> 
 </tbody> 
</table>

[root@host131 Deployment]# kubectl rollout resume deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 resumed
    [root@host131 Deployment]#

可以通过describe命令确认到Progressing的状态：

[root@host131 Deployment]# kubectl describe deployment busybox-deployment-v1 |grep Progressing
      Progressing    True    NewReplicaSetAvailable
    [root@host131 Deployment]#

# 操作之：restart #

<table> 
 <thead> 
  <tr> 
   <th>子命令</th> 
   <th>功能说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>restart</td> 
   <td>重启某资源</td> 
  </tr> 
 </tbody> 
</table>

[root@host131 Deployment]# kubectl get deployment -o wide
    NAME                    READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS     IMAGES           SELECTOR
    busybox-deployment-v1   3/3     3            3           10m   busybox-host   busybox:1.31.1   app=busybox-v1
    [root@host131 Deployment]# kubectl get pods -o wide
    NAME                                     READY   STATUS    RESTARTS   AGE   IP             NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-7bfdbd9656-ch65w   1/1     Running   0          10m   10.254.152.6   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7bfdbd9656-f68s2   1/1     Running   0          10m   10.254.152.5   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7bfdbd9656-s6f6j   1/1     Running   0          10m   10.254.152.7   192.168.163.131   <none>           <none>
    [root@host131 Deployment]# kubectl rollout history deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 
    REVISION  CHANGE-CAUSE
    1         <none>
    
    [root@host131 Deployment]# 
    [root@host131 Deployment]# kubectl rollout restart deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 restarted
    [root@host131 Deployment]# kubectl rollout status deployment busybox-deployment-v1
    Waiting for deployment "busybox-deployment-v1" rollout to finish: 1 old replicas are pending termination...
    Waiting for deployment "busybox-deployment-v1" rollout to finish: 1 old replicas are pending termination...
    deployment "busybox-deployment-v1" successfully rolled out
    [root@host131 Deployment]# kubectl rollout history deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 
    REVISION  CHANGE-CAUSE
    1         <none>
    2         <none>
    
    [root@host131 Deployment]# kubectl get deployment -o wide
    NAME                    READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS     IMAGES           SELECTOR
    busybox-deployment-v1   3/3     3            3           11m   busybox-host   busybox:1.31.1   app=busybox-v1
    [root@host131 Deployment]# kubectl get pods -o wide
    NAME                                     READY   STATUS        RESTARTS   AGE   IP              NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-7bfdbd9656-ch65w   1/1     Terminating   0          11m   10.254.152.6    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7bfdbd9656-f68s2   1/1     Terminating   0          11m   10.254.152.5    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7bfdbd9656-s6f6j   1/1     Terminating   0          11m   10.254.152.7    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-kjt5z    1/1     Running       0          25s   10.254.152.10   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-r9xjk    1/1     Running       0          29s   10.254.152.8    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-vnnhx    1/1     Running       0          27s   10.254.152.9    192.168.163.131   <none>           <none>
    [root@host131 Deployment]#

# 操作之：undo #

<table> 
 <thead> 
  <tr> 
   <th>子命令</th> 
   <th>功能说明</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>undo</td> 
   <td>回滚前一rollout</td> 
  </tr> 
 </tbody> 
</table>

*  回滚前状态确认

[root@host131 Deployment]# kubectl get pods -o wide
    NAME                                    READY   STATUS    RESTARTS   AGE   IP              NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-7c6899456-kjt5z   1/1     Running   0          66s   10.254.152.10   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-r9xjk   1/1     Running   0          70s   10.254.152.8    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-vnnhx   1/1     Running   0          68s   10.254.152.9    192.168.163.131   <none>           <none>
    [root@host131 Deployment]# kubectl exec -it busybox-deployment-v1-7c6899456-kjt5z sh
    / # ps -ef
    PID   USER     TIME  COMMAND
        1 root      0:00 sleep 1000
        6 root      0:00 sh
       11 root      0:00 ps -ef
    / # busybox |grep BusyBox
    BusyBox v1.31.1 (2019-12-23 19:20:27 UTC) multi-call binary.
    BusyBox is copyrighted by many authors between 1998-2015.
    	BusyBox is a multi-call binary that combines many common Unix
    	link to busybox for each function they wish to use and BusyBox
    / #

*  修改配置文件  
    修改启动命令的sleep时间以及busybox的版本，详细如下所示

[root@host131 Deployment]# cat v1.yaml 
    ---
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: busybox-deployment-v1
    spec:
      replicas: 3
      selector:
        matchLabels:
          app: busybox-v1
      template:
        metadata:
          labels:
            app: busybox-v1
        spec:
          containers:
          - name: busybox-host
            image: busybox:1.30.1
            command: ["sleep"]
            args: ["10000"]
    ...
    [root@host131 Deployment]#

*  修改当前Deployment和Pod信息

[root@host131 Deployment]# kubectl apply -f v1.yaml 
    Warning: kubectl apply should be used on resource created by either kubectl create --save-config or kubectl apply
    deployment.apps/busybox-deployment-v1 configured
    [root@host131 Deployment]# 
    [root@host131 Deployment]# kubectl get deployment -o wide
    NAME                    READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS     IMAGES           SELECTOR
    busybox-deployment-v1   3/3     3            3           15m   busybox-host   busybox:1.30.1   app=busybox-v1
    [root@host131 Deployment]# kubectl get pods -o wide
    NAME                                     READY   STATUS        RESTARTS   AGE     IP              NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-5fd9b98ccc-9h6gd   1/1     Running       0          17s     10.254.152.6    192.168.163.131   <none>           <none>
    busybox-deployment-v1-5fd9b98ccc-l67nw   1/1     Running       0          15s     10.254.152.7    192.168.163.131   <none>           <none>
    busybox-deployment-v1-5fd9b98ccc-vfkdv   1/1     Running       0          19s     10.254.152.5    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-kjt5z    1/1     Terminating   0          4m25s   10.254.152.10   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-r9xjk    1/1     Terminating   0          4m29s   10.254.152.8    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-vnnhx    1/1     Terminating   0          4m27s   10.254.152.9    192.168.163.131   <none>           <none>
    [root@host131 Deployment]# 
    [root@host131 Deployment]# kubectl get pods -o wide
    NAME                                     READY   STATUS    RESTARTS   AGE   IP             NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-5fd9b98ccc-9h6gd   1/1     Running   0          45s   10.254.152.6   192.168.163.131   <none>           <none>
    busybox-deployment-v1-5fd9b98ccc-l67nw   1/1     Running   0          43s   10.254.152.7   192.168.163.131   <none>           <none>
    busybox-deployment-v1-5fd9b98ccc-vfkdv   1/1     Running   0          47s   10.254.152.5   192.168.163.131   <none>           <none>
    [root@host131 Deployment]# kubectl exec -it busybox-deployment-v1-5fd9b98ccc-9h6gd sh
    / # ps -ef
    PID   USER     TIME  COMMAND
        1 root      0:00 sleep 10000
        6 root      0:00 sh
       11 root      0:00 ps -ef
    / # busybox |grep BusyBox
    BusyBox v1.30.1 (2019-05-09 01:23:43 UTC) multi-call binary.
    BusyBox is copyrighted by many authors between 1998-2015.
    	BusyBox is a multi-call binary that combines many common Unix
    	link to busybox for each function they wish to use and BusyBox
    / #

查看历史信息

[root@host131 Deployment]# kubectl rollout history deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 
    REVISION  CHANGE-CAUSE
    1         <none>
    2         <none>
    3         <none>
    
    [root@host131 Deployment]#

*  回滚  
    此处使用不带参数的回滚，表示回滚至上一个版本，也可以指定回滚的具体版本

[root@host131 Deployment]# kubectl rollout undo deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 rolled back
    [root@host131 Deployment]# kubectl rollout status deployment busybox-deployment-v1
    deployment "busybox-deployment-v1" successfully rolled out
    [root@host131 Deployment]# kubectl rollout history deployment busybox-deployment-v1
    deployment.apps/busybox-deployment-v1 
    REVISION  CHANGE-CAUSE
    1         <none>
    3         <none>
    4         <none>
    
    [root@host131 Deployment]#

*  回滚结果确认

[root@host131 Deployment]# kubectl get deployment -o wide
    NAME                    READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS     IMAGES           SELECTOR
    busybox-deployment-v1   3/3     3            3           19m   busybox-host   busybox:1.31.1   app=busybox-v1
    [root@host131 Deployment]# 
    [root@host131 Deployment]# kubectl get pods -o wide
    NAME                                     READY   STATUS        RESTARTS   AGE     IP              NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-5fd9b98ccc-l67nw   0/1     Terminating   0          4m10s   10.254.152.7    192.168.163.131   <none>           <none>
    busybox-deployment-v1-5fd9b98ccc-vfkdv   0/1     Terminating   0          4m14s   <none>          192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-2qbgc    1/1     Running       0          36s     10.254.152.9    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-cwpw7    1/1     Running       0          34s     10.254.152.10   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-qzh44    1/1     Running       0          39s     10.254.152.8    192.168.163.131   <none>           <none>
    [root@host131 Deployment]# 
    [root@host131 Deployment]# kubectl get pods -o wide
    NAME                                    READY   STATUS    RESTARTS   AGE   IP              NODE              NOMINATED NODE   READINESS GATES
    busybox-deployment-v1-7c6899456-2qbgc   1/1     Running   0          59s   10.254.152.9    192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-cwpw7   1/1     Running   0          57s   10.254.152.10   192.168.163.131   <none>           <none>
    busybox-deployment-v1-7c6899456-qzh44   1/1     Running   0          62s   10.254.152.8    192.168.163.131   <none>           <none>
    [root@host131 Deployment]# kubectl exec -it busybox-deployment-v1-7c6899456-2qbgc sh
    / # ps -ef
    PID   USER     TIME  COMMAND
        1 root      0:00 sleep 1000
        6 root      0:00 sh
       11 root      0:00 ps -ef
    / # busybox |grep BusyBox
    BusyBox v1.31.1 (2019-12-23 19:20:27 UTC) multi-call binary.
    BusyBox is copyrighted by many authors between 1998-2015.
    	BusyBox is a multi-call binary that combines many common Unix
    	link to busybox for each function they wish to use and BusyBox
    / #