|NO.Z.00137|——————————|CloudNative|——|KuberNetes&资源调度.V07|----------

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[CloudNative：KuberNetes&资源调度.V07]                                                               [Applications.KuberNetes]

[|DevOps|k8s|资源调度|无状态应用管理|Deployment|deployment创建|deployment更新|]

[deployment回滚|deployment扩容和缩容|deployment更新暂停和恢复|deployment更新注意事项|]

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一、deployment暂停和恢复

### --- deployment暂停恢复概述

~~~     使用edit命令可以同时修改多个参数，统一去保存的。
~~~     使用set命令多次修改它的配置，只触发一次更新呢？
~~~     可以使用呢Deployment的暂停功能，就是多次执行deployment的更新给暂停掉，
~~~     多次去修改它的参数，然后再把它的暂停给恢复
~~~     这个就实现了使用set多次执行命令只触发一次的操作。

二、deployment暂停

### --- 暂停deployment的更新，比如以nginx为例

[root@k8s-master01 ~]# kubectl rollout pause deployment nginx 
deployment.apps/nginx paused

### --- deployment暂停后修改配置参数

~~~     # 第一次修改：修改它的一些配置
[root@k8s-master01 ~]# kubectl set image deploy nginx nginx=nginx:1.15.3 --record
deployment.apps/nginx image updated 
[root@k8s-master01 ~]# kubectl get po                                               //可以看到它没有被更新，因为我们已经暂停了deployment的更新操作
NAME                     READY   STATUS    RESTARTS   AGE
nginx-6cdd5dd489-rsf6k   1/1     Running   0          133m
nginx-6cdd5dd489-sfdzr   1/1     Running   0          131m

~~~     # 第二次修改：添加内存和CPU配置

[root@k8s-master01 ~]# kubectl set resources deploy nginx -c nginx --limits=cpu=200m,memory=128Mi --requests=cpu=10m,memory=16Mi
deployment.apps/nginx resource requirements updated
[root@k8s-master01 ~]# kubectl get deploy nginx -oyaml 
    spec:
      containers:
      - image: nginx:1.15.3
        imagePullPolicy: IfNotPresent
        name: nginx
        resources:                                                                  //启动容器使用最大的内存和CPU的使用量
          limits:
            cpu: 200m
            memory: 128Mi
          requests:                                                                 //启动容器使用最小的内存和CPU的使用量
            cpu: 10m
            memory: 16Mi

### --- 修改配置后在暂停状态下pod是不会被更新的
~~~     查看pod是否被更新 
~~~     在暂停状态下pod是不会发生任何更新的

[root@k8s-master01 ~]# kubectl get po                               
NAME                     READY   STATUS    RESTARTS   AGE
nginx-6cdd5dd489-rsf6k   1/1     Running   0          139m
nginx-6cdd5dd489-sfdzr   1/1     Running   0          136m

三、deployment恢复

### --- 恢复更新，查看pod更新状态
~~~     恢复更新

[root@k8s-master01 ~]# kubectl rollout resume deploy nginx
deployment.apps/nginx resumed

### --- 查看pod更新记录，rs生成记录
~~~     查看rs记录

[root@k8s-master01 ~]# kubectl get rs                                               //可以看到恢复更新之后创建了一个新的RS
NAME               DESIRED   CURRENT   READY   AGE
nginx-5788dd5dcd   0         0         0       119m
nginx-5dfc8689c6   0         0         0       152m
nginx-65468bc655   0         0         0       119m
nginx-66bbc9fdc5   0         0         0       5h14m
nginx-68db656dd8   1         1         0       3s

### --- 查看pod更新记录

[root@k8s-master01 ~]# kubectl get po                                               //修改了2次，所以创建了2个新的Pod。但最终只会留下一个，历史的会被执行后删除
NAME                     READY   STATUS              RESTARTS   AGE
nginx-68db656dd8-df8xn   1/1     Running             0          7s
nginx-68db656dd8-fdw4k   0/1     ContainerCreating   0          2s
nginx-6cdd5dd489-rsf6k   1/1     Running             0          139m
nginx-6cdd5dd489-sfdzr   1/1     Terminating         0          137m

[root@k8s-master01 ~]# kubectl get po
NAME                     READY   STATUS              RESTARTS   AGE
nginx-68db656dd8-df8xn   1/1     Running             0          23s
nginx-68db656dd8-fdw4k   0/1     ContainerCreating   0          18s
nginx-6cdd5dd489-rsf6k   1/1     Running             0          140m
[root@k8s-master01 ~]# kubectl get po
NAME                     READY   STATUS    RESTARTS   AGE
nginx-68db656dd8-df8xn   1/1     Running   0          109s
nginx-68db656dd8-fdw4k   1/1     Running   0          104s

### --- 查看最终的配置参数是否符合更改后的参数配置
~~~     查看结果是否符合更改后的参数

[root@k8s-master01 ~]# kubectl get deploy nginx -oyaml
    spec:
      containers:
      - image: nginx:1.15.3
        imagePullPolicy: IfNotPresent
        name: nginx
        resources:
          limits:
            cpu: 200m
            memory: 128Mi
          requests:
            cpu: 10m

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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