---

[CloudNative：KuberNetes&資源排程.V13]                                                               [Applications.KuberNetes] [StatefulSet應用|容器中匯出映象匯入映象StatefulSet擴容縮容StatefulSet建立pod縮減pod的流程|] [StatefulSet更新策略|StatefulSet灰度釋出|StatefulSet級聯刪除和非級聯刪除|]

---

---

三、StatefulSet更新策略二：OnDelete

### --- 新增配置引數，觸發更新
~~~     # 更改StatefulSet配置引數映象版本更改為1.15.3
~~~     使用 OnDelete去更新；它是不會觸發更新的，只有把這個Pod刪除之後才會觸發更新映象

[root@k8s-master01 ~]# kubectl edit sts web
    spec:
      containers:
      - image: nginx:1.15.3 
   updateStrategy:
    type: OnDelete
 

~~~     # 檢視pod的狀態

[root@k8s-master01 ~]# kubectl get po
NAME    READY   STATUS    RESTARTS   AGE
web-0   1/1     Running   0          7m21s
web-1   1/1     Running   0          7m18s
web-2   1/1     Running   0          8m1s

### --- 刪除web-2觸發更新
~~~     # 刪除web-2；觸發更新

[root@k8s-master01 ~]# kubectl delete po web-2
pod "web-2" deleted
 

~~~     # 檢視已更新web-2.pod的映象版本

[root@k8s-master01 ~]# kubectl get po web-2 -oyaml |grep image
            f:image: {}
            f:imagePullPolicy: {}
  - image: nginx:1.15.3                         // 可以檢視到它的映象版本是1.15.3
    imagePullPolicy: IfNotPresent
    image: nginx:1.15.3 
    imageID: docker-pullable://nginx@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
 

~~~     # 檢視未更新web-1.pod的映象版本

[root@k8s-master01 ~]# kubectl get po web-1 -oyaml |grep image
            f:image: {}
            f:imagePullPolicy: {}
  - image: nginx:1.15.2                         // 而是web-1的映象是1.15.2，沒有更新
    imagePullPolicy: IfNotPresent
    image: nginx:1.15.2
    imageID: docker-pullable://nginx@sha256:d85914d547a6c92faa39ce7058bd7529baacab7e0cd4255442b04577c4d1f424

### --- 檢視statefuel.OnDelete更新流程 
~~~     # 檢視pod的更新流程   

[root@k8s-master01 ~]# kubectl get po -l app=nginx -w
web-2   1/1     Terminating         0          8m59s                                //刪除web-2之後觸發更新
web-2   0/1     Terminating         0          9m1s
web-2   0/1     Terminating         0          10m
web-2   0/1     Terminating         0          10m
web-2   0/1     Pending             0          0s
web-2   0/1     Pending             0          0s
web-2   0/1     ContainerCreating   0          1s
web-2   1/1     Running             0          3s   

~~~     # 那麼我們同時刪除web-0和web-1，讓他觸發更新

[root@k8s-master01 ~]# kubectl delete po web-0 web-1
pod "web-0" deleted
pod "web-1" deleted

~~~     # 檢視對應的映象版本

[root@k8s-master01 ~]# kubectl get po  -oyaml |grep image                           //可以看到所有的映象版本都更新為1.15.3
              f:image: {}
              f:imagePullPolicy: {}
    - image: nginx:1.15.3
      imagePullPolicy: IfNotPresent
      image: nginx:1.15.3
      imageID: docker-pullable://nginx@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
              f:image: {}
              f:imagePullPolicy: {}
    - image: nginx:1.15.3
      imagePullPolicy: IfNotPresent
      image: nginx:1.15.3
      imageID: docker-pullable://nginx@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3
              f:image: {}
              f:imagePullPolicy: {}
    - image: nginx:1.15.3
      imagePullPolicy: IfNotPresent
      image: nginx:1.15.3
      imageID: docker-pullable://nginx@sha256:24a0c4b4a4c0eb97a1aabb8e29f18e917d05abfe1b7a7c07857230879ce7d3d3

### --- 檢視pod的更新流程

[root@k8s-master01 ~]# kubectl get po -l app=nginx -w
web-0   1/1     Terminating         0          12m
web-1   1/1     Terminating         0          12m
web-0   0/1     Terminating         0          12m
web-1   0/1     Terminating         0          12m
web-0   0/1     Terminating         0          13m
web-0   0/1     Pending             0          1s
web-0   0/1     ContainerCreating   0          1s
web-0   1/1     Running             0          3s
web-1   0/1     Pending             0          0s
web-1   0/1     ContainerCreating   0          0s
web-1   1/1     Running             0          2s

---

===============================END===============================

---

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

---

來自為知筆記(Wiz)