伸缩应用

#首先查看最原始的副本数为1
[root@localhost 101]# kubectl get deploy

NAME                      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
app                       10        10        10           10          8d
filled-oyster-heapster    1         1         1            1           3d22h
httpd                     3         3         3            3           8d
nginx-app                 1         1         1            1           54m
nginx-deployment          2         2         2            2           10d
orderly-ostrich-mychart   1         1         1            1           6d23h
prometheus-operator       1         1         1            0           3d22h

#我扩展为50个
[root@localhost 101]# kubectl scale --replicas=50 deployment/nginx-app
deployment.extensions/nginx-app scaled
[root@localhost 101]# kubectl get deploy            
NAME                      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
app                       10        10        10           10          8d
filled-oyster-heapster    1         1         1            1           3d23h
httpd                     3         3         3            3           8d
nginx-app                 50        50        50           50          57m
nginx-deployment          2         2         2            2           10d
orderly-ostrich-mychart   1         1         1            1           6d23h
prometheus-operator       1         1         1            0           3d22h
#我收缩为30个
[root@localhost 101]# kubectl scale --replicas=30 deployment/nginx-app
deployment.extensions/nginx-app scaled
[root@localhost 101]# kubectl get deploy
NAME                      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
app                       10        10        10           10          8d
filled-oyster-heapster    1         1         1            1           3d23h
httpd                     3         3         3            3           8d
nginx-app                 30        30        30           30          58m
nginx-deployment          2         2         2            2           10d
orderly-ostrich-mychart   1         1         1            1           6d23h
prometheus-operator       1         1         1            0           3d22h

更新应用

#更新应用
[root@localhost 101]# kubectl set image deployment/nginx-app nginx-app=nginx:1.9.1
deployment.extensions/nginx-app image updated
#滚动升级的过程可以用 rollout 命令查看:
[root@localhost 101]# kubectl rollout status deployment/nginx-app
Waiting for deployment "nginx-app" rollout to finish: 2 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 2 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 2 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 3 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 3 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 3 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 4 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 4 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 5 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 5 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 5 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 5 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 6 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 6 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 6 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 6 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 6 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 7 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 7 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 7 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 8 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 8 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 8 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 9 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 9 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 9 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 9 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 9 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 10 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 10 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 10 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 10 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 10 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 11 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 11 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 11 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 12 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 12 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 13 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 13 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 13 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 13 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 14 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 14 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 14 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 15 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 15 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 15 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 16 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 16 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 16 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 17 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 17 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 17 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 17 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 18 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 18 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 18 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 18 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 18 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 19 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 19 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 21 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 21 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 21 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 22 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 22 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 22 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 22 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 23 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 23 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 29 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 29 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 29 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 29 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "nginx-app" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "nginx-app" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "nginx-app" rollout to finish: 29 of 30 updated replicas are available...
deployment "nginx-app" successfully rolled out
#验证pod是否改为1.9.1镜像了
[root@localhost 101]# kubectl describe pod nginx-app-6c5bf9d5bd-2t97x
Name:           nginx-app-6c5bf9d5bd-2t97x
Namespace:      default
Node:           10.0.60.51/10.0.60.51
Start Time:     Fri, 23 Nov 2018 16:11:27 +0800
Labels:         pod-template-hash=6c5bf9d5bd
                run=nginx-app
Annotations:    <none>
Status:         Running
IP:             172.20.0.162
Controlled By:  ReplicaSet/nginx-app-6c5bf9d5bd
Containers:
  nginx-app:
    Container ID:   docker://83f2ae7cd822ce67f75a77759e7275ae131e798ff5b9297cd916b2b5ffd8b542
    Image:          nginx:1.9.1
    Image ID:       docker-pullable://nginx@sha256:2f68b99bc0d6d25d0c56876b924ec20418544ff28e1fb89a4c27679a40da811b
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Fri, 23 Nov 2018 16:11:29 +0800
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-97cmq (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  default-token-97cmq:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-97cmq
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     <none>
Events:
  Type    Reason     Age    From                 Message
  ----    ------     ----   ----                 -------
  Normal  Scheduled  7m27s  default-scheduler    Successfully assigned default/nginx-app-6c5bf9d5bd-2t97x to 10.0.60.51
  Normal  Pulling    7m26s  kubelet, 10.0.60.51  pulling image "nginx:1.9.1"
  Normal  Pulled     7m25s  kubelet, 10.0.60.51  Successfully pulled image "nginx:1.9.1"
  Normal  Created    7m25s  kubelet, 10.0.60.51  Created container
  Normal  Started    7m25s  kubelet, 10.0.60.51  Started container

回滚

#查看版本历史
[root@localhost 101]# kubectl rollout history deployment/nginx-app
deployment.extensions/nginx-app 
REVISION  CHANGE-CAUSE
1         <none>
2         <none>
#回滚到上一次的版本
[root@localhost 101]# kubectl rollout undo deployment/nginx-app
deployment.extensions/nginx-app
#查看回滚状态
[root@localhost 101]# kubectl rollout status deployment/nginx-app
Waiting for deployment "nginx-app" rollout to finish: 11 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 11 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 12 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 12 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 12 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 13 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 13 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 13 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 14 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 14 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 15 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 15 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 15 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 15 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 16 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 16 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 16 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 16 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 17 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 17 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 17 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 18 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 18 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 19 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 19 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 19 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 19 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 20 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 21 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 21 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 22 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 22 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 22 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 23 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 23 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 23 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 23 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 24 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 25 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 26 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 27 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 28 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 29 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 29 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 29 out of 30 new replicas have been updated...
Waiting for deployment "nginx-app" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "nginx-app" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "nginx-app" rollout to finish: 1 old replicas are pending termination...
Waiting for deployment "nginx-app" rollout to finish: 29 of 30 updated replicas are available...
deployment "nginx-app" successfully rolled out
#验证是否已经回滚成功
[root@localhost 101]# kubectl describe pod nginx-app-58865955ff-z55vc 
Name:           nginx-app-58865955ff-z55vc
Namespace:      default
Node:           10.0.60.51/10.0.60.51
Start Time:     Fri, 23 Nov 2018 16:22:23 +0800
Labels:         pod-template-hash=58865955ff
                run=nginx-app
Annotations:    <none>
Status:         Running
IP:             172.20.0.187
Controlled By:  ReplicaSet/nginx-app-58865955ff
Containers:
  nginx-app:
    Container ID:   docker://a87b9f9feab73513d4a0b7c145c3580a4ee91566e16f0f1e008dc23fced82ad4
    Image:          nginx
    Image ID:       docker-pullable://nginx@sha256:d59a1aa7866258751a261bae525a1842c7ff0662d4f34a355d5f36826abc0341
    Port:           80/TCP
    Host Port:      0/TCP
    State:          Running
      Started:      Fri, 23 Nov 2018 16:22:26 +0800
    Ready:          True
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-97cmq (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  default-token-97cmq:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-97cmq
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     <none>
Events:
  Type    Reason     Age    From                 Message
  ----    ------     ----   ----                 -------
  Normal  Scheduled  2m46s  default-scheduler    Successfully assigned default/nginx-app-58865955ff-z55vc to 10.0.60.51
  Normal  Pulling    2m45s  kubelet, 10.0.60.51  pulling image "nginx"
  Normal  Pulled     2m44s  kubelet, 10.0.60.51  Successfully pulled image "nginx"
  Normal  Created    2m43s  kubelet, 10.0.60.51  Created container
  Normal  Started    2m43s  kubelet, 10.0.60.51  Started container