Docker Kubernetes 容器更新與回滾

環境：

• 系統：Centos 7.4 x64
• Docker版本：18.09.0
• Kubernetes版本：v1.8
• 管理節點：192.168.1.79
• 工作節點：192.168.1.78
• 工作節點：192.168.1.77

建立環境：

• 1、Deployment名稱：nginx-deployment
• 2、pods副本數為：3 
• 3、image映象：nginx1.9

更新升級

方案一：管理節點：滾動升級映象。

kubectl set image deployment nginx-deployment nginx=nginx:1.11

kubectl set image 資源型別/資源名稱 容器名稱=映象版本

方案二：管理節點：修改原yaml配置檔案重新載入完成滾動升級

kubectl apply -f nginx-deployment.yaml

管理節點：檢視升級情況

命令：kubectl describe deployment nginx-deployment

# 映象已更新
    Image:        nginx:1.11
  Type    Reason             Age   From                   Message
  
 
----    ------             ----  ----                   -------
# 擴容版本
  Normal  ScalingReplicaSet  24m   deployment-controller  Scaled up replica set nginx-deployment-845cfc7fb9 to 3
  Normal  ScalingReplicaSet  49s   deployment-controller  Scaled up replica set nginx-deployment-7ff5df4cfb to 1
# 縮容版本
 

  Normal  ScalingReplicaSet  34s   deployment-controller  Scaled down replica set nginx-deployment-845cfc7fb9 to 2
# 擴容版本
  Normal  ScalingReplicaSet  34s   deployment-controller  Scaled up replica set nginx-deployment-7ff5df4cfb to 2
# 縮容版本
  Normal  ScalingReplicaSet  18s   deployment-controller  Scaled down replica set nginx-deployment-845cfc7fb9 to 1
# 擴容版本
  Normal  ScalingReplicaSet  18s   deployment-controller  Scaled up replica set nginx-deployment-7ff5df4cfb to 3
# 縮容版本
  Normal  ScalingReplicaSet  15s   deployment-controller  Scaled down replica set nginx-deployment-845cfc7fb9 to 0

命令：kubectl rollout status deployment/nginx-deployment
Waiting for rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for rollout to finish: 1 out of 3 new replicas have been updated...
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 2 out of 3 new replicas have been updated...
Waiting for rollout to finish: 1 old replicas are pending termination...
Waiting for rollout to finish: 1 old replicas are pending termination...
deployment "nginx-deployment" successfully rolled out

命令：kubectl rollout history deployment/nginx-deployment
deployments "nginx-deployment"
REVISION  CHANGE-CAUSE
1         <none>
2         <none>

命令：kubectl rollout history deployment/nginx-deployment --revision=1

deployments "nginx-deployment" with revision #1
Pod Template:
  Labels:    app=nginx
    pod-template-hash=4017973965
  Containers:
   nginx:
    Image:    nginx:1.10
    Port:    80/TCP
    Environment:    <none>
    Mounts:    <none>
  Volumes:    <none>

版本回滾

管理節點：回滾到上一個版本

kubectl rollout undo deployment nginx-deployment

kubectl rollout undo 資源型別 資源名稱

管理節點：指定版本回滾

kubectl rollout undo deployment/nginx-deployment --to-revision=3

kubectl rollout undo 資源型別 資源名稱 --to-revision=版本號

注：kubectl rollout history 資源型別 資源名稱 檢視的版本號。

管理節點：查看回滾情況

命令：kubectl rollout history deployment/nginx-deployment

deployments "nginx-deployment"
REVISION  CHANGE-CAUSE
1         <none>
2         <none>
4         <none>
5         <none>
注：將還原版本覆蓋，並生成新的版本號。