Docker Kubernetes 容器更新与回滚

Docker Kubernetes 容器更新与回滚

环境：

• 系统：Centos 7.4 x64
• Docker版本：18.09.0
• Kubernetes版本：v1.8
• 管理节点：192.168.1.79
• 工作节点：192.168.1.78
• 工作节点：192.168.1.77

创建环境：

• 1、Deployment名称：nginx-deployment
• 2、pods副本数为：3 
• 3、image镜像：nginx1.9

---

更新升级

方案一：管理节点：滚动升级镜像。

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

kubectl set image 资源类型/资源名称 容器名称=镜像版本

命令注解

方案二：管理节点：修改原yaml配置文件重新加载完成滚动升级

kubectl apply -f nginx-deployment.yaml

管理节点：查看升级情况

命令：kubectl describe deployment nginx-deployment
 
# 镜像已更新
    Image:        nginx:1.11
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
# 扩容版本
  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
# 缩容版本
  Normal  ScalingReplicaSet  34s   deployment-controller  Scaled down replica set nginx-deployment-845cfc7fb9 to 2
# 扩容版本
  Normal  ScalingReplicaSet  34s   deployment-controller  Scaled up replica set nginx-deployment-7ff5df4cfb to 2
# 缩容版本
  Normal  ScalingReplicaSet  18s   deployment-controller  Scaled down replica set nginx-deployment-845cfc7fb9 to 1
# 扩容版本
  Normal  ScalingReplicaSet  18s   deployment-controller  Scaled up replica set nginx-deployment-7ff5df4cfb to 3
# 缩容版本
  Normal  ScalingReplicaSet  15s   deployment-controller  Scaled down replica set nginx-deployment-845cfc7fb9 to 0

查看deployment镜像升级描述信息

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

实时观察发布状态：

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

查看deployment历史修订版本

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

查看指定历史修订版本

---

版本回滚

管理节点：回滚到上一个版本

kubectl rollout undo deployment nginx-deployment

kubectl rollout undo 资源类型 资源名称

命令注解

管理节点：指定版本回滚

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

kubectl rollout undo 资源类型 资源名称 --to-revision=版本号
 
注：kubectl rollout history 资源类型 资源名称 查看的版本号。

命令注解

管理节点：查看回滚情况

命令：kubectl rollout history deployment/nginx-deployment
 
deployments "nginx-deployment"
REVISION  CHANGE-CAUSE
1         <none>
2         <none>
4         <none>
5         <none>
注：将还原版本覆盖，并生成新的版本号。

查看deployment历史修订版本