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