k8s deployment发布失败回滚

1. deployment发布失败回滚

• 查看历史发布版本

  kubectl rollout history deployment/web
  

• 回滚上一个版本

  kubectl rollout undo deployment/web
  

• 回滚历史指定版本

  kubectl rollout undo deployment/web --to-revision=2 
  

• 注：回滚是重新部署某一次部署时的状态，即当时版本所有配置

• 示例：yaml配置文件

  [root@k8s-master deployment]# cat web.yaml 
  apiVersion: apps/v1
  kind: Deployment
  metadata:
    name: web
    namespace: default
    annotations:       # 记录回滚参数
      kubernetes.io/change-cause: "web.v1-nginx-1.19"   #记录到revision中的内容，记录版本号
  spec:
    replicas: 9 # Pod副本预期数量
    revisionHistoryLimit: 10 # RS历史版本保存数量
    selector:
      matchLabels:
        app: web
    strategy:
      rollingUpdate:
        maxSurge: 25%             # 滚动更新过程最大pod副本数
        maxUnavailable: 25%       # 滚动更新过程中最大不可用pod副本数，
      type: RollingUpdate
    template:
      metadata:
        labels:
          app: web # Pod副本的标签
      spec:
        containers:
        - name: web
          image: nginx:1.19
          readinessProbe:          # 健康检查,如果失败，将杀死容器，来重启
            httpGet:
              port: 80
              path: /index.html
            initialDelaySeconds: 10 #启动容器后多少秒健康检查
            periodSeconds: 10 #以后间隔多少秒检查一次
  
          livenessProbe:   # 存活检查，失败就会剔除 service 
            httpGet:
              port: 80
              path: /index.html
  
  

• 查看history历史记录

  [root@k8s-master deployment]# kubectl rollout history deployment web
  deployment.apps/web 
  REVISION  CHANGE-CAUSE
  1         web.v1-nginx-1.16
  2         web.v1-nginx-1.18
  3         web.v1-nginx-1.19
  

2. 案例操作

• 查询发布历史版本

  [root@k8s-master deployment]# kubectl rollout history deployment web
  deployment.apps/web 
  REVISION  CHANGE-CAUSE
  1         web.v1-nginx-1.16
  2         web.v1-nginx-1.18
  3         web.v1-nginx-1.19
  
  
  

• 回滚到上一个版本

  [root@k8s-master deployment]# curl -I http://192.168.0.202:30082
  HTTP/1.1 200 OK
  Server: nginx/1.19.5
  Date: Tue, 01 Dec 2020 14:20:33 GMT
  Content-Type: text/html
  Content-Length: 612
  Last-Modified: Tue, 24 Nov 2020 13:02:03 GMT
  Connection: keep-alive
  ETag: "5fbd044b-264"
  Accept-Ranges: bytes
  
  # 回滚到上一个版本
  [root@k8s-master deployment]# kubectl rollout  undo deployment web
  deployment.apps/web rolled back
  
  
  [root@k8s-master deployment]# curl -I http://192.168.0.202:30082
  HTTP/1.1 200 OK
  Server: nginx/1.18.0
  Date: Tue, 01 Dec 2020 14:21:39 GMT
  Content-Type: text/html
  Content-Length: 612
  Last-Modified: Tue, 21 Apr 2020 14:09:01 GMT
  Connection: keep-alive
  ETag: "5e9efe7d-264"
  Accept-Ranges: bytes
  
  [root@k8s-master deployment]# kubectl rollout history deployment web
  deployment.apps/web 
  REVISION  CHANGE-CAUSE
  1         web.v1-nginx-1.16
  3         web.v1-nginx-1.19
  4         web.v1-nginx-1.18
  

  • 注释：
    1. 发现已经回滚到nginx版本1.18版本
    2. 我们发现2的版本号，被4的版本号替换，3的版本号是1.19.5的nginx版本

• 回滚到指定版本

  [root@k8s-master deployment]# kubectl rollout undo deployment web  --to-revision=3 
  deployment.apps/web rolled back
  
  [root@k8s-master deployment]# curl -I http://192.168.0.202:30082
  HTTP/1.1 200 OK
  Server: nginx/1.19.5
  Date: Tue, 01 Dec 2020 14:25:12 GMT
  Content-Type: text/html
  Content-Length: 612
  Last-Modified: Tue, 24 Nov 2020 13:02:03 GMT
  Connection: keep-alive
  ETag: "5fbd044b-264"
  Accept-Ranges: bytes
  
  [root@k8s-master deployment]# kubectl rollout history deployment web
  deployment.apps/web 
  REVISION  CHANGE-CAUSE
  1         web.v1-nginx-1.16
  4         web.v1-nginx-1.18
  5         web.v1-nginx-1.19
  

  • 注释：在这里，有没有发现，我们上面的实例代码里，进行配置后，版本号记录更改，都有记录