Kubernetes滚动更新(无中断平滑发布)

作者: root007 分类: kubernetes 发布时间: 2019-03-05 10:41

Kubernetes支持名为Rolling Update的功能,允许您不间断地,
接近几乎无缝地平滑升级部署应用程序 ,即在不停止对外服务的前提下完成应用的更新。

什么是滚动更新?

为了应用升级部署时候k8s不停服达到用户无感知,Kubernetes支持称为滚动更新的功能。此功能允许您按顺序更新pod,一次更新一个(按照配置比例),而不是一次停止/更新整个pod。使发布版本更新和回滚而不会中断服务

kubectl rolling-update仅在使用Replication Controllers 部署应用程序时才使用该命令。最新版本的Kubernetes 建议使用Deployment部署应用程序。 

滚动更新

创建deployment部署nginx:v1

[root@k8s-master ~]# cat deployment.yaml 
apiVersion: apps/v1 
kind: Deployment
metadata:
  name: nginx-dm
  labels:
    app: nginx-dm
spec:
  replicas: 3
  minReadySeconds: 10
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app: nginx-dm
  template:
    metadata:
      labels:
        app: nginx-dm
    spec:
      containers:
      - name: nginx-dm
        image: registry.cn-hangzhou.aliyuncs.com/k8simages_wt/nginx:v1
        imagePullPolicy: Always
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-dm-service
spec:
  ports:
    - name: http
      port: 80
      targetPort: 80
  selector:
    app: nginx-dm
  type: NodePort
kubectl  apply -f deployment.yaml
[root@k8s-master ~]# kubectl  get pod -l app=nginx-dm
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-7597c9f695-b8qvt   2/2     Running   0          19s
nginx-deployment-7597c9f695-l4x6g   2/2     Running   0          19s
nginx-deployment-7597c9f695-nr724   2/2     Running   0          19s
主要部分
 replicas: 3
  minReadySeconds: 10
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
spec.replicas

表示Pod的副本数量。我已经设置了初始配置来复制三个Pod以进行滚动更新测试

spec.minReadySeconds

这是从pod变为Ready阶段到变为Available阶段的时间。滚动升级时10s后认为该pod就绪可用,建议设置适当的时间minReadySeconds以考虑pod容器初始化的时间

spec.strategy

为RollingUpdate进行详细设置 定义升级的策略

 spec.strategy.type

可以是”Recreate”或者是 “RollingUpdate”。”RollingUpdate”是默认值。Recreate时,在创建出新的Pod之前会先杀掉所有已存在的Pod。
RollingUpdate时,Deployment使用rolling update 的方式更新Pod 。你可以指定maxUnavailable 和maxSurge 来控制 rolling update 进程。

spec.strategy.rollingUpdate

如果在spec.strategy.type中设置“RollingUpdate”,请对RollingUpdate进行详细设置。

spec.strategy.rollingUpdate.maxSurge

滚动更新期间可以创建的pod的最大数量超过指定数量的pod。1表示当一个新的pod被创建才会删除一个pod,以此类推。可以是具体的整数,也可以是百分百 默认值为25%

更新过程中,最多有一个 Pod 不可用。在rollgin更新期间无法使用的最大pod数。该值可以设置为具有大于0的整数的pod的绝对数量,并且百分比表示也是可能的,例如“25%”。
maxUnavailable中的百分比计算向下舍入,默认值为25%。
maxSurge和maxUnavailable值不能同时为零。

滚动更新和验证

在使用Deployment进行应用程序部署的情况下,kubectl set image命令用于更新镜像版本。

滚动更新进度监控查看

kubectl get pod -w

^C[root@k8s-master ~]# kubectl get pod -w | grep nginx
nginx-deployment-7597c9f695-b8qvt 2/2 Running 0 11h
nginx-deployment-7597c9f695-l4x6g 2/2 Running 0 11h
nginx-deployment-7597c9f695-nr724 2/2 Running 0 11h

通过kubectl set image 命令更新nginx:v2版本

[root@k8s-master ~]# kubectl set image deployment/nginx-deployment nginx-dm=registry.cn-hangzhou.aliyuncs.com/k8simages_wt/nginx:v2
deployment.extensions/nginx-deployment image updated

查看滚动更新

^C[root@k8s-master ~]# kubectl  get pod -w | grep nginx
nginx-deployment-7597c9f695-b8qvt   2/2     Running   0          11h
nginx-deployment-7597c9f695-l4x6g   2/2     Running   0          11h
nginx-deployment-7597c9f695-nr724   2/2     Running   0          11h


nginx-deployment-5f948bdcb8-2s28z   0/2   Pending   0     0s
nginx-deployment-5f948bdcb8-2s28z   0/2   Pending   0     0s
nginx-deployment-5f948bdcb8-2s28z   0/2   Init:0/1   0     0s
nginx-deployment-5f948bdcb8-2s28z   0/2   PodInitializing   0     1s
nginx-deployment-5f948bdcb8-2s28z   2/2   Running   0     3s
nginx-deployment-7597c9f695-l4x6g   2/2   Terminating   0     11h
nginx-deployment-5f948bdcb8-ljdqz   0/2   Pending   0     0s
nginx-deployment-5f948bdcb8-ljdqz   0/2   Pending   0     0s
nginx-deployment-5f948bdcb8-ljdqz   0/2   Init:0/1   0     1s
nginx-deployment-7597c9f695-l4x6g   0/2   Terminating   0     11h
nginx-deployment-7597c9f695-l4x6g   0/2   Terminating   0     11h
nginx-deployment-5f948bdcb8-ljdqz   0/2   PodInitializing   0     8s
nginx-deployment-5f948bdcb8-ljdqz   2/2   Running   0     10s
nginx-deployment-7597c9f695-l4x6g   0/2   Terminating   0     11h
nginx-deployment-7597c9f695-l4x6g   0/2   Terminating   0     11h
nginx-deployment-7597c9f695-b8qvt   2/2   Terminating   0     11h
nginx-deployment-5f948bdcb8-ksk8w   0/2   Pending   0     0s
nginx-deployment-5f948bdcb8-ksk8w   0/2   Pending   0     0s
nginx-deployment-5f948bdcb8-ksk8w   0/2   Init:0/1   0     0s
nginx-deployment-7597c9f695-b8qvt   0/2   Terminating   0     11h
nginx-deployment-7597c9f695-b8qvt   0/2   Terminating   0     11h
nginx-deployment-7597c9f695-b8qvt   0/2   Terminating   0     11h
nginx-deployment-5f948bdcb8-ksk8w   0/2   PodInitializing   0     2s
nginx-deployment-5f948bdcb8-ksk8w   2/2   Running   0     4s

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