9.Pod控制器概念和基本操作2

利用一个简单的例子来启动一个deployment的Pod控制器

[root@master song]# cat deploy.yml

apiVersion: apps/v1

kind: Deployment

metadata:

  name: myapp-deploy

  namespace: default

spec:

  replicas:

  selector:

    matchLabels:

      app: myapp

      release: canary

  template:

    metadata:

      labels:

        app: myapp

        release: canary

    spec:

      containers:

      - name: myapp

        image: ikubernetes/myapp:v1

Pod.yml

启动控制器

kubectl create --save-config  -f deploy.yml

[root@master song]# !

kubectl get pod -l app=myapp

NAME                            READY   STATUS    RESTARTS   AGE

myapp-deploy-7769f49474-lq7dw   /     Running             14m

myapp-deploy-7769f49474-v4nj4   /     Running             14m

查看deployment和rs之间的命名关系

[root@master song]# kubectl get deployments.

NAME           READY   UP-TO-DATE   AVAILABLE   AGE

myapp-deploy   /                            15m

nginx-test     /                            6d21h

tomcat-test    /                            6d18h

[root@master song]# kubectl get rs

NAME                      DESIRED   CURRENT   READY   AGE

myapp-deploy-7769f49474                            15m           rs控制器的名字为deployment的名称+随机串

nginx-test-8bbbdc7d5                               6d21h

nginx-test-8f5f46d94                               6d20h

tomcat-test-76789745c5                             6d18h

编辑配置文件将 replicas改为3

使用 kubectl get pods -l app=myapp -w

^C[root@master ~]# kubectl get pods -l app=myapp -w

NAME                            READY   STATUS    RESTARTS   AGE

myapp-deploy-84d9546645-l6gvz   /     Running             6m3s

myapp-deploy-84d9546645-lmn8n   /     Running             6m3s

pod-demo                        /     Running             2d3h

myapp-deploy-84d9546645-tjhtr   /   Pending        0s

myapp-deploy-84d9546645-tjhtr   /   Pending        0s

myapp-deploy-84d9546645-tjhtr   /   ContainerCreating        0s

myapp-deploy-84d9546645-tjhtr   /   Running        2s

在将配置文件中副本数一值改为5，进行版本升级操作

是控制器配置生效的集中操作 apply直接更改配置文件 edit 编辑动态配置 path 命令行动态的以json形式进行资源更改

kubectl patch deployments myapp-deploy -p '{"spec":{"strategy":{"rollingUpdate":{"maxSurge":1,"maxUnavailable":0}}}}' 字母不能错，错了不提示

查看最新描述中有关rollingUpdate 的部分操作

Selector:               app=myapp,release=canary

Replicas:                desired |  updated |  total |  available |  unavailable

StrategyType:           RollingUpdate

MinReadySeconds:

RollingUpdateStrategy:   max unavailable,  max surge

进行版本更新，并在途中执行pause命令来进行服务暂停

[root@master song]# kubectl set image deployment myapp-deploy myapp=ikubernetes/myapp:v2 && kubectl rollout pause deployment myapp-deploy

deployment.extensions/myapp-deploy image updated

deployment.extensions/myapp-deploy paused

查看状态

[root@master ~]# kubectl get pods -l app=myapp -w

NAME                            READY   STATUS    RESTARTS   AGE

myapp-deploy-7769f49474-8zxl2   /     Running             13m

myapp-deploy-7769f49474-jsj6l   /     Running             20m

myapp-deploy-7769f49474-nkr5g   /     Running             13m

myapp-deploy-7769f49474-vc6dg   /     Running             20m

myapp-deploy-7769f49474-wg2cx   /     Running             20m

pod-demo                        /     Running             2d4h

myapp-deploy-84d9546645-v55vd   /   Pending        0s

myapp-deploy-84d9546645-v55vd   /   Pending        0s

myapp-deploy-84d9546645-v55vd   /   ContainerCreating        0s

myapp-deploy-84d9546645-v55vd   /   Running        1s

describe 来查看资源状态，5个副本中多出来一个就是我们的新启动的这个

Selector:               app=myapp,release=canary

Replicas:                desired |  updated |  total |  available |  unavailable

StrategyType:           RollingUpdate

MinReadySeconds:

RollingUpdateStrategy:   max unavailable,  max surge

Pod Template:

Daemonset 控制器

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9.Pod控制器概念和基本操作2

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