k8s安装nginx

# 1.部署 Nginx pod

[root@master ~]# cat nginx-deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80
        resources:
          requests:
            cpu: 1
            memory: 500Mi
          limits:
            cpu: 2
            memory: 1024Mi

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查看deployment

[root@master ~]# vim nginx-deployment.yaml 
[root@master ~]# kubectl apply -f nginx-deployment.yaml
deployment.apps/nginx-deployment created
[root@master ~]# kubectl get deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   3/3     3            3           20s

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[root@master ~]# kubectl get pods
NAME                                READY   STATUS              RESTARTS   AGE
nginx-deployment-5d59d67564-6k5t5   0/1     ContainerCreating   0          5s
nginx-deployment-5d59d67564-b65tc   0/1     ContainerCreating   0          5s
nginx-deployment-5d59d67564-hxqhd   1/1     Running             0          5s
[root@master ~]# kubectl get pods
NAME                                READY   STATUS              RESTARTS   AGE
nginx-deployment-5d59d67564-6k5t5   0/1     ContainerCreating   0          24s
nginx-deployment-5d59d67564-b65tc   1/1     Running             0          24s
nginx-deployment-5d59d67564-hxqhd   1/1     Running             0          24s
[root@master ~]# kubectl get pods
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-5d59d67564-6k5t5   1/1     Running   0          25s
nginx-deployment-5d59d67564-b65tc   1/1     Running   0          25s
nginx-deployment-5d59d67564-hxqhd   1/1     Running   0          25s

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# 2.创建 service, 并让外部访问

[root@master ~]# cat nginx-service.yaml 
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
  labels:
    app: nginx
spec:
  ports:
  - port: 88
    targetPort: 80
    nodePort: 80
  selector:
    app: nginx
  type: NodePort

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[root@master ~]# vim nginx-service.yaml
[root@master ~]# kubectl create -f nginx-service.yaml
service/nginx-service created
[root@master ~]# kubectl get svc
NAME            TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)     AGE
kubernetes      ClusterIP   10.96.0.1       <none>        443/TCP     5d8h
nginx-service   NodePort    10.111.182.42   <none>        88:80/TCP   8s

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在浏览器中访问访问地址格式为 MasterIP:NodePort, NodePort 为kubectl get service/nginx-servic 后 88:80/TCP中 80这个端口；本次为http://任意节点ip:80/

# 3.敲重点:验证k8s强大的自愈能力

删除一个pod

[root@master ~]# kubectl get pods 
NAME                             READY   STATUS    RESTARTS   AGE
nginx-57787bbfc6-7fwkx   1/1     Running   0          6m32s
nginx-57787bbfc6-j4p5c   1/1     Running   0          6m32s
nginx-57787bbfc6-z79kb   1/1     Running   0          6m32s
[root@master ~]# kubectl delete pods nginx-57787bbfc6-7fwkx  
pod "nginx-57787bbfc6-7fwkx" deleted

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自动补上一个pod

[root@master ~]# 
[root@master ~]# kubectl get pods 
NAME                             READY   STATUS    RESTARTS   AGE
nginx-57787bbfc6-4jxtw   1/1     Running   0          10s
nginx-57787bbfc6-j4p5c   1/1     Running   0          7m12s
nginx-57787bbfc6-z79kb   1/1     Running   0          7m12s
[root@master ~]#

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