kubernetes（八）二进制安装-集群简单验证

验证集群功能(在master节点上执行）

以一个nginx的service和deployment来验证集群功能

1. 创建启动文件

   mkdir /opt/k8s/yml
   
   cd /opt/k8s/yml
   
   cat > nginx.yml << EOF
   apiVersion: v1
   kind: Service
   metadata:
     name: nginx
     labels:
       app: nginx
   spec:
     type: NodePort
     selector:
       app: nginx
     ports:
     - name: http
       port: 80
       targetPort: 80
       nodePort: 8080
   ---
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: nginx-deployment
   spec:
     selector:
       matchLabels:
         app: nginx
     replicas: 1
     template:
       metadata:
         labels:
           app: nginx
       spec:
         containers:
         - name: nginx
           image: nginx:1.9.1
           ports:
           - containerPort: 80
   EOF
    
   

2. 启动服务

   kubectl create -f nginx.yml
   
   

   • 第一次启动时需要下载k8s.gcr.io/pause:3.1镜像，国内无法直接下载，造成服务无法启动，通过下面操作来解决

     docker pull kubeimage/pause:3.1
     docker tag kubeimage/pause:3.1 k8s.gcr.io/pause:3.1 
     
     

3. 观察服务启动情况

   
   root@master:/opt/k8s/yml# kubectl get service -o wide
   NAME         TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)       AGE   SELECTOR
   kubernetes   ClusterIP   10.254.0.1            443/TCP       41h   
   nginx        NodePort    10.254.8.25           80:8080/TCP   30m   app=nginx
   root@master:/opt/k8s/yml# kubectl get pod -o wide
   NAME                                READY   STATUS    RESTARTS   AGE   IP            NODE    NOMINATED NODE   READINESS GATES
   nginx-deployment-56f8998dbc-955gf   1/1     Running   0          30m   172.30.78.2   slave              
   root@master:/opt/k8s/yml# curl http://192.168.0.114:8080
   
   
   
   
   
   
   
   Welcome to nginx!
   If you see this page, the nginx web server is successfully installed and
   working. Further configuration is required.
   
   For online documentation and support please refer to
   nginx.org.
   
   Commercial support is available at
   nginx.com.
   
   Thank you for using nginx.
   
   
   
   

遇到问题

1. k8s组件 kube-scheduler服务停掉，造成所有的pod都处于pending状态，没有任何events信息
2. k8s组件kube-controller-manager服务停掉，造成所有的rs、rc都不创建，对应的deployment中没有任何events信息，NewReplicats