在kubernetes运行一个容器案例

1. 检查kubernetes 组件是否正常运行。

[root@c720120 ~]# kubectl get cs
NAME                 STATUS    MESSAGE              ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-0               Healthy   {"health": "true"}  
etcd-1               Healthy   {"health": "true"}  
etcd-2               Healthy   {"health": "true"} 

2. 检查kubernetes master状态

[root@c720120 ~]# kubectl cluster-info
Kubernetes master is running at https://192.168.20.134:6443
Heapster is running at https://192.168.20.134:6443/api/v1/namespaces/kube-system/services/heapster/proxy
KubeDNS is running at https://192.168.20.134:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
monitoring-grafana is running at https://192.168.20.134:6443/api/v1/namespaces/kube-system/services/monitoring-grafana/proxy
monitoring-influxdb is running at https://192.168.20.134:6443/api/v1/namespaces/kube-system/services/monitoring-influxdb/proxy

To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

3. 检查所有节点是否准备好。

[root@c720120 ~]# kubectl get nodes
NAME               STATUS     ROLES     AGE       VERSION
c720120.xiodi.cn   Ready      master    23d       v1.10.3
c720121.xiodi.cn   Ready      master    23d       v1.10.3
c720128.xiodi.cn   Ready      <none>    23d       v1.10.3
c720129.xiodi.cn   Ready      <none>    23d       v1.10.3

4. 运行一个nginx的容器案例

[root@c720120 ~]# kubectl run my-first-nginx --image=nginx --replicas=2 --port=80
deployment.apps "my-first-nginx" created

5. 查看所有的pods.

[root@c720120 ~]# kubectl get pods
NAME                                READY     STATUS    RESTARTS   AGE
alpine-interactive-669f6844-dxns9   1/1       Running   3          21d
flask-7bdd449f7f-kj2z9              1/1       Running   1          2d
my-first-nginx-6c9fb6f56b-f8kxd     1/1       Running   0          52s
my-first-nginx-6c9fb6f56b-k5vdz     1/1       Running   0          52s
nginx                               1/1       Running   2          22d

6. 查看所有的deployment

[root@c720120 ~]# kubectl get deployment
NAME                 DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
alpine-interactive   1         1         1            1           21d
flask                1         1         1            1           21d
my-first-nginx       2         2         2            2           3m

7. 映射端口到外部，让用户能够访问该服务

[root@c720120 ~]# kubectl expose deployment my-first-nginx --port=80 --type=LoadBalancer
service "my-first-nginx" exposed

8. 查看发布的服务

[root@c720120 ~]# kubectl get services
NAME             TYPE           CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
kubernetes       ClusterIP      10.96.0.1     <none>        443/TCP        23d
my-first-nginx   LoadBalancer   10.97.75.31   <pending>     80:31158/TCP   3m

9. 停止应用

[root@c720120 ~]# kubectl delete deployment my-first-nginx
deployment.extensions "my-first-nginx" deleted
[root@c720120 ~]# kubectl delete service my-first-nginx
service "my-first-nginx" deleted

10. 可以查看创建的服务详细信息

[root@c720120 ~]# kubectl describe service my-first-nginx
Name:                     my-first-nginx
Namespace:                default
Labels:                   run=my-first-nginx
Annotations:              <none>
Selector:                 run=my-first-nginx
Type:                     LoadBalancer
IP:                       10.111.128.100
Port:                     <unset>  80/TCP
TargetPort:               80/TCP
NodePort:                 <unset>  30066/TCP
Endpoints:                10.244.3.20:80,10.244.4.8:80
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

11. 用浏览器进行校验下服务