Kubernetes容器集群kubectl管理工具命令(八)

创建一个应用

[root@master ~]# kubectl run nginx --replicas=3 --labels="app=nginx-example" --image=nginx:1.10 --port=80

replicas：副本数为3个，默认1个
labels :标识识别属性，
image:默认从hub上下载

查看应用

[root@master ~]# kubectl get all NAME READY STATUS RESTARTS AGE pod/nginx-f95d765f9-bxgv9 0/1 ContainerCreating 0 2m pod/nginx-f95d765f9-pdq4x 0/1 ContainerCreating 0 2m pod/nginx-f95d765f9-znxw2 0/1 ContainerCreating 0 2m NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/kubernetes ClusterIP 10.10.10.1 <none> 443/TCP 21h NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE deployment.extensions/nginx 3 3 3 0 2m NAME DESIRED CURRENT READY AGE replicaset.extensions/nginx-f95d765f9 3 3 0 2m NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE deployment.apps/nginx 3 3 3 0 2m NAME DESIRED CURRENT READY AGE replicaset.apps/nginx-f95d765f9 3 3 0 2m 正在创建中

查看pod详细信息

[root@master ~]# kubectl describe pod/nginx-f95d765f9-bxgv9

查看pod标签

[root@master ~]# kubectl get pods --show-labels
NAME                    READY     STATUS    RESTARTS   AGE       LABELS
nginx-f95d765f9-bxgv9   1/1       Running   0          9m        app=nginx-example,pod-template-hash=951832195
nginx-f95d765f9-pdq4x   1/1       Running   0          9m        app=nginx-example,pod-template-hash=951832195
nginx-f95d765f9-znxw2   1/1       Running   0          9m        app=nginx-example,pod-template-hash=951832195

查看Pod分配到哪个节点

[root@master ~]# kubectl get pods -o wide
NAME                       READY     STATUS    RESTARTS   AGE       IP            NODE
busybox-5d4f595646-tqfp2   1/1       Running   2          2m        172.17.45.4   192.168.1.102
nginx-f95d765f9-bxgv9      1/1       Running   0          14m       172.17.47.2   192.168.1.103
nginx-f95d765f9-pdq4x      1/1       Running   0          14m       172.17.45.2   192.168.1.102
nginx-f95d765f9-znxw2      1/1       Running   0          14m       172.17.47.3   192.168.1.103

[root@master ~]# kubectl get deploy -o wide
NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE       CONTAINERS   IMAGES       SELECTOR
busybox   1         1         1            0           3m        busybox      busybox      run=busybox
nginx     3         3         3            3           15m       nginx        nginx:1.10   app=nginx-example

[root@master ~]# kubectl get deploy
NAME      DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
busybox   1         1         1            1           5m
nginx     3         3         3            3           17m

发布应用

发布：

[root@master ~]# kubectl get deploy
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
busybox 1 1 1 1 5m
nginx 3 3 3 3 17m

[root@master ~]# kubectl expose deployment nginx --port=88 --type=NodePort --target-port=80 --name=nginx-service

通过svc查看发布的应用

[root@master ~]# kubectl get svc
NAME            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)        AGE
kubernetes      ClusterIP   10.10.10.1   <none>        443/TCP        23h
nginx-service   NodePort    10.10.10.9   <none>        88:36046/TCP   1m

故障排查

// 查看Events事件
kubectl describe pod名称  

// 通过deploy查看事件
kubectl describe deploy/nginx 

//查看发布具体信息
kubectl describe svc name名称

//查看日志
kubectl logs  pod名称

//进入容器排查
kubectl exec -it pod名称 bash

更新镜像升级

//把当前nginx:1.10版本更新至1.11
[root@master ~]# kubectl set image deployments/nginx nginx=nginx:1.11

or

kubectl edit deploy/nginx  编辑里面的镜像版本号保存退出

查看发布状态

// 布署资源的状态
kubectl rollout status deploy/nginx

// 发布的历史版本
kubectl rollout history deploy/nginx

回滚

//回退到上一个退版
kubectl rollout undo deploy/nginx   默认回滚到上一个版本

//查看状态
kubectl  rollout status deploy/nginx

//回到指定版本
kubectl rollout undo deploy/nginx --to-revision=4

pod副本扩容

// 把当前的pod扩容到5个
kubectl scale deploy/nginx --replicas=5

缩减也是上述命令

删除

// 删除pod
kubectl delete deployment.extensions/nginx

//删除service
kubectl delete service/nginx-service

//查看
 kubectl get all
kubectl get deploy