kubectl命令范例

1、查看集群状态

[root@clientvm ~]# kubectl cluster-info
Kubernetes master is running at https://192.168.133.129:6443
KubeDNS is running at https://192.168.133.129:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.

2、查看集群版本

[root@clientvm ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.4", GitCommit:"d360454c9bcd1634cf4cc52d1867af5491dc9c5f", GitTreeState:"clean", BuildDate:"2020-11-11T13:17:17Z", GoVersion:"go1.15.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.0", GitCommit:"e19964183377d0ec2052d1f1fa930c4d7575bd50", GitTreeState:"clean", BuildDate:"2020-08-26T14:23:04Z", GoVersion:"go1.15", Compiler:"gc", Platform:"linux/amd64"}

3、查看集群API信息

[root@clientvm ~]# kubectl api-versions
[root@clientvm ~]# kubectl api-resources

4、查看节点状态

[root@clientvm ~]# kubectl get node
NAME                  STATUS   ROLES    AGE     VERSION
master.example.com    Ready    master   9m18s   v1.19.4
worker1.example.com   Ready    <none>   4m9s    v1.19.4
worker2.example.com   Ready    <none>   3m51s   v1.19.4

5、查看节点扩展信息

[root@clientvm ~]# kubectl get node -o wide
NAME                  STATUS   ROLES    AGE     VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE                KERNEL-VERSION               CONTAINER-RUNTIME
master.example.com    Ready    master   10m     v1.19.4   192.168.241.129   <none>        CentOS Linux 7 (Core)   3.10.0-1160.6.1.el7.x86_64   docker://19.3.11
worker1.example.com   Ready    <none>   5m10s   v1.19.4   192.168.241.130   <none>        CentOS Linux 7 (Core)   3.10.0-1160.6.1.el7.x86_64   docker://19.3.11
worker2.example.com   Ready    <none>   4m52s   v1.19.4   192.168.241.131   <none>        CentOS Linux 7 (Core)   3.10.0-1160.6.1.el7.x86_64   docker://19.3.11

6、查看节点详细描述

[root@clientvm ~]# kubectl describe nodes master.example.com

7、将资源信息以yaml格式输出

[root@clientvm ~]# kubectl get nodes master.example.com -o yaml

8、将资源信息以json格式输出

[root@clientvm ~]# kubectl get nodes master.example.com -o json

9、explain命令

[root@clientvm ~]# kubectl explain namespace
KIND:     Namespace
VERSION:  v1
......