使用kubens管理命名空间namespace

使用kubens管理命名空间namespace
默认的切换命名空间的命令不好用，可以使用第三方的命名空间切换工具：kubens，kubens命令所在的网站为：https://github.com/ahmetb/kubectx/releases/
下载kubens，并授予可执行权限

[root@k8scloude1 ~]# wget https://github.com/ahmetb/kubectx/releases/download/v0.9.4/kubens
[root@k8scloude1 ~]# ll -h kubens 
-rw-r--r-- 1 root root 5.5K 12月  8 15:46 kubens
[root@k8scloude1 ~]# chmod +x kubens 
[root@k8scloude1 ~]# mv kubens /bin/
[root@k8scloude1 ~]# ls /bin/kubens 
/bin/kubens

查看所有的命名空间

[root@k8scloude1 ~]# kubens 
default
kube-node-lease
kube-public
kube-system
ns1
ns2

切换namespace到kube-system

[root@k8scloude1 ~]# kubens kube-system
Context "kubernetes-admin@kubernetes" modified.
Active namespace is "kube-system".

此时，默认查询的就是kube-system命名空间下的pod

[root@k8scloude1 ~]# kubectl get pods -o wide
NAME                                       READY   STATUS    RESTARTS   AGE   IP                NODE         NOMINATED NODE   READINESS GATES
calico-kube-controllers-6b9fbfff44-4jzkj   1/1     Running   2          20h   10.244.251.194    k8scloude3   <none>           <none>
calico-node-bdlgm                          1/1     Running   1          20h   192.168.110.130   k8scloude1   <none>           <none>
calico-node-hx8bk                          1/1     Running   1          20h   192.168.110.128   k8scloude3   <none>           <none>
calico-node-nsbfs                          1/1     Running   1          20h   192.168.110.129   k8scloude2   <none>           <none>
coredns-545d6fc579-7wm95                   1/1     Running   1          20h   10.244.158.68     k8scloude1   <none>           <none>
coredns-545d6fc579-87q8j                   1/1     Running   1          20h   10.244.158.67     k8scloude1   <none>           <none>
etcd-k8scloude1                            1/1     Running   1          20h   192.168.110.130   k8scloude1   <none>           <none>
kube-apiserver-k8scloude1                  1/1     Running   1          20h   192.168.110.130   k8scloude1   <none>           <none>
kube-controller-manager-k8scloude1         1/1     Running   1          20h   192.168.110.130   k8scloude1   <none>           <none>
kube-proxy-599xh                           1/1     Running   1          20h   192.168.110.128   k8scloude3   <none>           <none>
kube-proxy-lpj8z                           1/1     Running   1          20h   192.168.110.129   k8scloude2   <none>           <none>
kube-proxy-zxlk9                           1/1     Running   1          20h   192.168.110.130   k8scloude1   <none>           <none>
kube-scheduler-k8scloude1                  1/1     Running   1          20h   192.168.110.130   k8scloude1   <none>           <none>
metrics-server-bcfb98c76-k5dmj             1/1     Running   0          56m   10.244.112.131    k8scloude2   <none>           <none>

切换namespace到default

[root@k8scloude1 ~]# kubens default
Context "kubernetes-admin@kubernetes" modified.
Active namespace is "default".

此时，默认查询的就是default命名空间下的pod

[root@k8scloude1 ~]# kubectl get pods -o wide
No resources found in default namespace.