Kubernetes Certification Exam Self-Study Series | Managing Namespaces

Book source: "CKA/CKAD Test Guide: From Docker to Kubernetes Complete Raiders"

Organize the reading notes while studying, and share them with everyone. If the copyright is violated, it will be deleted. Thank you for your support!

Attach a summary post: Kubernetes certification exam self-study series | Summary_COCOgsta's Blog-CSDN Blog

---

Step 1: Check how many namespaces you currently have.

[root@vms10 ~]# kubectl get ns
NAME               STATUS      AGE
default            Active      27m 
kube-node-lease    Active      27m
kube-public        Active      27m
kube-system        Active      27m
[root@vms10 ~]#
复制代码

Step 2: There is a better tool for switching namespaces.

Execute the command wget ftp://ftp.hce.cc/cka-tool/kubens -P /bin/ on vms10 to download kubens to the /bin directory.

[root@vms10 ~]# chmod +x /bin/kubens 
[root@vms10 ~]#
复制代码

Step 3: View the current namespace.

[root@vms10 ~]# kubens
default
kube-node-lease
kube-public
kube-system
[root@vms10 ~]#
复制代码

Step 4: Create a new namespace ns1.

[root@vms10 ~]# kubectl create ns ns1
namespace/ns1 created
[root@vms10 ~]#
[root@vms10 ~]# kubectl get ns 
NAME              STATUS     AGE 
default           Active     29m 
kube-node-lease   Active     29m 
kube-public       Active     29m 
kube-system       Active     29m 
ns1               Active     8s 
[root@vms10 ~]#
复制代码

Step 5: Switch to the ns1 namespace.

[root@vms10 ~]# kubens ns1
Context "kubernetes-admin@kubernetes" modified.
Active namespace is "ns1".
[root@vms10 ~]#
[root@vms10 ~]# kubens
default
kube-public
kube-node-lease
kube-system
ns1
[root@vms10 ~]#
复制代码

Step 6: Switch to the default namespace.

[root@vms10 ~]# kubens default 
Context "kubernetes-admin@kubernetes" modified.
Active namespace is "default".
[root@vms10 ~]#
复制代码

Step 7: Delete namespace ns1.

[root@vms10 ~]# kubectl delete ns ns1 
namespace "ns1" deleted 
[root@vms10 ~]#
复制代码

You can also use the following commands to switch namespaces.

kubectl config set-context 集群名 --namespace=命名空间
复制代码

If the cluster does not switch, but only switches the namespace, you can also use the following command.

kubectl config set-context --current --namespace=命名空间