kubernetes---namespace(命名空间)

1.查看namespace

[root@k8s-master1 ~]# kubectl get namespaces # namespaces可以简写namespace或ns
NAME              STATUS   AGE
default           Active   130m	# 所有未指定Namespace的对象都会被默认分配在default命名空间
kube-node-lease   Active   130m	
kube-public       Active   130m	# 此命名空间下的资源可以被所有人访问
kube-system       Active   130m # 所有由Kubernetes系统创建的资源都处于这个命名空间

2.查看namespace里的资源

kubectl get all --namespace=kube-system
NAME                                             READY   STATUS    RESTARTS   AGE
pod/calico-kube-controllers-7fdc86d8ff-cskfq     1/1     Running   3          5d1h
pod/calico-node-9dpc9                            1/1     Running   2          5d1h
pod/calico-node-jdmxw                            1/1     Running   3          5d1h
pod/calico-node-krwps                            1/1     Running   2          5d1h
pod/calico-node-tttlr                            1/1     Running   2          5d1h
pod/coredns-65dbdb44db-mm7cr                     1/1     Running   2          5d1h
pod/dashboard-metrics-scraper-545bbb8767-q66bc   1/1     Running   2          5d1h
pod/kubernetes-dashboard-65665f84db-nll6k        1/1     Running   4          5d1h
pod/metrics-server-869ffc99cd-8f4jd              1/1     Running   3          5d1h
 
NAME                                TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                  AGE
service/dashboard-metrics-scraper   ClusterIP   10.2.246.128   <none>        8000/TCP                 5d1h
service/kube-dns                    ClusterIP   10.2.0.2       <none>        53/UDP,53/TCP,9153/TCP   5d1h
service/kubernetes-dashboard        NodePort    10.2.213.30    <none>        443:21351/TCP            5d1h
service/metrics-server              ClusterIP   10.2.232.121   <none>        443/TCP                  5d1h
 
NAME                         DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                 AGE
daemonset.apps/calico-node   4         4         4       4            4           beta.kubernetes.io/os=linux   5d1h
 
NAME                                        READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/calico-kube-controllers     1/1     1            1           5d1h
deployment.apps/coredns                     1/1     1            1           5d1h
deployment.apps/dashboard-metrics-scraper   1/1     1            1           5d1h
deployment.apps/kubernetes-dashboard        1/1     1            1           5d1h
deployment.apps/metrics-server              1/1     1            1           5d1h
 
NAME                                                   DESIRED   CURRENT   READY   AGE
replicaset.apps/calico-kube-controllers-7fdc86d8ff     1         1         1       5d1h
replicaset.apps/coredns-65dbdb44db                     1         1         1       5d1h
replicaset.apps/dashboard-metrics-scraper-545bbb8767   1         1         1       5d1h
replicaset.apps/kubernetes-dashboard-65665f84db        1         1         1       5d1h
replicaset.apps/metrics-server-869ffc99cd              1         1         1       5d1h

3.创建namespace

3.1.命令创建

 kubectl create namespace ns1
namespace/ns1 created
 
[root@k8s-master1 ~]# kubectl get ns
NAME              STATUS   AGE
default           Active   5d1h
kube-node-lease   Active   5d1h
kube-public       Active   5d1h
kube-system       Active   5d1h
ns1               Active   10s

3.2.yaml文件创建

vim create_ns2.yml
apiVersion: v1 
kind: Namespace 
metadata: 
  name: ns2 

使用kubectl apply -f 创建
kubectl apply -f create_ns2.yml
namespace/ns2 created

查看
kubectl get ns
NAME              STATUS   AGE
default           Active   5d2h
kube-node-lease   Active   5d2h
kube-public       Active   5d2h
kube-system       Active   5d2h
ns1               Active   10m
ns2               Active   46s

4.删除namespace

4.1.命令删除

# kubectl delete namespace ns1
namespace "ns1" deleted

4.2.YAML文件删除

# kubectl delete -f create_ns2.yml
namespace "ns2" deleted