k8s--如何使用Namespaces

Namespaces 使用示例

• Viewing namespaces
• Creating a new namespace
• Deleting a namespace
• Subdividing your cluster using Kubernetes namespaces

Viewing namespaces

[root@tvm-00 test]# kubectl get namespaces NAME STATUS AGE default Active 5d kube-public Active 5d kube-system Active 5d

Creating a new namespace

[root@tvm-00 ~]# cat ~/k8s_install/test/ns/dev.yaml apiVersion: v1 kind: Namespace metadata: name: ns-dev labels: name: envDev [root@tvm-00 ~]# kubectl apply -f ~/k8s_install/test/ns/dev.yaml namespace "ns-dev" created [root@tvm-00 ~]# kubectl get ns NAME STATUS AGE default Active 5d kube-public Active 5d kube-system Active 5d ns-dev Active 26s [root@tvm-00 ~]# kubectl describe namespaces/ns-dev Name: ns-dev Labels: name=envDev Annotations: kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Namespace","metadata":{"annotations":{},"labels":{"name":"envDev"},"name":"ns-dev","namespace":""}} Status: Active No resource quota. No resource limits.

Deleting a namespace

[root@tvm-00 ~]# kubectl delete namespaces/ns-dev namespace "ns-dev" deleted [root@tvm-00 ~]# kubectl get ns NAME STATUS AGE default Active 5d kube-public Active 5d kube-system Active 5d ns-dev Terminating 1m [root@tvm-00 ~]# kubectl get ns NAME STATUS AGE default Active 5d kube-public Active 5d kube-system Active 5d

Subdividing your cluster using Kubernetes namespaces

### 建立 2 個環境 envDev, envTest [root@tvm-00 ~]# cat ~/k8s_install/test/ns/test.yaml apiVersion: v1 kind: Namespace metadata: name: ns-test labels: name: envTest [root@tvm-00 ~]# kubectl apply -f ~/k8s_install/test/ns/dev.yaml [root@tvm-00 ~]# kubectl apply -f ~/k8s_install/test/ns/test.yaml [root@tvm-00 ~]# kubectl get ns --show-labels NAME STATUS AGE LABELS default Active 5d <none> kube-public Active 5d <none> kube-system Active 5d <none> ns-dev Active 7m name=envDev ns-test Active 2m name=envTest 注意：這裏的例子是使用的kubectl命令行方式，實際使用仍是yaml配置文件清晰好用 ### 假設咱們要將服務 s1 的版本 0.9 發佈到 envDev，服務 s1 的版本 0.7 發佈到 envTest [root@tvm-00 ~]# kubectl -n ns-dev run s1 --image=opera443399/whoami:0.9 --replicas=2 deployment "s1" created [root@tvm-00 ~]# kubectl get deploy NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE app-whoami 3 3 3 3 1h [root@tvm-00 ~]# kubectl get deploy -n ns-dev NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE s1 2 2 2 2 18s [root@tvm-00 ~]# kubectl -n ns-test run s1 --image=opera443399/whoami:0.7 --replicas=2 deployment "s1" created [root@tvm-00 ~]# kubectl get deploy -n ns-test NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE s1 2 2 2 2 10s [root@tvm-00 ~]# kubectl -n ns-dev describe deploy -l run=s1 |grep Image Image: opera443399/whoami:0.9 [root@tvm-00 ~]# kubectl -n ns-test describe deploy -l run=s1 |grep Image Image: opera443399/whoami:0.7 [root@tvm-00 ~]# kubectl -n ns-dev expose deployments/s1 --type="NodePort" --port 80 service "s1" exposed [root@tvm-00 ~]# kubectl -n ns-test expose deployments/s1 --type="NodePort" --port 80 service "s1" exposed [root@tvm-00 ~]# kubectl -n ns-dev get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE s1 NodePort 10.97.87.8 <none> 80:31176/TCP 28s [root@tvm-00 ~]# kubectl -n ns-test get services NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE s1 NodePort 10.98.122.214 <none> 80:30946/TCP 26s [root@tvm-00 ~]# curl -s tvm-00:31176 |grep version [howto] version: 0.9 [root@tvm-00 ~]# curl -s tvm-00:30946 |grep version [howto] version: 0.7