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 namespacesNAME STATUS AGEdefault Active 5dkube-public Active 5dkube-system Active 5d
Creating a new namespace
[root@tvm-00 ~]# cat ~/k8s_install/test/ns/dev.yamlapiVersion: v1kind: Namespacemetadata: name: ns-dev labels: name: envDev[root@tvm-00 ~]# kubectl apply -f ~/k8s_install/test/ns/dev.yamlnamespace "ns-dev" created[root@tvm-00 ~]# kubectl get nsNAME STATUS AGEdefault Active 5dkube-public Active 5dkube-system Active 5dns-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-devnamespace "ns-dev" deleted[root@tvm-00 ~]# kubectl get nsNAME STATUS AGEdefault Active 5dkube-public Active 5dkube-system Active 5dns-dev Terminating 1m[root@tvm-00 ~]# kubectl get nsNAME STATUS AGEdefault Active 5dkube-public Active 5dkube-system Active 5d
Subdividing your cluster using Kubernetes namespaces
### 创建 2 个环境 envDev, envTest[root@tvm-00 ~]# cat ~/k8s_install/test/ns/test.yamlapiVersion: v1kind: Namespacemetadata: 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 kube-public Active 5d kube-system Active 5d ns-dev Active 7m name=envDev ns-test Active 2m name=envTest 注意：这里的例子是使用的kubectl命令行方式，实际使用还是yaml配置文件清晰好用 ### 假设我们要将服务 s1 的版本 0.9 发布到 envDev，服务 s1 的版本 0.7 发布到 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 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 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