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
### 创建 2 个环境 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：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 <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
