04 标签管理

01 响应式管理标签

01-1 查看资源标签

[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          42m   <none>
xy       1/1     Running   0          42m   <none>

图1 查看资源标签

01-2 给资源打标签

[root@master yaml]# kubectl label pod likexy school=ucas class=bs
pod/likexy labeled
[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          45m   class=bs,school=ucas
xy       1/1     Running   0          45m   <none>

图2 打标签

01-3 修改标签

[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          59m   class=bs,school=ucas
xy       1/1     Running   0          59m   <none>
[root@master yaml]# kubectl label pods likexy class=ys --overwrite
pod/likexy labeled
[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          60m   class=ys,school=ucas
xy       1/1     Running   0          60m   <none>

图3 修改class的标签

01-4 删除标签

[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          65m   class=ys,school=ucas
xy       1/1     Running   0          65m   <none>
[root@master yaml]# kubectl label pods likexy class-
pod/likexy unlabeled
[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          66m   school=ucas
xy       1/1     Running   0          66m   <none>

图4 删除标签

01-5 基于标签过滤数据

[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          69m   school=ucas
xy       1/1     Running   0          69m   <none>
[root@master yaml]# kubectl get pods -l school
NAME     READY   STATUS    RESTARTS   AGE
likexy   1/1     Running   0          69m
[root@master yaml]# kubectl get pods -l school!=ucas
NAME   READY   STATUS    RESTARTS   AGE
xy     1/1     Running   0          69m

图5 基于标签过滤数据

02 声明式管理标签

[root@master yaml]# cat 07-lable.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: likexy
  labels:
    school: ucas
    class: ss
spec:
  hostNetwork: true
  nodeName: node01
  containers:
  - name: sql
    image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
    imagePullPolicy: IfNotPresent
    env:
    - name: MYSQL_ALLOW_EMPTY_PASSWORD
      value: "yes"
    - name: MYSQL_USER
      value: "xy"
    - name: MYSQL_PASSWORD
      value: "123123"
    - name: MYSQL_DATABASE
      value: "xy"
[root@master yaml]# kubectl get pods --show-labels
NAME     READY   STATUS    RESTARTS   AGE   LABELS
likexy   1/1     Running   0          90s   class=ss,school=ucas

图6 查看声明式创建Pod的标签

# 声明式和响应式的区别:
	# 相同点:
		# 都可以管理资源。
	# 不同点:
		# 声明式修改后需要使用apply指令进行应用才能生效;
		# 响应式会立即生效