实战生产环境：最新K8s Lables详解

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Labels官网

https://kubernetes.io/docs/co...

Labels介绍

字面意思就是标签，也就是给我们不同的Pod或者Controller等打上不同的标签，从而实现以下功能：

• 标示元信息
• Controller 和 Service 可通过 label selector 控制 Pod 生命周期
• 对调度产生影响

Lables查看

[root@master01 ~]# kubectl get nodes --show-labels
NAME       STATUS   ROLES    AGE   VERSION   LABELS
master01   Ready    master   11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master01,kubernetes.io/os=linux,node-role.kubernetes.io/master=
node01     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=
node02     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node02,kubernetes.io/os=linux,node-role.kubernetes.io/work=

Lables创建

请记住，标签的格式是<Key: Value>格式，Key对于给定的值必须是唯一的。

1、使用yaml给Pod创建标签

[root@master01 ~]# cat pod-labels.yaml
apiVersion: v1
kind: Pod
metadata:
  name: label-demo
  labels:
    environment: production
    app: nginx
spec:
  containers:
  - name: nginx
    image: nginx:1.7.9
    ports:
    - containerPort: 80
[root@master01 ~]# kubectl apply -f pod-labels.yaml
pod/label-demo created
[root@master01 ~]# kubectl get pods --show-labels
NAME         READY   STATUS    RESTARTS   AGE   LABELS
label-demo   1/1     Running   0          65s   app=nginx,environment=production

2、使用命令行创建标签

[root@master01 ~]# kubectl get nodes --show-labels
NAME       STATUS   ROLES    AGE   VERSION   LABELS
master01   Ready    master   11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=master01,kubernetes.io/os=linux,node-role.kubernetes.io/master=
node01     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=
node02     Ready    work     11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node02,kubernetes.io/os=linux,node-role.kubernetes.io/work=
[root@master01 ~]# kubectl label nodes node01 disktype=ssd
node/node01 labeled
[root@master01 ~]# kubectl get nodes node01 --show-labels
NAME     STATUS   ROLES   AGE   VERSION   LABELS
node01   Ready    work    11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,disktype=ssd,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=

Lables删除

[root@master01 ~]# kubectl label nodes node01 disktype-
node/node01 labeled
[root@master01 ~]# kubectl get nodes node01 --show-labels
NAME     STATUS   ROLES   AGE   VERSION   LABELS
node01   Ready    work    11h   v1.15.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=node01,kubernetes.io/os=linux,node-role.kubernetes.io/work=