1、查看当前所有node的标签

[root@centos7_9 tomcat1]#kubectl get nodes --show-labels
NAME           STATUS                     ROLES    AGE     VERSION   LABELS
192.168.1.92   Ready,SchedulingDisabled   master   2d19h   v1.20.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=192.168.1.92,kubernetes.io/os=linux,kubernetes.io/role=master
192.168.1.96   Ready                      node     2d19h   v1.20.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=192.168.1.96,kubernetes.io/os=linux,kubernetes.io/role=node,node=first-node
192.168.1.97   Ready                      node     2d19h   v1.20.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=192.168.1.97,kubernetes.io/os=linux,kubernetes.io/role=node
192.168.1.98   Ready                      node     2d19h   v1.20.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=192.168.1.98,kubernetes.io/os=linux,kubernetes.io/role=node
192.168.1.99   Ready                      node     2d19h   v1.20.2   beta.kubernetes.io/arch=amd64,beta.kubernetes.io/os=linux,kubernetes.io/arch=amd64,kubernetes.io/hostname=192.168.1.99,kubernetes.io/os=linux,kubernetes.io/role=node

2、查看某个node的标签

[root@centos7_9 tomcat1]#kubectl describe node 192.168.1.96 
Name:               192.168.1.96
Roles:              node
Labels:             beta.kubernetes.io/arch=amd64
                    beta.kubernetes.io/os=linux
                    kubernetes.io/arch=amd64
                    kubernetes.io/hostname=192.168.1.96
                    kubernetes.io/os=linux
                    kubernetes.io/role=node
                    node=first-node
Annotations:        flannel.alpha.coreos.com/backend-data: {"VtepMAC":"3a:ff:a5:5c:09:d1"}
                    flannel.alpha.coreos.com/backend-type: vxlan
                    flannel.alpha.coreos.com/kube-subnet-manager: true
                    flannel.alpha.coreos.com/public-ip: 192.168.1.96
                    node.alpha.kubernetes.io/ttl: 0
                    volumes.kubernetes.io/controller-managed-attach-detach: true
CreationTimestamp:  Sun, 21 Aug 2022 20:07:24 +0800

3、node自定义标签

[root@centos7_9 tomcat1]#kubectl label node 192.168.1.97 project=k8snew
node/192.168.1.97 labeled
[root@centos7_9 tomcat1]#kubectl label node 192.168.1.97 node=second-node
node/192.168.1.97 labeled

[root@centos7_9 tomcat1]#kubectl describe node 192.168.1.97
Name:               192.168.1.97
Roles:              node
Labels:             beta.kubernetes.io/arch=amd64
                    beta.kubernetes.io/os=linux
                    kubernetes.io/arch=amd64
                    kubernetes.io/hostname=192.168.1.97
                    kubernetes.io/os=linux
                    kubernetes.io/role=node
                    node=second-node
                    project=k8snew
Annotations:        flannel.alpha.coreos.com/backend-data: {"VtepMAC":"6a:e7:a3:49:c9:bb"}
                    flannel.alpha.coreos.com/backend-type: vxlan
                    flannel.alpha.coreos.com/kube-subnet-manager: true
                    flannel.alpha.coreos.com/public-ip: 192.168.1.97
                    node.alpha.kubernetes.io/ttl: 0
                    volumes.kubernetes.io/controller-managed-attach-detach: true

4、yaml引用node的label示范

[root@centos7_9 haproxy]#vim haproxyDep.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  namespace: k8s-new
  name: haproxy-deployment
  labels:
    app: haproxy
spec:
  replicas: 1
  selector:
    matchLabels:
      app: haproxy
  template:
    metadata:
      labels:
        app: haproxy
    spec:
      containers:
      - name: haproxy
        image: www.shenqiqi.org/k8simages/haproxy-2.5.0:v1
        imagePullPolicy: IfNotPresent
        resources:
          requests:
            cpu: 200m
            memory: 200Mi
        ports:
        - containerPort: 9999
          protocol: TCP
          name: status
        - containerPort: 9527
          protocol: TCP
          name: haproxy01
      nodeSelector:         #注意必须配置在containers参数结束后的部分
        node: first-node    #之前配置的192.168.1.96节点的label

5、构建kubectl apply -f ./* ，查看构建只够分配到指定的label的节点

6、自定义node label的删除

[root@centos7_9 tomcat1]#kubectl label nodes 192.168.1.97 project-

命令格式即：kubectl label nodes node节点名称/nodeIP node对应的key-