node选择器

定义

使用pod的Nodename 或  NodeSelector 字段调度到指定node节点

nodeName路径

[root@k8smaster4 ns]# kubectl explain pod.spec.nodeName

编写Yaml文件

[root@k8smaster4 ns]# vi pod-second.yaml

apiVersion: v1
kind: Pod
metadata:
   name: demo-pod
   namespace: default
   labels:
     app: myapp
     env: dev
spec: 
  nodeName: k8snode4
  containers:
  - name: tomcat-pod-java
    ports:
    - containerPort: 8080
    image: docker.io/xianchao/tomcat-8.5-jre8:v1
    imagePullPolicy: IfNotPresent
  - name: busybox
    image: docker.io/library/busybox:1.28
    command:
    - "/bin/sh"
    - "-c"
    - "sleep 3600"

进入Pod某个容器

[root@k8smaster4 ns]# kubectl exec -it demo-pod -c tomcat-pod-java -- /bin/bash

nodeSelector 路径

[root@k8smaster4 ns]# kubectl explain pod.spec.nodeSelector

查看Node标签

[root@k8smaster4 ns]# kubectl get nodes --show-labels

编写nodeSelectorYaml

[root@k8smaster4 ns]# cat node-select.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: node-seletor
  namespace: default
  labels:
    app: myapp-1
    env: env
spec:
  nodeSeletor:
    disk: ceph
  containers:
  - name: tomcat-pod-java
    ports:
    - containerPort: 8080
    image: docker.io/xianchao/tomcat-8.5-jre8
    imagePullPolicy: IfNotPresent

查看Pod详细信息

[root@k8smaster4 ns]# kubectl describe pod node-selector

添加node标签

[root@k8smaster4 ns]# kubectl label node k8snode4 disk=ceph

查看node标签

[root@k8smaster4 ns]# kubectl get  nodes  --show-labels

查看某个node标签

[root@k8smaster4 ns]# kubectl get  nodes  k8snode4 --show-labels

删除node标签

[root@k8smaster4 ns]# kubectl label nodes k8snode4 disk-