Taints&Tolerations

定义

taints 是键值数据，用在node上，定义污点
toleration 是键值数据，用在pod上，定义容忍度，能容忍哪些污点

taints 查看路径

[root@k8smaster4 ~]# kubectl explain node.spec.taints

taints 排斥等级

NoSchedule： scheduler执行控制，不影响已运行在node上的pod
NoExecute: NodeController执行控制，影响已运行在node上的pod
PreferNoSchedule：scheduler执行控制，最好不运行新的pod在污点node

Tolerations 查看路径

[root@k8smaster4 ~]# kubectl explain pod.spec.tolerations

node 新增污点

[root@k8smaster4 ~]# kubectl taint node k8snode4 node-type=production:NoSchedule

查看新增污点

[root@k8smaster4 ~]# kubectl describe node k8snode4 | grep node-type
Taints:             node-type=production:NoSchedule

编写无容忍度Pod

[root@k8smaster4 ns]# cat pod-taint.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: taint-pod
  namespace: default
  labels:
    tomcat: tomcat-pod
spec:
  containers:
  - name: taint-pod
    ports:
    - containerPort: 8080
    image: docker.io/xianchao/tomcat-8.5-jre8:v1
    imagePullPolicy: IfNotPresent

编写容忍度Pod

[root@k8smaster4 ns]# vi pod-toleration.yaml
apiVersion: v1
kind: Pod
metadata:
  name: myapp-deploy
  namespace: default
  labels:
    environment: production
    app: tomcat
spec:
  containers:
  - name: tomcat-app
    image: docker.io/xianchao/tomcat-8.5-jre8:v1
    imagePullPolicy: IfNotPresent
    ports:
    - name: http
      containerPort: 8080
  tolerations:
  - key: "node-type"
    operator: "Equal"
    value: "production"
    effect: "NoExecute" 
    tolerationSeconds: 3600

动态查看Pod状态

[root@k8smaster4 ns]# kubectl get pods -owide -w