pod亲和性（Affinity）清单

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-deployment
  namespace: test
spec:
  replicas: 1
  selector:
    matchLabels:
      environment: stg
  template:
    metadata:
      labels:
        environment: stg
    spec:
      containers:
      - name: nginx-container
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports:
        - name: nginx-port
          containerPort: 80
          protocol: TCP
        lifecycle:
          postStart:
            exec:
              command: ["/bin/sh","-c","echo jiayouba!!!!!>/usr/share/nginx/html/index.html"]
      affinity:  #亲和性设置
        podAffinity: #设置pod亲和性
          requiredDuringSchedulingIgnoredDuringExecution: #硬限制
          - labelSelector:
              matchExpressions: # 匹配env的值在["xxx","yyy"]中的标签
              - key: podenv
                operator: In
                values: ["xxx","yyy"]
            topologyKey: kubernetes.io/hostname