pod节点亲和性

pod自身的亲和性调度有两种表示形式

podaffinity：pod和pod更倾向腻在一起，把相近的pod结合到相近的位置，如同一区域同一机架，这样的话pod和pod之间更好通信。

podunaffinity：pod和pod更倾向不腻在一起，如果部署两套程序，那么这两套程序更倾向于反亲和性，相互之间没有影响

示例：

vim pod-required-affinity-demo.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod-first
  labels:
    app2: myapp2
    tier: frontend
spec:
    containers:
    - name: myapp
      image: ikubernetes/myapp:v1
---
apiVersion: v1
kind: Pod
metadata:
  name: pod-second
  labels:
    app: backend
    tier: db
spec:
    containers:
    - name: busybox
      image: busybox:latest
      imagePullPolicy: IfNotPresent
      command: ["sh","-c","sleep 3600"]
    affinity:
      podAffinity:
         requiredDuringSchedulingIgnoredDuringExecution:
         - labelSelector:
              matchExpressions:
              - {key: app2, operator: In, values: ["myapp2"]}
           topologyKey: kubernetes.io/hostname

创建pod

kubectl apply -f pod-required-affinity-demo.yaml

查看pod的调度

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