docker - 在不同节点上运行两个 kubernetes pod

Question

有没有办法告诉 Kubernetes 永远不要在同一个节点上运行两个 Pod，例如我有两个 Pod 副本，我希望它们始终分布在 zone1/zone2 上，而不是分布在同一区域在一起。

apiVersion: app/v1
kind: Deployment
metadata:
  name: testApp
  labels:
    app: testApp-front
  namespace: 
spec:
  replicas: 2
  selector:
    matchLabels:
      app: testApp-front
  template:
    metadata:
      labels:
        app: testApp-front
    spec:      
      nodeSelector:
        failure-domain.beta.kubernetes.io/zone: zone1

Answer 1

似乎可以通过 Interpod Affinity 来完成，您可以看到:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-server
spec:
  selector:
    matchLabels:
      app: testApp-front
  replicas: 3
  template:
    metadata:
      labels:
        app: testApp-front
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - testApp-front
            topologyKey: "kubernetes.io/hostname"
        podAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: app
                operator: In
                values:
                - store
            topologyKey: "kubernetes.io/hostname"
      containers:
      - name: web-testApp-front
        image: nginx:1.12-alpine

您可以看到完整的example here