20、Kubernetes 調度器 - 固定節點

指定調度節點

1、Pod.spec.nodeName 將 Pod 直接調度到指定的 Node 節點上，會跳過 Scheduler 的調度策略，該匹配規則是強制匹配

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myweb
spec:
  replicas: 8
  selector:
    matchLabels:
      app: myweb
  template:
    metadata:
      labels:
        app: myweb
    spec:
      nodeName: k8s-node01
      containers:
      - name: myweb-container
        image: wangyanglinux/myapp:v1
        ports:
        - containerPort: 80

2、Pod.spec.nodeSelector：通過 kubernetes 的 label-selector 機制選擇節點，由調度器調度策略匹配 label，而後調度 Pod 到目標節點，該匹配規則屬於強制約束

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myweb
spec:
  replicas: 2
  selector:
    matchLabels:
      app: myweb
  template:
    metadata:
      labels:
        app: myweb
    spec:
      nodeSelector:
        LABEL: LABEL-VALUE
      containers:
      - name: myweb
        image: wangyanglinux/myapp:v1
        ports:
        - containerPort: 80