指定调度节点

I、Pod.spec.nodeName 将 Pod 直接调度到指定的Node节点上，会跳过 Scheduler 的调度策略，该匹配规则是强制匹配

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: myweb
spec:
  replicas: 7
  template:
    metadata:
      labels:
        app: myweb
    spec:
      nodeName: k8s-node1
      containers:
      - name: myweb
        image: harbor.bwingame8.com/library/myapp:v2
        ports:
        - containerPort: 80

II、Pod.spec.nodeSelector: 通过kubernetes 的 label-selector 机制选择节点，由调度器调度策略匹配label，而后调度Pod到目标节点，该匹配规则属于强制约束

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: myweb
spec:
  replicas: 2
  template:
    metadata:
      labels:
        app: myweb
    spec:
      nodeSelector:
        disk: ssd
      containers:
      - name: myweb
        image: harbor.bwingame8.com/library/myapp:v2
        ports:
        - containerPort: 80