參考：https://kubernetes.io/zh/docs/tasks/configure-pod-container/assign-pods-nodes-using-node-affinity/

給節點新增標籤

kubectl label nodes <your-node-name> disktype=ssd
kubectl get nodes --show-labels

依據強制的節點親和性排程 Pod

下面清單描述了一個 Pod，它有一個節點親和性配置 requiredDuringSchedulingIgnoredDuringExecution，disktype=ssd。 這意味著 pod 只會被排程到具有 disktype=ssd 標籤的節點上。

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: disktype
            operator: In
            values:
            - ssd            
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent
 

使用首選的節點親和性排程 Pod

本清單描述了一個Pod，它有一個節點親和性設定 preferredDuringSchedulingIgnoredDuringExecution，disktype: ssd。 這意味著 pod 將首選具有 disktype=ssd 標籤的節點。

apiVersion: v1
kind: Pod
metadata:
  name: nginx
spec:
  affinity:
    nodeAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: disktype
            operator: In
            values:
            - ssd          
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent