nodeSelector 强制匹配

 指定pod 调度到标签 ssd

[root@k8s-master cka3]# cat ssd.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: nginx-kusc00401
spec:
  containers:
  - name: nginx
    image: nginx
    imagePullPolicy: IfNotPresent
  nodeSelector:
    disktype: ssd

 这里显示亲和性不够

 

 我们现在给节点加上标签：kubectl label nodes <node-name>  <node-key>=<label-value>

[root@k8s-master cka3]# kubectl label nodes k8s-node2 disktype=ssd
node/k8s-node2 labeled

 再次查看调度成功

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删除标签：

[root@k8s-master cka3]# kubectl label node k8s-node2 disktype-
node/k8s-node2 labeled

-------------------------------------------------------------------------------------------------------------------------------

nodeAffinity: 调度分为软性:尝试满足，但不保证（preferred）  硬性：一定满足 (required）

[root@k8s-master cka3]# cat test.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: with-node-affinity
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: disktype
            operator: In
            values:
            - ssd
            
      preferredDuringSchedulingIgnoredDuringExecution:
      - weight: 1
        preference:
          matchExpressions:
          - key: disktype
            operator: In
            values:
            - ssd2
  containers:
  - name: with-node-affinity
    image: nginx

软匹配不一定成功