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关键词: 

  ① requiredDuringSchedulingIgnoredDuringExecution：表示强匹配，必须要满足

  ② preferredDuringSchedulingIgnoredDuringExecution：表示弱匹配，尽可能满足，但不保证

示例：

apiVersion: v1
kind: Pod
metadata:name: with-node-affinity
spec:affinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:  ##必须满足下面匹配规则nodeSelectorTerms:- matchExpressions:- key: envoperator: In  ##逻辑运算符支持：In,NotIn,Exists,DoesNotExist,Gt,Ltvalues:- test- devpreferredDuringSchedulingIgnoredDuringExecution: ##尽可能满足，但不保证- weight: 1preference:matchExpressions:- key: projectoperator: Invalues:- aminglinuxcontainers:- name: with-node-affinityimage: redis:6.0.6

说明：

匹配逻辑：

① 同时指定Node Selector和Node Affinity，两者必须同时满足；

② Node Affinity中指定多组nodeSelectorTerms，只需要一组满足就可以；

③ 当在nodeSelectorTerms中包含多组matchExpressions，必须全部满足才可以；

演示示例：

编辑pod的yaml
cat > nodeAffinity.yaml << EOF
apiVersion: v1
kind: Pod
metadata:name: node-affinity
spec:containers:- name: my-containerimage: nginx:1.23.2affinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: special-nodeoperator: Exists
EOF给其中一个节点定义标签
kubectl label nodes k8s-worker2 special-node=true生效Pod yaml
kubectl apply -f nodeAffinity.yaml检查Pod所在node
root@k8s-master:/home/vagrant# kubectl get po -o wide
NAME            READY   STATUS    RESTARTS   AGE     IP             NODE          NOMINATED NODE   READINESS GATES
node-affinity   1/1     Running   0          3m47s   172.16.126.2   k8s-worker2   <none>           <none>