pod调度具体会调度到哪个节点呢？这里就涉及到node亲和性的问题
node节点亲和性nodeAffinity
硬亲和性：requiredDuringSchedulingIgnoredDuringExecution，必须满足
软亲和性：preferredDuringSchedulingIgnoredDuringExecution，最好满足
# 硬亲和性
vi pod-nodeaffinity-demo.yaml
kind: Pod
metadata:name: pod-node-affinity-demonamespace: defaultlabels:app: myapptier: frontend
spec:affinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: zoneoperator: Invalues:- foo- barcontainers:- name: myappimage: 172.16.80.140/nginx/nginx:1.26imagePullPolicy: IfNotPresent
kubectl describe pod pod-node-affinity-demo# pod处于pending状态，原因是没有符合硬亲和性条件的node节点
# 在node02上打上标签 zone=foo或者zone=bar，那先pod被调度到node02节点
# 软亲和性，如果没有符合条件的就忽略，weight是相对权重，权重越高，pod调度的几率越大
vi pod-nodeaffinity-demo-2.yaml
kind: Pod
metadata:name: pod-node-affinity-demo-2namespace: defaultlabels:app: myapptier: frontend
spec:containers:- name: myappimage: 172.16.80.140/nginx/nginx:1.26imagePullPolicy: IfNotPresentaffinity:nodeAffinity:preferredDuringSchedulingIgnoredDuringExecution:- preference:matchExpressions:- key: zone1operator: Invalues:- foo1- bar1weight: 10- preference:matchExpressions:- key: zone2operator: Invalues:- foo2- bar2weight: 20
kubectl apply -f pod-nodeaffinity-demo-2.yaml