使用 podAffinity 和 podAntiaffinity 时验证 matchExpression 时出错

Question

我正在尝试为要部署在 GCP 集群内的不同节点中的部署副本创建 podAffinity，我已遵循此站点https://thenewstack.io/implement-node-and-pod-affinity-上的文档anti-affinity-in-kubernetes-a-practical-example/但在执行 apply 时出现此错误：

error: error validating ".\\K8s\\6flask-deployment.yaml": error validating data: ValidationError(Deployment.spec.template.spec.affinity.podAntiAffinity.requiredDuringSchedulingIgnoredDuringExecution[0].labelSelector): unknown field "MatchExpressions" in io.k8s.apimachinery.pkg.apis.meta.v1.LabelSelector;

这是我的flask-deployment.yaml。我尝试将其也设置在第一个规范下，但它也不起作用

apiVersion: apps/v1
kind: Deployment
metadata:
  name: flask-deployment
  namespace: flask-app
spec:
  replicas: 2
  selector:
    matchLabels:
      app: flask-app
      deploy: separate
      run: together
  template:
    metadata:
      labels:
        app: flask-app
        deploy: separate
        run: together
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              MatchExpressions:
                - key: deploy
                  operator: In
                  values:
                  - separate
            topologyKey: kubernetes.io/hostname  
      containers:

难道是身份识别错误？kubernetes linter 没有标记任何内容，我一直在与 SO 和网络上的其他示例进行比较，但我找不到错误

Answer 1

您指定的任何键值matchExpressions也需要位于labelspodmatchLabels中spec而不是metadata部分中。它应该如下所示

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mongodb-deployment
  namespace: flask-app
spec:
  replicas: 2  
  selector:
    matchLabels:
      deploy: separate
  template:
    metadata:
      labels:
        deploy: separate
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
          - labelSelector:
              matchExpressions:
              - key: deploy
                operator: In
                values:
                - separate
            topologyKey: "kubernetes.io/hostname"