ValidatingWebhookConfiguration 不会在没有创建注释的情况下停止 pod

Question

我正在尝试构建一个准入控制器来在我们的集群上强制执行 pod 注释。 我能够构建一个 webhook 服务并部署它。出于测试目的，我将服务器代码更改为以 Allowed: false 作为对任何请求的默认响应，但它不会阻止创建 pod。

在日志中，我看到请求到达服务器，但似乎 kubeapi-server 没有接收或不遵守响应。

2021/01/25 02:29:15 &AdmissionResponse{UID:,Allowed:false,Result:&v1.Status{ListMeta:ListMeta{SelfLink:,ResourceVersion:,Continue:,RemainingItemCount:nil,},Status:,Message:,Reason:,Details:nil,Code:0,},Patch:nil,PatchType:nil,AuditAnnotations:map[string]string{},Warnings:[],}

以下是服务部署文件和验证 webhook 配置。 感谢任何想法/建议！

apiVersion: apps/v1
kind: Deployment
metadata:
  name: webhook-server
  namespace: webhook-demo
  labels:
    app: webhook-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app: webhook-server
  template:
    metadata:
      labels:
        app: webhook-server
    spec:
      securityContext:
        runAsNonRoot: true
        runAsUser: 1234
      containers:
        - name: webhook-server
          image: demo/admission-controller-webhook-demo:latest
          imagePullPolicy: Never
          ports:
            - containerPort: 8443
              name: webhook-api
          resources:
            requests:
              cpu: "100m"
              memory: "128M"
            limits:
              cpu: "250m"
              memory: "256M"
          volumeMounts:
            - name: webhook-tls-certs
              mountPath: /run/secrets/tls
              readOnly: true
      volumes:
        - name: webhook-tls-certs
          secret:
            secretName: webhook-server-tls
---
apiVersion: v1
kind: Service
metadata:
  name: webhook-server
  namespace: webhook-demo
spec:
  selector:
    app: webhook-server
  ports:
    - port: 443
      targetPort: webhook-api
---
apiVersion: admissionregistration.k8s.io/v1beta1
kind: ValidatingWebhookConfiguration
metadata:
  name: webhook-server
webhooks:
  - name: webhook-server.webhook-demo.svc
    rules:
      - apiGroups: ["*"]
        apiVersions: ["*"]
        operations: ["CREATE","UPDATE"]
        resources: ["pods","deployments", "replicasets"]
    timeoutSeconds: 5
    clientConfig:
      service:
        name: webhook-server
        namespace: webhook-demo
        path: "/validate"
      caBundle: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0t<truncated>
    sideEffects: None
    admissionReviewVersions: ["v1beta1"]

Answer 1

我在响应中发送了准入响应对象，但 API 服务器实际上需要封装准入响应和请求对象的准入审查对象。 :掌心