我的K8服务在不明确公开端口的情况下如何访问？

Question

我正在运行K8S中的HTTP服务器，可以通过呼叫https：//e2e-test-runner.hogwarts.svc.cluster.local 但是，我没有明确配置的服务端口。这是如何运作的？

当没有服务端口时，K8S将容器端口作为服务端口？

这是我的服务定义：

apiVersion: v1
kind: Service
metadata:
  name: e2e-test-runner
  namespace: hogwarts
spec:
  selector:
    app: e2e-test-runner

这是我的部署定义：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: e2e-test-runner
  namespace: hogwarts 
spec:
  strategy:
    rollingUpdate:
      maxSurge: 3
      maxUnavailable: 0
  revisionHistoryLimit: 3
  selector:
    matchLabels:
      app: e2e-test-runner
  template:
    metadata:
      labels:
        app: e2e-test-runner
        app.kubernetes.io/name: e2e-test-runner
    spec:
      containers:
        - name: app
          image: $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/e2e-test-runner:$IMAGE_VERSION
          ports:
            - containerPort: 3000
          resources:
            requests:
              memory: "250Mi"
              cpu: "100m"
            limits:
              memory: "1Gi"
              cpu: "1000m"
          livenessProbe:
            httpGet:
              path: /health_check
              port: 3000
              scheme: "HTTPS"
            initialDelaySeconds: 20
            periodSeconds: 10
            timeoutSeconds: 2
          readinessProbe:
            httpGet:
              path: /health_check
              port: 3000
              scheme: "HTTPS"
            initialDelaySeconds: 10
            periodSeconds: 10
            timeoutSeconds: 5
      # Gives pod 15 seconds to complete any outstanding requests before being force killed
      terminationGracePeriodSeconds: 15