Java/Micronaut 的 Kube.netes 部署错误：ERR_CONNECTION_REFUSED

Question

I am trying to deploy an app having 3 services - frontend (Angular), backend 1 (Java/Micronaut), and backend 2 (Java/Micronaut).

My frontend works properly but the Java apps are not working.

Sometimes, I observed it started after 20 min. of deploying a Java app, but this time it does not work even after 1 hr.

Deployment, pod service - all are in running state in Kube.netes, but when I try to hit the URL I see below error:

deployment.yaml for java app

apiVersion: apps/v1
kind: Deployment
metadata:
  name: authentication-deploy
  labels:
    name: authentication-deploy
    app: supply-chain-app
spec:
  replicas: 1
  selector:
    matchLabels:
      name: authentication-pod
      app: supply-chain-app

  template:
    metadata:
      name: authentication-pod
      labels:
        name: authentication-pod
        app: supply-chain-app
    spec:
      containers:
        - name: authentication
          image: cawishika/authentication-service:1.1
          ports:
            - containerPort: 80

service.yaml for java app

apiVersion: v1
kind: Service
metadata:
  name: authentication-service
  labels:
    name: authentication-service
    app: supply-chain-app
spec:
  type: NodePort
  ports:
    - port: 80
      targetPort: 80
      nodePort: 30006
  selector:
    name: authentication-pod
    app: supply-chain-app

Docker file

FROM adoptopenjdk/openjdk11:latest
EXPOSE 8002
ADD target/authentication-service-0.1.jar authentication-service-0.1.jar
ENTRYPOINT ["java", "-jar", "/authentication-service-0.1.jar"]

kubectl logs podname

Answer 1

Your Dockerfile is exposing port 8002 ( EXPOSE 8002 ), but your app is started on port 8080 .

Additionally, your Kube.netes configuration is pointing to port 80 of your pod.

You should set it so that all three configurations use the same port.