I am running zuul in a docker container, but I cant connect to it via postman on my local host (windows 10)

Question

I have 3 services zuul, eureka, and a rest service. Running the code locally via springboot works and I can use the url

http://localhost:8080/account/bank/account/

But when I dockerise it 

The eurka application.yml

server:
  port: '8761'
spring:
  application:
    name: eureka-service
eureka:
  client:
    fetchRegistry: 'false'
    registerWithEureka: 'false'

Eureka local.dockerfile

FROM adoptopenjdk:16.0.1_9-jdk-hotspot-focal

EXPOSE 8761

RUN mkdir /app
COPY target/eureka-service.jar /app
WORKDIR /app
ENTRYPOINT ["java", "-jar", "/app/eureka-service.jar"]

The zuul application.yml

spring:
  application:
    name: zuul-service
server:
  port: '8080'

eureka:
  client:
    instance:
      preferIpAddress: 'true'
    fetchRegistry: 'true'
    registerWithEureka: 'true'
    serviceUrl:
      defaultZone: http://172.21.0.2:8761/eureka
zuul:
  routes:
    account:
      path: /account/**
      serviceId: account-service

zuul local.dockerfile

FROM adoptopenjdk:16.0.1_9-jdk-hotspot-focal

EXPOSE 8080

RUN mkdir /app
COPY target/zuul-service.war /app
WORKDIR /app
ENTRYPOINT ["java", "-jar", "/app/zuul-service.war"]

the rest application.yml

spring:
  application:
    name: account-service
server:
  port: '8082'

eureka:
  client:
    instance:
      preferIpAddress: 'true'
    fetchRegistry: 'true'
    registerWithEureka: 'true'
    serviceUrl:
      defaultZone: http://172.21.0.2:8761/eureka

rest local.dockerfile

FROM adoptopenjdk:16.0.1_9-jdk-hotspot-focal

EXPOSE 8082

RUN mkdir /app
COPY target/account-service.war /app
WORKDIR /app
ENTRYPOINT ["java", "-jar", "/app/account-service.war"]

I have two docker-compose files. Mainly through experimenting with trying to publish the ports. Eureka and rest

version: "3"
services:
  eureka-service:
    image: eureka-service
    container_name: eureka-service
    build:
      context: ../../eureka-service
      dockerfile: local.dockerfile
    ports:
      - "8761:8761"
    networks:
      - banking-network
  account-service:
    image: account-service
    container_name: account-service
    build:
      context: ../../account-service
      dockerfile: local.dockerfile
    ports:
      - "8082:8082"
    depends_on:
      - eureka-service
    environment:
      - eureka.client.service-url.defaultZone=http://172.21.0.2:8761/eureka
    networks:
      - banking-network

networks:
  banking-network:
    external:
      name: banking-network

zuul

version: "3"
services:
  zuul-service:
    image: zuul-service
    container_name: zuul-service
    build:
      context: ../../zuul-service
      dockerfile: local.dockerfile
    ports:
      - "8080:8080"

    environment:
      - eureka.client.service-url.defaultZone=http://172.21.0.2:8761/eureka
    networks:
      - banking-network

networks:
  banking-network:
    external:
      name: banking-network

when I run docker-compose up on both docker-compose zuul and application is registered with eureka

But in postman when I run http://localhost:8080/account/bank/account/ it fails.

If I am correct I need to publish zuul-service port to the host. But this is where I am having real problems

So following the docker docs I run the following on the zuul docker-compose

docker-compose run --publish 8080:8080 zuul-service

running docker ps

CONTAINER ID   IMAGE             COMMAND                  CREATED              STATUS              PORTS                    NAMES
ea2957b56646   zuul-service      "java -jar /app/zuul…"   About a minute ago   Up About a minute   0.0.0.0:8080->8080/tcp   gateway_zuul-service_run_c3988736de38

Zuul and account are registered But neither URLs work

http://localhost:8080/account/bank/account/
http://0.0.0.0:8080/account/bank/account/

I created a simple health page on zuul. to see if I can connect to zuul

This url works, when its run from springboot

http://localhost:8080/gateway/health/

But neither works from docker

http://localhost:8080/gateway/health/
http://0.0.0.0:8080/gateway/health/

I thought publishing 8080 to my local host, would mean I could use localhost

Answer 1

A few suggestions to debug the issue:

1. Put all services in one docker compose file and make sure they are on the same network

2. For defaultZone, change ip to eureka docker image name so instead of:

   defaultZone: http://172.21.0.2:8761/eureka

Try:

defaultZone: http://eureka-service:8761/eureka/

3. I'd try without preferIpAddress: true If you don't have multiple replicas of your registered services

4. After Exposing zuul gateway port, check what routes are available at localhost:8080/routes

Answer 2

The code does work. I found out that because I was developing my code in increments. I thought I was rebuilding a new image. I was not, I removed the images, rebuilt and the code works.