Register to Eureka from Docker with a custom IP

Question

I'm running Spring Cloud Eureka inside my Docker VM. I have services registering to it, but they use their IP adress from inside the Docker VM, but to be able to use them properly i need them to use the IP adress i can access from outside the VM.

For example inside my VM the register using 172.x.x.x and i can access the REST interface from my browser using 192.168.x.x.x. I need them to register as 192.168.x.x.x.

How can i tell my service to register with a specific IP adress?

Answer 1

You can configure it in your application.yml:

eureka:
    instance:
        ipAddress: 192.168.x.x

Answer 2

Both previous answers are correct, but I'll make copy-pasting easier.

What you should do is add an environment variable with the host ip when starting your container and in your Spring Boot application.yml file include it.

application.yml

eureka:
  instance:
    # Necessary for Docker as it doesn't have DNS entries
    prefer-ip-address: true
    # Necessary for Docker otherwise you will get 127.0.0.x ip
    ip-address: "${HOST}"
  client:
    serviceUrl:
      # Location of your eureka server
      defaultZone: http://192.168.0.107:8761/eureka/

Running with Docker

docker run -p <port>:<port> -e HOST='192.168.0.106' <image name>

Running with docker-compose

my_service:
  image: image_name
  environment:
    - HOST=192.168.0.106
  ports:
    - your_port:container_port

Answer 3

You can use environment variables in the eureka configuration in application.yml

In the following example I am using the $HOST and $PORT environment variables to tell the eureka client what values to use. In my case, these variables are set by Mesos/Marathon. You may find other useful variables set by Docker.

The following works for me:

eureka:
  client:
    serviceUrl:
       defaultZone: http://discovery.marathon.mesos:31444/eureka/
    registerWithEureka: true
    fetchRegistry: true
  instance:
    appname: configserver
    health-check-url: /health
    prefer-ip-address: true
    ip-address: "${HOST}" # mesos/marathon populates this in the environment
    non-secure-port: "${PORT}" # mesos/marathon populates this in the environment

Answer 4

Register to Eureka with a custom IP and a custom PORT:

server:
  port: 18090
eureka:
  instance:
    prefer-ip-address: true
    ip-address: 10.150.160.21
    non-secure-port: 8080

I run into a situation where 10.150.160.21:8080 is mapped to 192.168.1.124:18090 over a firewall. The application is running on 192.168.1.124:18090 but have to register to Eureka with 10.150.160.21:8080.

It works for me.