Spring-cloud-netflix: Inconsistent registration IP in Eureka using docker swarm.

[kimjuny]

I have docker service create a bunch of Eureka clients, but their IP type is inconsistent, sometimes it's containerId and sometimes it's numeric IP address.

And the numeric IP address - I don't really know where they are from - doesn't belong to my public or private IP address. I suppose numeric address comes from overlay network or docker inside.

Has anyone encountered the same problem like me?

Here are my eureka client config snippets.

eureka:
  client:
    serviceUrl:
      defaultZone: ${EUREKA_SERVER_ADDRESS}

spring:
  application:
    name: api
  redis:
    host: ${server.remote}
    port: 6379
  boot:
    admin:
      url: ${ADMIN_ADDRESS}
      username: ${security.admin.name}
      password: ${security.admin.password}
      client:
        metadata:
          user:
            name: ${security.admin.name}
            password: ${security.admin.password}

Supplement

I used docker stack deploy to deploy my Eureka server (2 instance aware of each other).

I used docker service create to deploy my Eureka client (STOCK-SERVICE) and feign consumer (API).

All of my instances (server、client、consumer) are all under same overlay network.

[andrehueppe]

Hi @kimjuny,

have you tried this?

eureka:
  instance:
    preferIpAddress: true

This sets the IP as hostname which is, at leased from what I've had learned, a good idea in docker environments.

[kimjuny]

@doernbrackandre Hi, I've just tried setting preferIpAddress: true, still no luck. I have added some supplement to my question.

[kimjuny]

Check this out, this fixes my problem.

spring:
  cloud:
    inetutils:
      ignored-interfaces:
        - eth0
        - eth1
        - eth2
        - eth3
        - lo

Set this to my service-provider and service-consumer configurations, and now they are all using IP address consistently rather than container-id. 🎉🎉

So I'm closing this.

[arpitx165]

Hi @kimjuny Still I am facing the same issue
Eureka Server Configuration look like :

spring.application.name=test-eureka-naming-server
server.port=8001
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.server.enableSelfPreservation=false
eureka.server.eviction-interval-timer-in-ms=1000

Client Configuration

spring.application.name=test-cloud-config-server
server.port=8003
eureka.client.service-url.defaultZone =http://172.17.0.2:8001/eureka
spring.profiles=docker
eureka.instance.prefer-ip-address=true

I put below config in client and server both

spring:
cloud:
inetutils:
ignored-interfaces:
- eth0
- eth1
- eth2
- eth3
- lo

Can you check? There is an issue in configuration or not?

[binakot]

@kimjuny Hello.
Check this issue https://github.com/spring-cloud/spring-cloud-netflix/issues/1820.
May be it will help to you. I wrote a lot there 😃.

[dhanvi]

I was making sure that we will always get container-id using this https://stackoverflow.com/a/45233417/3514300

[dhanvi]

2084

[dhanvi]

@kimjuny your configuration might fail if the docker container has more than 4 networks for example eth4 or eth5.

One way of making sure that you always get the hostname is by setting eureka.instance.hostname.

Refer: https://github.com/spring-cloud/spring-cloud-netflix/blob/master/docs/src/main/asciidoc/spring-cloud-netflix.adoc#prefer-ip-address