Springboot client unable register with Eureka using Docker container id

In docker the container-id will be set as the hostname of the container by default. Containers can talk with each other using container-id (or here hostname)

So this issue can be solved by preferring hostname instead of ip.

But only way of making sure that registration happens through hostname is by setting eureka.instance.hostname reference

In docker you can set the container-id at run-time from the hostname by using the entry point as shell script (for example start.sh) and the script should be something similar to

#!/bin/shexport HOST_NAME=`hostname`java -Djava.security.egd=file:/dev/./urandom -Xmx1024m -jar /app.jar

and make sure you add eureka.instance.hostname=${HOST_NAME} in your application.yml

or you can reuse the HOSTNAME variable which is set by default in Docker and configuration becomes eureka.instance.hostname=${HOSTNAME}

I have added the same info in documentation

Update: looks like this can also be fixed by using endpoint_mode: dnsrr in the compose file (have to confirm). Refer this

Try setting eureka.instance.hostname in your client config.

I know this is an old question but this answer might be helpful to someone. After trying out a number of solutions, I noticed that a hostname environment variable(HOSTNAME) already exists in Ubuntu. My docker containers use the openjdk:8-jdk-alpine base. If you're using an Ubuntu base you can simply solve this issue by adding the following parameters to the properties files of all your eureka clients:

eureka.instance.hostname=${HOSTNAME}spring.cloud.client.hostname=${HOSTNAME}

The app will pick up the container's hostname which is the container id and pass that to the eureka server.