I am using the fabric8 docker-maven-plugin to build image for my Spring boot microservices.
<groupId>io.fabric8</groupId>
<artifactId>docker-maven-plugin</artifactId>
The problem is that while running the application in docker containers I have to specify the Eureka Server Container name to Eureka Client. But if I run it directly as a "Spring Boot APP" I have to use "Localhost:8761/Eureka". Is there a way to make it work both with/without docker something like given below ?
eureka:
client:
service-url:
defaultZone: ${EUREKA_SERVER:http://localhost:8761/eureka}
I am not able to pass the value of "EUREKA_SERVER" from the fabrib8 plugin. I have tried the below code to pass the value but it does not work.
<docker.env.JAVA_OPTS>-DEUREKA_SERVER=http://discovery:8761/eureka</docker.env.JAVA_OPTS>
Spring can pickup Environment Variables. So if you add Environment Variables to the Docker Container that Spring Boot is running in, they will work. This avoids the need to provide a static URL up front.
If you use Docker Compose, it could look like this:
services:
eureka:
image: springcloud/eureka
container_name: eureka
ports:
- "8761:8761"
networks:
- "discovery"
environment:
- EUREKA_INSTANCE_PREFERIPADDRESS=true
spring:
build:
context: .
dockerfile: ./src/main/docker/Dockerfile
depends_on:
- eureka
container_name: spring
ports:
- "8080:8080"
networks:
- "discovery"
environment:
- EUREKA_SERVICE_URL=http://eureka:8761 // This overrides your Spring Property
- EUREKA_INSTANCE_PREFER_IP_ADDRESS=true
- LOGGING_FILE=/tmp/admin.log
Note: Since Environment Variables are not YAML, you need to change the format a bit. https://docs.spring.io/spring-boot/docs/1.5.5.RELEASE/reference/html/boot-features-external-config.html#boot-features-external-config-relaxed-binding