How link a Spring boot app at existing docker container for database? - postgresql

Question

I want to use my app from a docker container with anothers docker container, one for postgres and one for solr.
My docker compose is:
version: '3'
services:
core:
build: ./core
ports:
- "8081:8081"
environment:
- "SPRING_PROFILES_ACTIVE=production"
links:
- postgresdb
- solrdb
postgresdb:
image: postgres:9.4
container_name: postgres
ports:
- "5432:5432"
environment:
- DB_DRIVER=org.postgresql.Driver
- DB_URL=jdbc:postgresql://localhost:5432/db
- DB_USERNAME=db
- DB_PASSWORD=db
networks:
default:
solrdb:
image: solr:5.5
container_name: solr
ports:
- "8983:8983"
environment:
- DB_URL=http://localhost:8984/solr
networks:
default:
networks:
default:
external:
name: mynet
And already I have containers for solr and postgres created, just I want to use it. How I can do it?

Answer 1

You have already exposed the ports for solrdb and the postgresdb. So in your other container access these Dbs by the container names and the exposed port.
For example, solrDb should be accessed via solrdb:8983 and
the postgresdb should be accessed via postgresdb:5432
Edit :
Make sure that both the containers are operating in the same network. You need to add this network field for all the containers.
postgresdb:
image: postgres:9.4
container_name: postgresdb
ports:
- "5432:5432"
environment:
- DB_DRIVER=org.postgresql.Driver
- DB_URL=jdbc:postgresql://localhost:5432/db
- DB_USERNAME=db
- DB_PASSWORD=db
networks:
default:
and in the end of all the docker file
networks:
default:
external:
name: <your-network-name>
And make sure that your predefined network is running prior to the start of these containers.
To create the network :
docker network create --driver overlay --scope global <your-network-name>
Note : Your container ('postgresdb') will be accessible by postgresdb:5432