brApi | A GeoJSON API built for brApp

The problem is in your application.properties file. The datasource url is pointing to host.docker.internal. This should only be used when connecting something from inside a docker container to something running outside docker on the host machine (documentation). You need a different solution because your Spring server and Postgres server are both running inside docker containers.

You need a Docker Network, specifically a bridge network, to connect your different containers. Docker Bridge Networks

Try something like this

1. Run this command to create a network in docker called “brapi_net”
   $> docker network create --driver bridge network_name

2. Run the postgres container and link it to the network. Create your database schema as normal.
   $> docker run --name PostgresServer --network=network_name --e POSTGRES_PASSWORD=*** -d Postgres
$> sudo docker exec -it PostgresServer psql -U postgres
$> CREATE DATABASE aa;

3. With a Docker network, container names act as server names. Modify your application.properties to reflect this
   spring.datasource.url=jdbc:postgresql://PostgresServer:5432/aa

4. Run the server container and link it to the network.
   $> docker run -v /Users/juancesard.pineda/Desktop/brapi:/home/brapi/properties --network=network_name -d brapicoordinatorselby/brapi-java-server:v2