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Pipelines: How to connect to a (Postgres) service from within another Docker container

In my pipelines I have defined an external service that runs Postgres:

      image: postgres
        POSTGRES_USER: 'myuser'
        POSTGRES_PASSWORD: 'mypassword'

Now, in my pipeline I need to build my web app from a custom Dockerfile and then test it with the DB. So I define my pipeline step as follows:

- step:
- docker build -t app .
- docker run app ./
- services:
- db
- docker

I can see that Postgres is listening on port 5432 on the main host (executor), but I can't seem to find a way to connect to it from within my app Docker container.

I also tried to run it with `--network="host"` but this doesn't work due to restrictions in place.

Any ideas? In GitLab this works perfectly. Thanks.

1 answer

0 votes

Hi Jozef,

Try adding a host-to-IP mapping in your "docker run" command, like this:

docker run --add-host host.docker.internal:$BITBUCKET_DOCKER_HOST_INTERNAL app ./

Then you should be able to connect to the service using host.docker.internal:5432 within the container.

The following blog post explains why this is now needed:

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