How to point a dependency to another container in docker-compose?

Question

Docker

Hello.

Hence the question is this. Example.
I have docker-compose with a database. I run it through one docker-compose file.
There is a second docker-compose file, where I must specify the dependency on this container with the base, and so that the second application can access it.
Please give an example. Thank you.

Answer 1

Common practice #1 is one docker-compose.yml and depends_on in the service config
Common practice #2 is many docker-compose.yml where services are federated via an external network (network: external). At the same time, the restart:always configuration is set for the service of the main application, so that it restarts until it sees the database.