Compose-Examples/examples/unify-network-application
..
README.md
docker-compose.yml
init-mongo.js

README.md

References

Notes

Note that you are mounting a file named init-mongo.js into the mongo db container. This file is necessary to initialize the mongo database (see https://hub.docker.com/_/mongo/ at "Initializing a fresh instance").

It basically defines the database name and user credentials for the unifi-network-application container.

These parameters are also referenced in the docker-compose.yml file. So either leave as is or adjust everywhere accordingly.