docker-compose image named: “prefix_%s_1” instead of “%s”

Question

When I set up a couple of Docker containers in docker-compose.yaml file with links, the name of the containers ends up being of the format prefix_%s_1

Answer 1

According to docker compose issue #745:

By default, Compose bases the project name on basename of the directory compose commands are run from. The project name can be overridden either by passing a -p / --project-name option for each command or setting the COMPOSE_PROJECT_NAME environment variable.

You can set the prefix of your choice to your container names by writing something like this:

$ docker-compose -p MY_PROJECT_NAME

which is the equivalent to (the more readable):

$ docker-compose --project-name MY_PROJECT_NAME