ERROR: for nginx Cannot create container for service nginx, You have to remove (or rename) that container to be able to reuse that name. ERROR: Encountered errors while bringing up the project. code example

Example: docker compose Conflict. The container name

Your case is probably related to a bug that will be fixed in the 18.03 release. Some workarounds are proposed here:

https://github.com/docker/for-linux/issues/211
https://github.com/moby/moby/issues/36145
docker-compose up builds, (re)creates, starts, and attaches to containers for a service.

Since your images are built and the containers of your service have started, you can then use

docker-compose stop and
docker-compose start
to start/stop your service. This is different from docker-compose down which:

Stops containers and removes containers, networks, volumes, and images created by up.

Regarding the danger of losing your data if a container is removed, read about persistent storage and how to use volumes.

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Misc Example