Tips: Docker

docker start/run/create

docker              run
       =  create  +  start  +  attach
       =  create  + (   start -a    )
       =  ( run --detach )  +  attach

docker compose up/start

docker compose              up
              = build + (up --no-start)  +  start
              = build +    create       +  start

docker compose  down
              = stop + rm [ + docker network rm ... ]

docker compose  down   -v
              = down + docker volume rm ...

ENTRYPOINT vs CMD

entrypoint is the "entry" base command. It is the "app" that the image represents. If it does not represent an app, it should be empty.

cmd is the default argument(s) to the entrypoint. If entrypoint does not exist, cmd gets executed. cmd can be overridden.

For example:

ENTRYPOINT ["python", "app.py"]
CMD ["default_arg1", "default_arg2"]

https://stackoverflow.com/a/34245657

Invoke docker without sudo

Invoke docker without adding sudo every time.

You still need root permission to configure this.

sudo usermod -aG docker $(whoami)
# Re-login

https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user

docker compose restart

Restart docker compose with updated images.

docker compose pull
docker compose up -d
docker compose logs -f

If there are existing containers for a service, and the service’s configuration or image was changed after the container’s creation, docker compose up picks up the changes by stopping and recreating the containers (preserving mounted volumes). To prevent Compose from picking up changes, use the --no-recreate flag.

https://docs.docker.com/engine/reference/commandline/compose_up/#description