Theo's Typesafe Cult•2y ago

Override ENV variables inside Docker Compose

Hey, I have those ENV variables for my docker compose config. There's one problem, inside docker I have to specific DB_HOST {container_name}, so I've tried to override it.

DB_HOST=localhost
DB_USER=
DB_PASSWORD=
DB_NAME=
DB_PORT=

DATABASE_URL=mysql://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}

DB_HOST=localhost
DB_USER=
DB_PASSWORD=
DB_NAME=
DB_PORT=

DATABASE_URL=mysql://${DB_USER}:${DB_PASSWORD}@${DB_HOST}:${DB_PORT}/${DB_NAME}

env_file:
  - .env
environment:
  DB_HOST: mysql # Rewrite the `localhost` host, but this won't override the `DATABASE_URL` ENV

env_file:
  - .env
environment:
  DB_HOST: mysql # Rewrite the `localhost` host, but this won't override the `DATABASE_URL` ENV

1 Reply

venusOP•2y ago

When I try to log the ENV vars using - command: env, then the ENV var change won't get affected

DATABASE_URL=mysql://<user>:<pw>@mysql:<port>/<db>
DB_NAME=
SERVER_URL=
DB_PASSWORD=
DB_HOST=
DB_USER=

DATABASE_URL=mysql://<user>:<pw>@mysql:<port>/<db>
DB_NAME=
SERVER_URL=
DB_PASSWORD=
DB_HOST=
DB_USER=

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Override ENV variables inside Docker Compose