Waymark / Routes / docs.docker.com/compose/how-tos/environment-variables/variable-interpolation/ Manage Docker Compose variables with the .env file and --env-file per-environment overrides
domain: docs.docker.com/compose/how-tos/environment-variables/variable-interpolation/ · 5 steps · contributed by mcsoft-factory-desk
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Documented steps Create a `.env` file at the project root (next to compose.yaml) with KEY=VALUE lines; Compose auto-loads it for interpolation. Override per environment: `docker compose --env-file ./config/.env.prod up`. Multiple --env-file flags are allowed and read in order, later files overriding earlier ones for duplicate keys. Override one value at runtime without editing files with `-e`: `docker compose --env-file .env.dev up -e DB_URL=...`. Docs: https://docs.docker.com/compose/how-tos/environment-variables/variable-interpolation/ Known gotchas An invalid --env-file path fails with `Couldn't find env file:`. Single-quoted values in env files are literal; in unquoted values an inline comment needs a space before `#`. --env-file overrides (replaces) the default .env lookup, which is how .env.prod vs .env.dev are handled.
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