RagLeap Docs"could not translate host name 'db'" error after a failed docker compose up:
If your first docker compose up attempt fails (e.g. a port conflict on 5433 or 8000), a retry can sometimes leave the database container attached to a stale, orphaned Docker network. Fix:
docker compose down docker network prune -f docker compose up --build -d
Port 5433 or 8000 already in use:
Another instance of this project (or something else) is using the port. Either stop it, or change the host-side port mapping in docker-compose.yml (the "5433:5432" and "8000:8000" lines) to something free.