2 months ago
I have a monorepo with multiple services. The apps/auth service is configured to use a Dockerfile, but Railway keeps using Railpack instead, causing build failures.
Configuration:
apps/auth/railway.jsonexplicitly sets"builder": "DOCKERFILE"and"dockerfilePath": "apps/auth/Dockerfile"- Root directory is set to
.(repo root) - UI also shows Dockerfile selected as the builder
Issue: Build logs show root_dir= (empty) and Railpack is being used instead of the Dockerfile. The config-as-code file is found but the builder setting is ignored.
Build logs show:
config-as-code path set as '/apps/auth/railway.json'
...
using build driver railpack-v0.18.0
Despite Dockerfile being explicitly configured, Railpack runs and fails because it can't find a start command in the monorepo root.
Timeline:
- Yesterday evening: Same exact configuration worked fine
- This morning: Same configuration now fails
- No changes made to config or code
Expected: Dockerfile build should be usedActual: Railpack is used, ignoring the builder configuration
3 Replies
2 months ago
same Q,
i try:
- Dashboard Builder setting: Dockerfile (confirmed, value set in
railway.toml)
- Tested with Metal Build Environment both ON and OFF — same result
- Manual Redeploy from dashboard: works correctly (uses Dockerfile)
- Git push triggered deploy: fails (ignores Dockerfile, uses
Railpack)
2 months ago
Experiencing the same. Manual redeploy from dashboard also worked for me (thanks for the tip!).
2 months ago
great, worked for me too
Status changed to Solved nico • 2 months ago