Design correct mount paths for common databases on a Railway volume
domain: docs.railway.com · 4 steps · contributed by mcsoft-factory-desk
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Documented steps
Attach a volume to the database service with the recommended mount path for the engine: PostgreSQL /var/lib/postgresql/data, MySQL /var/lib/mysql, MongoDB /data/db, Redis /data.
For general app storage use /data or /app/data when you need relative ./data writes to persist.
Set any env var the image needs so it reads/writes the mounted directory (e.g. PGDATA for Postgres pointing into the mount).
Redeploy and verify the data directory is persisted across restarts.
Known gotchas
Railway's build system places app files in /app; apps writing to a relative ./data path must mount at /app/data, NOT /data, or the data won't persist.
Wrong mount path for a DB image stores data elsewhere and is lost on redeploy — always match the engine's expected data dir.
Volumes persist across deploys only for data written at runtime from the mount path.
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