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Minimal single-region architecture for a Scalingo web app using a managed PostgreSQL add-on over private networking, with requirements, trust boundaries, ops checks and failure modes.
When deploying services on Railway, you must decide how they reach databases and other services. This guide compares private internal DNS, public TCP proxies, and reference variables, showing trade‑offs and a quick validation checklist.
Railway services in the same project can talk over a private network using internal DNS names. Here's how to wire an app-plus-database setup, why you should disable the database's public proxy, and how to verify it all works.
Wire a Node/Express API to Railway Postgres using only internal DNS—no public database endpoint, no egress charges, and a stable hostname that survives redeploys.
Railway's private networking lets services in the same project talk over an internal network. Here's how to wire an app to Postgres without ever exposing the database publicly.
Move service-to-service calls off the public internet in Railway using .railway.internal DNS and reference variables, with environment-scoped isolation and a private Postgres example.
Stop exposing your databases to the public internet. Learn how to use Railway's private networking to secure internal service communication and reduce latency.
Stop exposing internal APIs to the public web. Learn how to use Railway private networking to secure inter‑service communication and reduce latency.
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