Deploy and Host MongoDB Atlas Local on Railway

MongoDB Atlas Local is the official MongoDB image that bundles the database with the Atlas Search engine (mongot). It gives you $search full-text queries and $vectorSearch similarity queries on your own Railway project, the same aggregation stages you would use on MongoDB Atlas. This template runs it as a single digest-pinned service, with the database port on a Railway TCP proxy and a Railway volume holding the data.

About Hosting MongoDB Atlas Local

Atlas Search and Vector Search work out of the box. Create a search index with createSearchIndex and query it with $search or $vectorSearch. Verified on a live deploy: a text index and a cosine vector index both reached READY and returned the expected documents.
Authentication is on from the first connection. A root user named admin is created at first boot with a password generated per deploy. Connections with a wrong password are refused.
Your data survives redeploys. The data, config and search directories live on a Railway volume mounted at /data. The server runs as root so the root-owned volume is writable, and the deploy log prints the user id and mount owner.
Two ways in. Services in the same project use the private URL; clients elsewhere use the TCP proxy URL. Both include directConnection=true, which this single-node replica set requires.

Common Use Cases

Building retrieval-augmented generation (RAG) apps with $vectorSearch on embeddings
Adding full-text search to a MongoDB application without running Elasticsearch
A staging database that behaves like MongoDB Atlas, for apps you will later move to Atlas
Prototyping hybrid search (text plus vector) from your laptop with a driver

Dependencies for MongoDB Atlas Local Hosting

One Railway volume for the data directory (created by the template)

Deployment Dependencies

Atlas Local documentation: https://www.mongodb.com/docs/atlas/cli/current/atlas-cli-deploy-local/
Official image: https://hub.docker.com/r/mongodb/mongodb-atlas-local

Implementation Details

Variable	Purpose
`MONGO_PASSWORD`	Password of the `admin` user, generated per deploy.
`MONGO_PRIVATE_URL`	Connection string on the private network, for services in the same project.
`MONGO_PUBLIC_URL`	Connection string on the TCP proxy, for clients outside Railway.

The image does not include mongosh; connect with mongosh "$MONGO_PUBLIC_URL" from your machine or with any driver, for example:

from pymongo import MongoClient
client = MongoClient(PUBLIC_URL)
client.test.docs.create_search_index({"name": "txt", "definition": {"mappings": {"dynamic": True}}})

Why Deploy MongoDB Atlas Local on Railway?

Railway is a singular platform to deploy your infrastructure stack. Railway will host your infrastructure so you don't have to deal with configuration, while allowing you to vertically and horizontally scale it.

By deploying MongoDB Atlas Local on Railway, you are one step closer to supporting a complete full-stack application with minimal burden. Host your servers, databases, AI agents, and more on Railway.