Deploy and Host KeyDB on Railway

KeyDB is a multi-threaded, Redis-compatible in-memory datastore. It speaks the Redis protocol, so existing clients, queues, rate limiters and caches connect to it unchanged, while serving them from several threads instead of one.

This template runs KeyDB 6.3 as a single service from a digest-pinned official image: the Redis port on a Railway TCP proxy, and a Railway volume holding an append-only file and snapshots.

About Hosting KeyDB

Threads follow your plan. KeyDB defaults to a handful of threads regardless of the container. The start command reads the container's CPU quota and starts that many server threads, capped at four, and prints the number it chose in the deploy log.
Memory is capped below the limit. maxmemory is set to 70% of the container's memory limit with noeviction, so a full instance returns errors instead of being killed by the platform.
Writes survive restarts. Append-only persistence (everysec) is on, with the data on the Railway volume at /data; a redeploy or a crash loses at most about a second of writes.
A password is required from the first connection. It is generated per deploy; anonymous clients are rejected.
Two ways in. Services in the same project use the private URL; clients elsewhere use the TCP proxy URL. Both IPv4 and IPv6 are listened on, so the private network works.

Common Use Cases

A drop-in replacement for Redis as a cache or session store
Job queues (BullMQ, Sidekiq, Celery) and rate limiters on the Redis protocol
Leaderboards, counters and real-time state shared between services
Workloads that outgrow a single-threaded Redis on one container

Dependencies for KeyDB Hosting

One Railway volume for the append-only file and snapshots (created by the template)

Deployment Dependencies

KeyDB documentation: https://docs.keydb.dev
Official image: https://hub.docker.com/r/eqalpha/keydb

Implementation Details

Variable	Purpose
`KEYDB_PASSWORD`	Password for connections, generated per deploy.
`KEYDB_URL`	`redis://` URL on the private network, for services in the same project.
`KEYDB_PUBLIC_URL`	`redis://` URL on the TCP proxy, for clients outside Railway.

Python:

import redis
r = redis.from_url("")
r.set("hello", "world")

Why Deploy KeyDB 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 KeyDB 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.