---
title: "Deploy 🚀 MongoDB 8.2.3 Replica"
description: "🚀 Deploy and Host MongoDB 8.2.3 Replica [PRIMARY, SECONDARY, ARBITER]"
category: "Storage"
url: https://railway.com/deploy/mongodb-823-replica
---

# Deploy 🚀 MongoDB 8.2.3 Replica

🚀 Deploy and Host MongoDB 8.2.3 Replica [PRIMARY, SECONDARY, ARBITER]

**[Deploy 🚀 MongoDB 8.2.3 Replica on Railway](https://railway.com/template/mongodb-823-replica)**

- **Creator:** iCue
- **Category:** Storage
- **Total deploys:** 7

## Template content

### mongo-primary https://devicons.railway.app/mongo

- **Source:** icueth/railway-mongodb-3node

### mongo-arbiter https://devicons.railway.app/mongo

- **Source:** icueth/railway-mongodb-3node

### init https://devicons.railway.app/>_

- **Source:** icueth/railway-mongodb-3node

### mongo-secondary https://devicons.railway.app/mongo

- **Source:** icueth/railway-mongodb-3node

## Documentation

# Deploy and Host MongoDB 8.2.3 Replica on Railway

MongoDB 8.2.3 Replica Set is a robust high-availability NoSQL database architecture. This template deploys a production-ready PSA (Primary-Secondary-Arbiter) configuration, ensuring data redundancy, automatic failover, and read scalability. It comes pre-configured with secure keyfile authentication and internal networking support, making it ready for mission-critical applications.

## About Hosting MongoDB 8.2.3 Replica

Hosting this replica set involves deploying three interconnected service nodes within Railway's private network: a **Primary** node for write operations, a **Secondary** node for data redundancy and read scaling, and a lightweight **Arbiter** node to participate in elections without storage overhead.

The template includes an ephemeral initialization service that automatically configures the replica set members once they are online. This eliminates the complexity of manual CLI configuration. Persistence is handled via Railway volumes attached to the data-bearing nodes, ensuring data safety across deployments. Security is enforced using strict keyfile-based internal authentication.

## Common Use Cases

- **High-Availability Applications**: Ensure zero downtime for mission-critical web and mobile backends with automatic failover capabilities.
- **Microservices Architecture**: Serve as a reliable, scalable centralized data store for distributed microservices.
- **Read-Heavy Workloads**: Offload read operations to the Secondary node to improve performance for analytics or reporting dashboards.

## Dependencies for MongoDB 8.2.3 Replica Hosting

- MongoDB 8.2.3 Official Docker Image
- Railway Private Networking (IPv6)

### Deployment Dependencies

- [MongoDB Replication Documentation](https://www.mongodb.com/docs/manual/replication/)
- [Railway Volumes Documentation](https://docs.railway.app/deploy/volumes)

### Implementation Details

This template uses a **PSA (Primary-Secondary-Arbiter)** architecture:
- **Primary**: Variable priority, votes, stores data.
- **Secondary**: Variable priority, votes, stores data.
- **Arbiter**: No data storage, participates in elections only (Cost-effective).

**Authentication**:
Nodes authenticate with each other using a shared `KEYFILE` environment variable. You must generate a Base64 keyfile string and set it across all nodes during deployment for security.

## How to Configure

When deploying the template, ensure you provide the following variables for the **Primary** service (which will be shared to others):

1. **Keyfile**: Provide a secure Base64 string in `KEYFILE`.
2. **Username**: Set your admin username in `MONGO_INITDB_ROOT_USERNAME`.
3. **Password**: Set your secure password in `MONGO_INITDB_ROOT_PASSWORD`.

## External Connectivity

To connect to your database from an external client (setup after deployment):

1. Go to the **Primary** service settings.
2. Navigate to **Networking** > **Public Networking**.
3. Click to create a **TCP Proxy** domain (Port 27017).
4. Connect using the generated address with **Direct Connection** mode:
   `mongodb://user:pass@proxy-domain:port/?directConnection=true&authSource=admin`

## Why Deploy MongoDB 8.2.3 Replica 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 8.2.3 Replica 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.

## Support This Project

If this template saves you time and money, consider supporting its development! ☕

[![Support Me](https://img.shields.io/badge/Support%20Me-Stripe-blue?style=for-the-badge&logo=stripe)](https://buy.stripe.com/14A28sbLa5mJ8SM5qY2VG01)

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