Telegram and WhatsApp are convenient, but they don't give control over data. Your own messenger on a virtual server means privacy, customization, and independence. Let's figure out how it works and where to start.
Why Set Up Your Own Messenger
At first glance, it seems: there are Telegram, Slack, Signal — why reinvent the wheel? But there are scenarios where commercial messengers are fundamentally unsuitable.
Corporate communications go to someone else's servers. GDPR require storing data in specific jurisdictions. Startups don't want to pay $8 per user in Slack for a team of 200 people. Developers want to embed chat directly into their application with the right API.
Your own messenger on VPS solves all this at once: data is stored where you decide, the interface looks as you need, and costs scale linearly with load, not with the number of users.
What a Messenger Consists Of
Before choosing a platform, it's useful to understand what exactly you're setting up. Any modern messenger consists of several layers.
- Server part (backend) — handles authorization, stores messages and files, manages channels and users.
- Real-time protocol — WebSocket or long-polling for instant message delivery without page reload.
- Client applications — web interface, mobile and desktop applications. Most open-source solutions come with ready-made clients.
- Storage — database for messages (PostgreSQL, MongoDB) and object storage for media files (S3-compatible).
- Transport — HTTPS/WSS, reverse proxy (nginx), SSL certificate.
Good news: mature open-source projects have already packaged all this into Docker Compose or a single installer. You don't need to assemble these layers manually — you just need to configure and deploy them correctly.
Platform Choice: Top 6 Solutions
The self-hosted messengers market in 2026 has dozens of projects. We've selected six most viable ones — considering community activity, ease of installation, and real production use.
| Platform | Best for | Protocol | Mobile Clients | Min. RAM | License |
|---|---|---|---|---|---|
| Rocket.Chat | Teams, corporations | WebSocket | iOS + Android | 2 GB | MIT / EE |
| Matrix / Element | Federation, privacy | Matrix | iOS + Android | 1 GB | Apache 2.0 |
| Mattermost | DevOps teams, Slack replacement | WebSocket | iOS + Android | 1 GB | MIT / EE |
| Zulip | Asynchronous discussions | WebSocket | iOS + Android | 2 GB | Apache 2.0 |
| XMPP (Prosody) | Maximum customization | XMPP | Third-party clients | 512 MB | MIT |
| Jami | P2P, no central server | DHT / SIP | iOS + Android | — | GPL 3.0 |
Rocket.Chat — the most functional out of the box: video calls, bots, app marketplace, SSO. Requires more resources, but feels like a full Slack alternative.
Matrix/Element — unique federated architecture: your server can exchange messages with other Matrix servers, like email. Ideal if decentralization matters.
Mattermost — minimalist and fast. Integrates excellently with GitLab, Jenkins, Jira. Favorite choice for DevOps teams.
Server Requirements
VPS choice depends on the number of concurrent users and storage load. Follow these figures.
- Up to 50 users: 2 vCPU, 2–4 GB RAM, 40 GB SSD. Most basic plans will do.
- 50–500 users: 4 vCPU, 8 GB RAM, 100 GB SSD. Dedicated disk for media files or S3 recommended.
- 500+ users: Horizontal scaling, load balancer, dedicated DB.
For media files (images, videos, documents), it's best to connect S3-compatible object storage right away — this unloads the VPS disk and simplifies backups.
The simplest way is to choose a cloud platform from our list — for example, VPS-server for backend hosting.
Step-by-Step Installation: Mattermost on Ubuntu 24.04
Let's break down the full process using Mattermost — one of the simplest solutions to install.
1. Server Preparation
Update the system and install Docker:
2. Domain and SSL Setup
Point your domain's A record to the server IP. Install Certbot and get a certificate:
3. Launch via Docker Compose
Download the official
from the Mattermost repository, set environment variables (domain, DB password, Site URL), and launch:
In 1–2 minutes, the messenger will be available at your domain. The first user to register becomes admin automatically.
4. Nginx as Reverse Proxy Setup
Create nginx config to proxy requests to Mattermost port (usually 8065) with mandatory WebSocket support:
5. Backup
Set up automatic PostgreSQL dumps and media file sync. Minimum frequency — daily, for production — hourly.
Security: What to Configure Before Launch
A messenger with employee chats is a juicy target for attackers. Basic security checklist before production:
- Block direct access to app ports (8065, 27017, 5432) via firewall — localhost only.
- Enable two-factor authentication for admins.
- Set up fail2ban to protect against SSH and web interface brute-force.
- Use a complex DB password and don't store it in plain text.
- Set up automatic SSL certificate renewal via cron or systemd timer.
- Enable disk encryption at provider level or via LUKS.
Don't use self-signed certificates in production — Matrix and Mattermost mobile clients refuse to connect to servers without valid TLS by default.
Typical Deployment Errors
Error 1: Skimping on RAM
Problem: Rocket.Chat and Zulip consume 1.5–2 GB on Node.js and MongoDB processes alone at startup. VPS with 1 GB RAM will swap on first connections.
Solution: Get a server with memory to spare. Minimum 2 GB for testing, 4 GB+ for production.
Error 2: Forgotten WebSocket
Problem: Without proper WebSocket proxying, users get messages only on page refresh.
Solution: Check
and
headers in nginx config — they are mandatory for real-time.
Error 3: Media Files on System Disk
Problem: After half a year of active use, the attachments folder can take hundreds of GB and fill the system partition.
Solution: Set up media storage in S3 or on a separate mounted volume from the start.
Error 4: No Monitoring
Problem: Server downtime at night won't be noticed until morning — users just can't send messages.
Solution: Connect uptime monitor (Uptime Kuma, Betterstack) and set up alerts at least in Telegram.
Pros and Cons of Self-Hosted Messenger
Advantages
- Full data control. Chats stored only on your server — no foreign clouds.
- Regulatory compliance. Data in the jurisdiction you choose.
- Predictable costs. Pay for server, not per user — much cheaper at scale.
- Customization. Branding, integrations, API — all tailored to your processes.
- Vendor independence. No sudden tariff changes, blocks, or service shutdowns.
Limitations and Risks
- Infrastructure responsibility. Backups, updates, security — all on you.
- Requires technical knowledge. Setup and maintenance harder than SaaS subscription.
- Implementation time. Deploying a ready messenger takes hours, not minutes.
- Load at high traffic. Need to scale server quickly with user growth.
FAQ: Frequently Asked Questions
Can you set up a messenger on the cheapest VPS?
For testing and small team up to 10 people — yes. For production with 50+ users, need at least 4 GB RAM. Skimping on server will backfire on first load.
Are there ready mobile apps?
Rocket.Chat, Mattermost, Matrix/Element, and Zulip have official apps in App Store and Google Play. Users connect to your server by just entering its URL.
How to migrate from Slack or Telegram?
Mattermost offers official tool to import Slack history. For Telegram, there are third-party scripts using Telegram API. Matrix chat history doesn't transfer between servers — only new messages.
How hard is server updates?
With Docker install, just update image tag in
and restart container. Always backup DB before update.
What if video calls are needed?
Rocket.Chat includes Jitsi integration out of the box. Mattermost supports Zoom plugins and own WebRTC calls in Enterprise. For Matrix, set up separate Jitsi server or Element Call.