Coolify: The Open-Source Self-Hosted PaaS
Coolify is an open-source, self-hosted Platform as a Service (PaaS) that brings the developer experience of Vercel, Heroku, and Netlify to your own hardware, VPS, or cloud instances. Instead of paying hefty…
Lesson 24 of 26 · Module: Coolify
15 min read · Source notes — Connect Additional Servers to Coolify
Coolify is an open-source, self-hosted Platform as a Service (PaaS) that brings the developer experience of Vercel, Heroku, and Netlify to your own hardware, VPS, or cloud instances. Instead of paying hefty SaaS premiums, you retain 100% control over your data, compute costs, and deployments.
Instructor introducing the Coolify management dashboard and multi-server architecture.
1. Why Self-Host with Coolify?
| Capability | Commercial PaaS (Heroku / Render) | Coolify Self-Hosted |
|---|---|---|
| Cost | $25 - $200+ per service/month with strict RAM caps | $5 - $20/mo for a Hetzner / DigitalOcean VPS with 8GB RAM |
| Vendor Lock-in | Proprietary configuration files and buildpacks | Standard Dockerfiles, Docker Compose, or Nixpacks |
| Databases | Expensive managed add-on tiers with connection limits | 1-click PostgreSQL, Redis, MySQL, MongoDB with S3 backups |
| SSL Certificates | Automated (sometimes paywalled on custom domains) | Free automated Let's Encrypt certificates via Traefik |
2. Under the Hood: How Coolify Works
Coolify Control Plane Server (Dashboard UI, Git Webhook Listeners, Database State)
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Secure SSH Key Tunnel (Port 22)
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Target Worker Server Node (Docker Daemon, Traefik Reverse Proxy, User Containers)Keep going: ← Lesson 23 · Lesson 25 → · Module overview · Track it in the Self Guide
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Part of Self Guide · Stage 8: Self-hosting with Coolify. Progress is saved in this browser.
