Dokku is a Docker-powered, open-source mini-Heroku that provides the smallest PaaS implementation for deploying applications on a single server. It accepts Heroku-compatible applications via Git push, builds them using Heroku buildpacks or Dockerfiles, and runs them in isolated containers with automatic SSL certificates, domain management, and process scaling. Dokku replicates the core Heroku workflow on your own hardware, making it an extremely cost-effective deployment solution.
The platform features a modular plugin system that extends its functionality with databases like PostgreSQL, MySQL, MongoDB, and Redis, along with Let's Encrypt SSL automation, cron job scheduling, and log management. Dokku handles containerization, nginx-based load balancing, and zero-downtime deployments automatically. Its Git-based deployment workflow is familiar to anyone who has used Heroku, requiring only a simple git push command to deploy or update an application.
Dokku is best suited for individual developers, small teams, and hobbyists who want a Heroku-like experience on a single VPS without recurring platform costs. It supports any language or framework that can run via Heroku buildpacks or Docker, making it extremely versatile. The main limitation is that Dokku is designed as a single-host solution with no built-in support for multi-server clustering, so teams needing horizontal scaling across multiple machines should consider alternatives like Coolify or Kubernetes.