What is Dokku?
Dokku is an open-source Platform-as-a-Service (PaaS) that runs on a single server. It mimics Heroku's core functionality, letting you deploy apps via Git pushes, Docker containers, and buildpacks.
The project's tagline, "the smallest PaaS implementation you have ever seen," is accurate. Dokku is a self-hosted, minimal Heroku that runs on your own VPS or bare-metal machine. It handles deployment, environment management, database provisioning, and basic scaling from the command line.
Created by Jeff Lindsay, Dokku is now maintained by the community with contributions from Glider Labs and others. It is written in Shell and Go and relies on Docker for containerization and Heroku's buildpacks for runtime detection.
There is no corporate parent company behind Dokku. It remains community-driven and MIT-licensed, with support via GitHub issues, a forum, and a Discord server.
Who is Dokku best for?
Dokku suits solo developers, small teams, and hobbyists who want a Heroku-like workflow without Heroku's per-dyno pricing. It is also ideal for those who want full server control without managing Kubernetes or complex CI/CD pipelines.
Dokku bridges the gap between manual server management and a fully managed PaaS, offering a powerful yet straightforward middle ground.
- Solo developers deploying side projects or small SaaS apps with zero-cost hosting beyond the VPS.
- Small teams (2–5 people) needing a simple, repeatable deployment process for internal tools or client projects.
- Developers migrating from Heroku who want to keep their workflow but reduce costs.
- Hobbyists and learners who want to understand how a PaaS works under the hood.
- Anyone running a single-server architecture who does not need multi-region redundancy or auto-scaling.
Key features
Git-push deployment
Dokku uses a Git remote to deploy applications. After adding a Dokku remote, a simple git push dokku main triggers the entire pipeline: code transfer, Docker image build, and container start.
This is identical to Heroku's workflow, making migration trivial for anyone familiar with that platform.
Buildpack support
Dokku automatically detects your app's language using Heroku's official buildpacks. It supports Ruby, Python, Node.js, Go, Java, PHP, and many others out of the box.
You can also use custom buildpacks or a Dockerfile for more control. Buildpack detection is reliable for standard frameworks like Rails, Django, and Express.
Database and service provisioning
Through Dokku's plugin system, you can provision databases with a single command. For example, dokku postgres:create mydb creates a PostgreSQL container, and dokku postgres:link mydb myapp connects it, setting environment variables like DATABASE_URL automatically.
Supported services include PostgreSQL, MySQL, Redis, MongoDB, Elasticsearch, and more. This eliminates manual container orchestration for stateful services.
Let's Encrypt SSL certificates
Dokku includes a plugin for automatic SSL provisioning via Let's Encrypt. After setting a domain, running dokku letsencrypt myapp obtains and renews certificates automatically.
This works with the standard ACME protocol and requires no manual certificate management. Your domain must be pointed at the server's IP address beforehand.
Plugin ecosystem
Dokku's functionality is extended through a community-maintained plugin system. There are over 50 official and third-party plugins covering logging, monitoring, backups, deployment hooks, and more.
Plugins are installed via dokku plugin:install and can be updated individually. This modular approach keeps the core lightweight while allowing advanced users to add exactly what they need.
Dokku pricing
Dokku itself is completely free and open-source under the MIT license. There are no paid tiers, subscription fees, or usage limits imposed by the software.
The only cost is the server you run it on. A typical VPS from providers like DigitalOcean, Linode, or Hetzner costs $5–10 per month for a small application. You also pay for additional services like a domain name or object storage for backups.
| Cost factor | Dokku | Heroku (cheapest tier) |
|---|---|---|
| Software cost | Free (MIT license) | From $7/month per dyno |
| Server cost | $5–10/month VPS | Included in dyno price |
| Additional costs | Domain, backups, object storage | Database and add-on charges |
| Multiple apps | One VPS runs many apps | Each app and database billed separately |
Compared to Heroku, Dokku offers significant savings. A single $10 VPS can run multiple applications and databases, whereas on Heroku each incurs separate charges.
However, you must manage the server yourself: security updates, OS patches, and disk space monitoring are your responsibility. For developers comfortable with Linux administration, the value is excellent. For those who prefer a fully managed service, the savings may not justify the overhead.
Bottom line: Dokku is free software; you only pay for the VPS. A $10 server can replace multiple Heroku dynos and databases.
What users like
- Heroku-identical workflow: Deployment is identical to Heroku, making migration easy with minimal changes.
- Single-command databases: Provisioning removes the need to manually set up and connect Docker containers for backing services.
- Automatic SSL: Let's Encrypt integration works reliably with no manual certificate renewal.
- Modular plugins: The plugin system keeps the core minimal while allowing customization for logging, monitoring, and backups.
- Thorough documentation: Step-by-step guides cover installation on major Linux distributions.
What could be better
- No multi-tenant isolation: Dokku is designed for a single user or a trusted team sharing SSH access; there is no built-in user authentication.
- Limited scaling: Scaling is restricted to multiple containers on a single machine; no native clustering or load balancing across servers.
- Manual zero-downtime deploys: Rolling deployments and zero-downtime require manual configuration or third-party plugins; not enabled by default.
- Basic logging: Logs go to journald or files by default; no built-in aggregation or search interface.
Dokku verdict
Dokku is an excellent tool for developers who want a Heroku-like experience without the recurring costs. It is particularly well-suited for side projects, internal tools, and small production applications where a single server is sufficient.
The Git-push deployment, buildpack support, and one-command database provisioning make it one of the simplest self-hosted PaaS options available. It is reliable for workloads that do not require high availability or horizontal scaling.
However, Dokku is not a replacement for a fully managed PaaS like Heroku or a container orchestrator like Kubernetes. It lacks built-in multi-user support, automatic scaling, and advanced monitoring.
Teams with more than a few developers or applications requiring high uptime may find its limitations frustrating. Additionally, server security and maintenance fall entirely on the user.
Recommendation: Choose Dokku if you are a solo developer or small team comfortable with Linux who wants cheap, fast deployments. Choose Heroku, Fly.io, or Kubernetes if you need multi-region redundancy or team access controls.
For its target audience, Dokku delivers exactly what it promises: a minimal, self-hosted PaaS that works.
