Dokku: the smallest PaaS

Dokku is a mini- Heroku , made on the basis of Docker and consisting of less than 100 lines on Bash.

After installation, you can publish your applications with a simple git push. Each application will run in an isolated container. Ultimately, you will have your own Heroku-like platform.

Dokku is so small because it consists of several components that do all the hard work: Docker, Buildstep and Gitreceive.

Docker is a container for Linux. This container provides technology similar to Heroku Dynos. This is the heart of Dokku.
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Buildstep uses open source Heroku's buildpacks and is responsible for creating the base images on which the application will run. You can think of it as a “stack” of Dokku.

Gitreceive handles git push and runs a special hook.

Also, there are several other projects developed to support Dokku and extend its functionality without increasing the number of lines.

I recorded a screencast describing the installation of Dokku and a little explaining how it works.