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Since `docker build` is only invoked when actually building a new image from a Dockerfile, using `--no-cache` allows to have an updated image even if the Dockerfile hasn't changed. This works well with Dockerfiles using `git` or packages referencing latest versions instead of "static" ones.
Dokku 
Docker powered mini-Heroku. The smallest PaaS implementation you've ever seen. Sponsored by our friends at Deis.
Requirements
- A fresh VM running Ubuntu
14.04 x64
Installing
To install the latest stable release, you can run the following commands as a user that has access to sudo:
wget https://raw.github.com/progrium/dokku/v0.3.18/bootstrap.sh
sudo DOKKU_TAG=v0.3.18 bash bootstrap.sh
Upgrading
View the docs for upgrading from an older version of Dokku.
Documentation
Full documentation - including advanced installation docs - are available online at docs
Support
You can use Github Issues, check Troubleshooting in the documentation, or join us on freenode in #dokku
Contribution
After checking Github Issues, the Troubleshooting Guide or having a chat with us on freenode in #dokku, feel free to fork and create a Pull Request.
While we may not merge your PR as is, they serve to start conversations and improve the general dokku experience for all users.
Sponsors
Dokku is currently sponsored by the enterprise grade, multi-host PaaS project Deis.
License
MIT