openproject/docs/installation/system-requirements.md

# System requirements

__Note__: The configurations described below are what we use and test against.
This means that other configurations might also work but we do not
provide any official support for them.

## Server

### Hardware

* __Memory:__ 512 MB (1024 recommended)
* __Free disc space:__ 300 MB (4096 recommended)

### Operating system

| Distribution (64 bits only)     | Identifier   | init system |
| :------------------------------ | :----------- | :---------- |
| CentOS/RHEL 7.x                 | centos-7     | systemd     |
| Debian 7 Wheezy                 | debian-7     | sysvinit    |
| Debian 8 Jessie                 | debian-8     | systemd     |
| Suse Linux Enterprise Server 11 | sles-11      | sysvinit    |
| Suse Linux Enterprise Server 12 | sles-12      | sysvinit    |
| Ubuntu 14.04 Trusty Tahr        | ubuntu-14.04 | upstart     |
| Ubuntu 16.04 Xenial Xerus       | ubuntu-16.04 | upstart     |


### Dependencies

* __Runtime:__ [Ruby](https://www.ruby-lang.org/en/) Version = 2.4.2
* __Webserver:__ [Apache](http://httpd.apache.org/)
  or [nginx](http://nginx.org/en/docs/)
* __Application server:__ [Phusion Passenger](https://www.phusionpassenger.com/)
  or [Unicorn](http://unicorn.bogomips.org/)
* __Database:__ [MySQL](https://www.mysql.com/) Version >= 5.6
  or [PostgreSQL](http://www.postgresql.org/) Version >= 9.1

Please be aware that the dependencies listed above also have a lot of
dependencies themselves.

## Client

OpenProject supports the latest versions of the major browsers. In our
strive to make OpenProject easy and fun to use we had to drop support
for some older browsers (e.g. IE 11).

* [Mozilla Firefox](https://www.mozilla.org/en-US/firefox/products/)
* [Microsoft Edge](https://www.microsoft.com/de-de/windows/microsoft-edge)
* [Google Chrome](https://www.google.com/chrome/browser/desktop/)

## Screen reader support (accessibility)

* [JAWS](http://www.freedomscientific.com/Products/Blindness/JAWS) >= 17.0