All the information that you need to install OSEM. If you have any problems with installing don't hesitate to [contact us](https://github.com/openSUSE/osem#contact)
## Versions
OSEM is an [semantic versioned](http://semver.org/) app. That means given a version number MAJOR.MINOR.PATCH we increment the:
1. MAJOR version when we make incompatible changes,
2. MINOR version when we add functionality in a backwards-compatible manner
3. PATCH version when we make backwards-compatible bug fixes
## Download
You can find the latest OSEM releases on our [release page](https://github.com/openSUSE/osem/releases/latest) ([older release here](https://github.com/openSUSE/osem/releases))
OSEM is a *Ruby on Rails* application. We recommend to run OSEM in production with [mod_passenger](https://www.phusionpassenger.com/download/#open_source)
In order to use [openID](http://openid.net/) logins for your OSEM installation you need to register your application with the providers ([Google](https://code.google.com/apis/console#:access), [GitHub](https://github.com/settings/applications/new) or [Facebook](https://developers.facebook.com/)) and enter their API keys in `config/secrets.yml` file, changing the existing sample values.
Note:
Based on environment, please do the replacement in the below steps under the respective environment sections.
Steps to be followed:
1.Create 'config/secrets.yml' file.
2.'config/secrets.yml' file has to be similar to the 'config/secrets.yml.example' file.
3.Run 'rake secret' and note down the secret key base.
4.Set this secret key base to the secret_key_base placeholder.
5.Now we have to register your application with the providers ([Google](https://code.google.com/apis/console#:access), [GitHub](https://github.com/settings/applications/new) or [Facebook](https://developers.facebook.com/)).
a.In order to register with the application, we will take an example of how to integrate facebook and it can be similarly done with other providers.
b.Join as a developer on https://developers.facebook.com.
c.Create a new app and complete filling your app details.
d.On the app's dashboard, the app's ID/key and app's secret will be present. Note them down.
e.Replace the noted values in facebook_key and facebook_secret placeholders in 'config.secrets.yml'.
Open a separate terminal and go into the directory where the rails app is present, and type the following to start the delayed_jobs worker for sending email notifications.