How to make screencast on Ubuntu 14.04

There is a lot of software for screencasting, subtitles making and video mastering for Ubuntu and you can create awesome demo with a lot of effects.
But what if you want to create a simple demo by using only free software?
Unfortunately I could not find a one application for Linux to screencast, create subtitles and add subtitles to the video. I had to use 4 different applications.
So I'm going to tell you how to:

• Create screencast video
• Create subtitles with the custom style
• Add subtitles to the video

Apache Fortress instead of policy.json in Openstack Keystone

Openstack uses json file (policy.json) to set rules for Role Based Access Control. But this approach is not very elegant and has several problems.
Let's take a look how we can replace policy.json by Apache Fortress - access management system based on ANSI Role-Based Access Control (INCITS 359) standard. Apache Fortress stores rules in OpenLDAP or ActiveDirectory and has a nice Web interface: