if you want to use LUKS In-Place Conversion Tool, the notes below on converting a shipped-with-Ubuntu Dell XPS 13 Developer Edition (2015 Intel Broadwell model) may help you. There were a couple of small learnings to be had...

Finally Let’s Encrypt went public with their open source, easy to use, SSL certification solution (Available for everybody, starting on the 3rd of December).
And yes, it’s free! As I’m writing this, Let’s Encrypt is still beta status, but working well in a productive environment. Check out their site to understand how it works.

We have an advanced webpage (ASP.NET, C#), and a application which needs to be installed on the client computer in order to utilize the webpage to its fullest. The application is a tray app, and has primarily two tasks. Detect when certain events happen on the webserver (for instance invited to a meeting, or notify of an upcoming meeting). The other task the trayapp has is to use a custom protocol (trayapp://) to perform some ajax calls back to the server.

One of the problems we needed to solve for our customer was how to package and distribute the appliance. We quickly determined that an OVF or “Open Virtualization Format”-based approach had the potential to give us the greatest portability, and I set to work figuring out how to implement it. Our build process made use of VeeWee, Vagrant, and Chef. We knew we could export some kind of appliance.box package compatible with VirtualBox from Vagrant, but how this related to OVF wasn’t clear.

I’d like to share a few of the things I learned. This is not by any means a comprehensive guide or list to the vast world of virtualization technology, but hopefully it can save someone else some time in making sense of this portion of the virtualization ecosystem.

To configure a DHCP client manually, modify the /etc/sysconfig/network file to enable networking and the configuration file for each network device in the /etc/sysconfig/network-scripts directory. In this directory, each device should have a configuration file named ifcfg-eth0, where eth0 is the network device name.