Oracle Unbreakable Linux

In last month, oracle has announced enterprise support for her linux, named "Unbreakable Linux". This way, Oracle offers the same support level that provides for its database product.

Historically, first commertial database for linux was Oracle and the company affirms that your employees contributes for Kernel development

The company is offering free trial for all customers. Starting from October,1º and ending on January 31, 2007. If you use RHES3 or RHES4 just need download "Up2date" from Oracle and you receive bug fixes and new versions from Oracle.
I instaled Oracle Linux in last week, and posted a screenshot of the installation. See a preview below:

UML - Linux in another linux

Wich UML, you can run one linux inside another!
There are several things you can do wich UML. It's very usefull for testing upgrades in your servers, kernel development, or just for funny.
To do this, basic steps are:

• Download and install Uml package (uml-utilities user-mode-linux)
• Download kernel sources and apply correspondent Uml kernel patch
• Compile kernel for architecture=uml
• Download any filesystem from UserModeLinux page.
  
• Run!!!

At uml pages you can download many distros (redhat, debian, slackware), but you can make your own filesystem! Many tools are avaliable for that. It's possible run graphicaly X or just command line.
I post few links bellow where you can find good documentation and "how to", and links for other tools necessary for run virtual network.

http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO.html - The main site. It have step-by-step how-to, very recommended for
http://user-mode-linux.sourceforge.net - This is official page. You will find many documentation here.
http://user-mode-linux.sourceforge.net/networking.html - How to running network in virtual machine. I'm using TUN/TAP and it's working fine.