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Rails has announced the availability of 3 news versions today,  3.2.13, 3.1.12, and 2.3.18, these releases contain important security fixes. It is recommended users upgrade as soon as possible.

Zend Optimizer+ is to be integrated into the currently-in-development PHP 5.5. The announcement was made by Zeev Suraski, CTO and co-founder of Zend Technologies.

As system administrators, we’d better know SystemTap and be able to assemble its existed recipes for comprehensive system analysis. When I am on my way to make a collection of  systemtap scripts, I realize that I should give a brief introduction to this powerful design first, although it has been [...]

The first release candidate of Debian 7.0 (a.k.a. Wheezy) was released yesterday. As always, it comes with lots of attractive designs. Here is a list of the major ones that may draw your attention.        

Fedora Linux version 18 has been released today at Jan, 15. Fedora Linux is considered as the third most popular Linux distribution, behind Ubuntu and Mint for desktop usage. The new version comes with several new features such as – an installer that is rewritten and redesigned from the ground [...]

I had occasion recently to try and figure out how to use the builtin firewall to prevent some “bot” from hitting the services running on a Macbook. Mac OS X comes with the FreeBSD firewall program that called IPFW. It’s a very powerful tool and gives you good abilities to manage your [...]

In our time, pictures that are generated by digital cameras are usually some megabytes in size, which is really big for a convenient use. This post is about a collection of command-line tools that can be used to do lossless optimization for different types of pictures, in order to keep them in a reasonable [...]

When your working environment grows, services may have dependencies with each other, and this would affect your implementation of an effective monitoring solution. In typical cases, the status of a service cannot be judged simply by itself, and we have to query the status of its brother (upstream, or [...]

Well, this is just a forwarded version from Xaprb.com, the highlighted points are a good summary. I don’t fully understands all the germs till now. The manual page is  worth a careful read if you want to know more details.

Note that this is a forwarded version from serverfault.com, and the original post is here.  Xen is an hypervisor that runs on metal (the pc / server) and then hosts virtual machines called domains.