It’s a great day for CentOS and its community because, according to Web Technology Surveys, in July 2010, “For the first time, CentOS is now leading the Linux distribution statistics on web servers with almost 30% of all Linux servers.”
Read more at W3Techs
The one problem with Xen is transparent high availability of your servers, sure you can snapshot an image but thats only of you shutdown the virtual machine. How excited was I when Remus announced that it has been applied to the official Xen repository, and is expected to be included with the next major release. Bookmark this page for a soon to be released how to install Xen with Remus support on CentOS 5.4!
What is Remus?
Remus provides transparent, comprehensive high availability to ordinary virtual machines running on the Xen virtual machine monitor. It does this by maintaining a completely up-to-date copy of a running VM on a backup server, which automatically activates if the primary server fails. Key features:
* The backup VM is an exact copy of the primary VM. When failure happens, it continues running on the backup host as if failure had never occurred.
* The backup is completely up-to-date. Even active TCP sessions are maintained without interruption.
* Protection is transparent. Existing guests can be protected without modifying them in any way.
For a full description and evaluation, see their NSDI paper.
Visit the project: http://dsg.cs.ubc.ca/remus/
RT @CentOS: 5.4 is baked! CentOS internal network will start syncing up today. Release ~ soon!
CentOS 5.4 will be hitting our local CentOS mirrors and YUM repositories shortly, so in anticipation for the release lets take a look at the history and trends of CentOS 5 releases.
The Google Trend graph below shows a nice steady upwards trend on the generic CentOS search phrase which is a good indication of a growing and stable Linux distribution.
The below Google Trend graph compares the different versions of CentOS 5. What’s great to see is that there is a steady overall growth in the CentOS camp and with every new release, with the previous version tailing off, the newer CentOS version takes the lead and continues the steady upwards trend.
The initiator is actually a kernel module that is already available with the appropriate CentOS Linux installation. To use and manage the initiator, you need to install the iSCSI utilities.
Continue reading “ISCSI Initiator Configuration and Mulitipathing Guide”