As you well know InnoDB will store its data either in one big system tablespace called ibdata or you can store it in multiple tablespaces (innodb_file_per_table). In either case InnoDB by default will not reclaim unused space gained when deleting data. Using innodb_file_per_table will separate each InnoDB table in its own .ibd file and it can be easily reclaimed by doing optimize table, using system tablespace will get you stuck since there is no real supported method for reducing you ibdata file and reclaiming unused disk space.

There is a long time now from my original post on running Django with python 2.6 on cPanel based servers, and as time passed there was some issues while deploying Django in such a way. So I decided to post another post with some updates regarding deployment of any python based scripts trough mod_wsgi and cPanel.

Here is the simple to follow step by step tutorial on howto run latest Django on cpanel powered servers with python 2.6, virtual env and mod_wsgi.
If you are running cPanel on your server it's most probably a rhel or centos distro, and those will have by default python2.4 installed. You can't just overwrite your python2.4 as many of the system utilities are depended on the python2.4 So what we will do is install an alternate python 2.6 and setup our server to run Django instances with python2.6

Munin is a great tool for performance graphing your servers, by default it will graph resources on localhost, however if you wish to monitor multiple servers from single location, then you must deploy a central Munin server.

Having central graphs mean you can have central hub of data about performance of your systems. This can later be better presented, viewed and analyzed,

Occasionally you will wish to block certain ports to your DomUs from Dom0. By default you wish to allow any traffic from and to DomU but for some security considerations, I found it to be wise to block some ports to and from my clients DomUs. One such port range is for example IRC. Although it can be routed trough alternate ports, most of automated malicious scripts use default ones. It's quite handy to block them so they ain't able to contact home.