Just to confirm, I managed to install cPanel on a Rackspace Cloud CentOS server fine! I used a 4GB RAM machine (the plan was to use a good server for the install in order to make it happen quicker, though not sure if this made any difference at all) and it took about 3 hours to install in total - thought it was going to fail at one point after it resarted spamassassin (hung there for several minutes) but it kept going in the end and seems to be ok!
Of course, need to get some websites on there to see how it goes, and I'm keen to see how it handles the VPS increasing/decreasing in size, but it seems promising.
By the way, in the install guide, it says that you recommend 40GB for a cPanel installation, but going to WHM > Server Status > Server Information > Current Disk Usage shows the following in use straight after installation:
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 150G 4.0G 139G 3% /
none 2.1G 0 2.1G 0% /dev/shm
/usr/tmpDSK 485M 13M 447M 3% /tmp
So it's currently using just over 6GB in size, whilst the System Requirements page for cPanel says it needs at least 10GB in hard disk space. Besides the disk space used for websites, does this 6GB grow much with updates etc over time?
Also, 6GB seems quite a lot - are there any resources out there to trim this down by maybe disabling/removing non-essential features?