So I’ve been running on the Rackspace cloud for a week or so.
The server stays up:
w 22:45:08 up 4 days, 17:23, 1 user, load average: 0.34, 0.10, 0.10 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT root pts/0 cpe-XXX-XXX-XXX- 22:45 0.00s 0.01s 0.00s w
And it uses memory but can also page some of it to swap if necessary
free -m total used free shared buffers cached Mem: 496 275 220 0 11 51 -/+ buffers/cache: 212 284 Swap: 1023 25 998
I must say getting a Apache+mod_fcgid+mod_security+SuExec+PHP5+mysql setup going takes a big chunk of time to do from scratch. But it’s interesting! If you charged you own time out to do it you would probably be uneconomic and might better off paying for a managed service but hey if you “get your geek on” then you can learn alot about creating a shared hosting setup.
The Rackspace offering seems solid.
They have a good knowledge base. Knowing from Rackspace KB documents that Cloud Servers aren’t trusted as SMTP servers I have configured the local postfix instance to relay through Gmail which seems to work fine. You also get a mail archive in the Sent Mail folder of the Gmail account which may or may not be a good thing.