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linux - Running multiple sites on a LAMP with secure isolation

I have been administering a few LAMP servers with 2-5
sites on each of them.
These are basically owned by the same user/client so
there are no security issues except from attacks through vulnerable deamons or scripts.
I am builing my own server and would like to start hosting multiple sites. My first
concern is... ISOLATION. How can I avoid that a c99 script could deface all the virtual
hosts? Also, should I prevent that c99 to be able to write/read the other sites'
directories? (It is easy to "cat" a config.php from another site and then get into the
mysql database) My server is a VPS with 512M burstable to 1G. Among the free hosting
managers, is there any small one which works for my VPS? (which maybe is compatible with
the security approach I would like to have) Currently I am not planning to host over 10
sites but I would not accept that a client/hacker could navigate into unwanted
directories or, worse, run malicious scripts. FTP management would be fine. I don't want
to complicate things with SSH
isolation.




What is the best practice
in this case? Basically, what do hosting companies do to sleep well?
:)



Thanks very much!
David

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