[CentOS] - monitoring software

Fri Oct 18 12:49:48 UTC 2013
Paolo De Michele <paolo at paolodemichele.it>


I have a dedicated server with several services running: ssh, ftp, httpd 
(with several sites andactive domains), the mail server (dovecot, 
postfix), dns.

I'd like to monitor all of these services in a graphical, easy, setting 
of thresholds and alerts via email.
I would also like that if a customer wanted to see the graphs I could 
create codes read-only.

there is one or more software that are right for me?
what advice can you give me?
thanks in advance