Server Monitoring Software
 

What software do you use to monitor dedicated servers that you use/sell? Where can the software be purchased at and what does it cost? I was thinking of coding my own, but if I can find the software available at a reasonable price I would perfer to purchase it.

What server system are you using?

Right now all 6 of my servers have cent OS on them. What I want is a program that monitors them and lets me know if one of them goes down.

Go with Nagios and Cacti.

http://www.nagios.org
http://www.cacti.net

A solid combination better than just about any commercial offering when well configured.

However if you want to just measure up time of a single server it may be overkill and a web based ping service may be a better bet.
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synthetic weed

I can second the Nagios suggestion. My old job we used Nagios to monitor about 2000 servers with about 20,000 services combined. I've used it before on my own network, but it was a little overkill (like hackertarget mentioned) for my piddly 4 servers, lol, so I removed it from the network.

I only have 1 dedicated server currently, so I use www.pingdom.com for server monitoring. When I signed up they were having something like a 75% off sale, which worked out quite well for me.

I haven't looked into Pingdom prices for when/if I exceed their basic package, but if at some point it is no longer cost effective to use them for monitoring I will be checking out Nagios if that time comes.

I've never heard of Cacti until now... It also looks like a good product, thanks for posting that link.