What do you use for server/site monitoring?
 

Is anyone using nagios to monitor their servers?
If so would you be willing to tell me what you think of it?
It looks like a bear to config.
I want to be able to monitor if specific urls are up and responding, how long they are taking to respond, if payment processors are responding, server resource usage, hd space used, etc.
What do you use to track your servers/sites?

We use Nagios to monitor and manage approx. 20 servers, layer 7 switch and Cicco Catylst ... Nagios is great for not only the hardware and OS monitoring but also 'business logic' monitoring of your sites features and functions, we then wrap it up in SMS and email alerts with nagios actually performing basic server maintence as required (restarts etc.) ... ICQ me and I'll put u in touch with my admin guy if you need any help.

Nagios is a great piece of software. It's not too hard to configure, but if you're not comfortable installing Linux applications, it'll be a "bear".

I use Nagios and custom code to monitor the servers and sites that I'm responsible for. For me Nagios is a good general catch-all, but my custom software extends monitoring and makes monitoring flexiable and easy.

I'd highly reccomend Nagios. It's widely used, so if you need any help installing / configuring it, there is a ton of online support.

We use a base platform of Cacti (snmp/rrdtool) to do our acutal monitoring but we've written a significant amount of custom code on top of it, so much so that I'd say it's roughly the same level as nagios but it's an all in one solution rather than running serveral apps to do monitoring, charting, etc.