Monitoring system for build, source control and integration servers

Question

Do you know about any lightweight system that will monitor servers in terms of disk space, CPU usage, uptime/availability?

I'm talking mainly about DB, Subversion, Hudson, integration, qa and build servers. All the advanced server monitoring tools are very hard to configure and use. So I'm looking for something simple.

Open source tools are preferable.

Answer 1

We are using Hostmonitor.
Simple to setup, use and at a very reasonably price.

HostMonitor can check any TCP service, ping a host, check a route, monitor Web, FTP, Mail, DNS servers. It can check the available disk space, monitor size of a file or folder, check integrity of your files and web site; it tests your SQL servers, monitors network traffic and much, much more.

Answer 2

Nagios is very good. Super flexible and can monitor just about anything. It can also execute workflows when certain events/alerts happen. And it's free.