Server monitoring

To make all sorts of graphs:

apt-get install munin munin-node

Example: http://munin.ping.uio.no

To compute more statistics:

* anteater
* isoqlog
* mailgraph

Monitor system logs: logcheck:

* sends you mail with abnormal log lines
* It's important to customize what is normal and you do it with regular expressions

Source: http://www.enricozini.org/blog/eng/seventh-day-in-addis.html