Lightweight (plug and play) machine resource monitoring utility?

Question

I need to monitor my Ubuntu Linux server performance, prior to diving into nagios / zabbix type of "enterprise server monitoring" solutions I would prefer something more lightweight.

My requirements are simple:

• Works out of the box for basic metrics (memory, io, cpu, network, disk-space and co...)
• Has web interface which shows graphs

The list of nice to have goes deep:

• Has embedded http server (if it would be a ruby / python solution it would be awesome)
• Has real time updating page
• Can show what happened a week ago / month ago / custom range
• Supports monitoring of software components: number of open file descriptors, jvm GC activity, opened TCP sessions in the last hour (and co.)
• Has statistics

I've looked into ganglia, munin and they require Apache to be running the web front end.

-- Edit:

Effectively I would be happy for something that can collect and graph sysstat or dstat in rrd format and make it accessible as a web page

Answer 1

You could try something like Server Density (http://www.serverdensity.com/). Although it is not free, it is quite a nice service.

And because Server Density allows plugins, you can literally build anything to monitor on the system with ease.

Answer 2

sysstatgraph looks like a nice start