By far the best tool for real-time monitoring. Beats munin/monit, plus, easiest to install too: https://github.com/firehol/netdata/wiki/Installation Just wanted to let you know it exists.
I will plus one for this, its absolutely beautiful. However it only logs the last few hours so its better for short term 'why did my server jst crash' type stuff, rather than seeing longer term trends. I still use Nagios as well for that.
