Display live Linux system stats (memory, CPU, IO, etc) in a pretty web-page, with charts and everything.
Linux (and many other UNIXy operating systems) have a command line tool called vmstat for monitoring system stats.
It looks like this (a new line is output every second showing the latest values):
$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 246784 88976 144640 502132 0 0 9 15 15 6 0 0 99 0 0
0 0 246784 88984 144640 502132 0 0 0 0 79 155 0 0 100 0 0
0 0 246784 89488 144640 502132 0 0 0 24 99 229 1 0 99 0 0
0 0 246784 89504 144640 502132 0 0 0 0 79 168 0 1 99 0 0
0 0 246784 89504 144640 502132 0 0 0 0 74 163 0 0 100 0 0
Useful, but fugly.
This is a tiny application that streams these stats over a WebSocket using ws and charts them using SmoothieCharts.
Why not? A handy little process to install on machines you care about. After building this for my own needs, I thought it would make a great little demo.
And if you want to use it or hack on it yourself, here it is.
Inspired by the original web-vmstats by Joe Walnes.