Graphing Access Log Status with PNP4Nagios, part one 20
When I started at $WORK we had little by way of a comprehensive monitoring system, and rectifying that quickly became my top priority. I rolled out Nagios, and needing a way to trend historical performance data, added "pnp4nagios"http://docs.pnp4nagios.org/pnp-0.4/start" on top of that. Over time I had a real desire to see what were the breakdown of 200s, 403s, 404s, 500s and other status codes being logged by our various web servers. What I wanted were graphs like this (oops, no traffic on the 20th),
or something that illustrated that it was okay when our backend Day Communique CQ5.3 publisher was running 80% error rates late in the afternoon (because our front-ends had cached all the 200 OK objects, but the 404s were still getting passed to the backend; in the morning, the publications flushed the front-end cache, and most 200 would go to the backend again):
Anyhow, setting up PNP4Nagios to generate these lovely, zoomable graphs will be the focus of my next post.