Typically if you need to monitor Apache, you have to rely on log file analysis or the built in server-status tool via mod_status. I wanted something better to monitor all the hosts on my web cluster.
Now that I’ve got realtime Apache log consolidation working, I found a cool utility in Theo Schlossnagle’s book, Scalable Internet Architectures that let’s you see realtime response code stats for your web cluster. I call the thing wwwtop.
The output looks like this, using the first four hosts with a one-second interval:
Looks like I’ve got some 404’s to hunt down.
- pretty aggregate output, similar to mytop.
- a version to monitor APC stats the same way
Combined with top, vmstat, bmon, mytop, and now this, I’ve got a complete toolkit for monitoring the web stack.