I'd like to monitor the rate of 404, 403, 500 etc errors in my Apache logs with Munin but I can't find a plugin to do this. Surely it exists?
I did the same kind of monitoring for another service (spam filter), never with Apache. However, the idea is the same.
You have to code a little script which will parse the log files and analyze them. Munin will launch the script every like 5 minutes.
The script uses
I hope you get the point.
Sorry I can't give you the script, I moved to another company.
Here's a plugin that might help. It monitors various request codes by parsing the log files.
Near the top you can set the codes you care about:
You can also configure how many recent log lines it looks at and what log file to parse.
To be honest you are probably better off writing your own plugin. It's really simple and you can customize it for your needs (for example, does your system use logrotate? etc.) – plus, you get to write your first munin plugin.