Nagios Support Forum

Is there a way to monitor linux logs especially mysql logs?

There are a number of check_log plugins on the exchange:
http://exchange.nagios.org/index.php?op ... =check_log

There are quite a few log file plugins that check regex within the files:

http://exchange.nagios.org/directory/Plugins/Log-Files

I believe the most popular is this one:

http://exchange.nagios.org/directory/Pl ... es/details