How to monitor log files via Nagios

Is it possible that i can monitor . kernel log messages , apache error logs , mail log messages via nagios.

I have three linux servers and i want that on every server there should be something so that i can see all log files from one locations

I am new to nagios so i don't know

From serverfault Master

• There's a whole category of Log Monitoring plugins over on the Nagios Exchange. The check_logfiles plugin looks promising. You should know, though, that there's no "magic" log monitoring plugin. You need to be able to tell the plugin what you're looking for (in the form of a regular expression) so that it can alert you when it finds a match.

  Master : Is nagios only monitors for some expression or is it possible with nagios that , when i click on log file , it then opens the current contents of that file. i just want to view the contents from one location

  ErikA : Oh, just viewing log files is really outside of what Nagios does. For that, you should first get all of your servers sending their logs to a central syslog server. Then from there, give php-syslog-ng a try: http://code.google.com/p/php-syslog-ng/
  From ErikA