Logrotate

Log files are important for Linux system security and trouble shooting.  Log files tend to grow, and if a log grows too much you compress it and takes the backup. Logrotate enables you to do this in a much better way. The process that is in charge of compressing and rotating these logfiles is called logrotate and it is executed once per day upon Debian installations.

Here you will find the logrotate driver script. Every day this script runs and examines two things:

• The configuration file /etc/logrotate.conf
• The configuration directory /etc/logrotate.d/

A typical logrotate configuration file looks like this:

/var/log/apache/*.log {
        weekly
        missingok
        rotate 52
        compress
        delaycompress
        notifempty
        create 640 root adm
        sharedscripts
        postrotate
                if [ -f /var/run/apache.pid ]; then
                        /etc/init.d/apache restart > /dev/null
                fi
        endscript
}

If you want to add new log rotate for any other file you can new logrotate configuration file to /etc/logrotate.d 

Assuming we have a new service “mon” which produces its output in /var/log/mon/mon.log we can cause this to be rotated every day with a script like this:

/var/log/mon/*.log {
  daily
  missingok
  rotate 7
  compress
  delaycompress
  create 640 mon mon
  sharedscripts
     /etc/init.d/mon restart
  endscript
}

For more help man logrotate