To stop the tomcat for making a big catalina.out file, use logrotate to rotate the logfiles as needed

For most Linux distro's:

/pack/confluence/logs/catalina.out {
        daily
        rotate 7
        compress
        copytruncate
        delaycompress
        missingok
        size 10M
        notifempty
}

This rotates the logfile dailay, and keep 7 copies. Refer to http://linuxcommand.org/man_pages/logrotate8.html