====== Important log files to monitor ======
  
  - /var/log/messages (system application logs)
  - /var/log/secure (all authentication events)
  - /var/log/boot.log (boot messages during system startup)
  - /var/log/dmesg (info about hardware devices and drivers)
  - /var/log/cron (cron jobs info)
  - /var/log/yum.log (monitor package changes)
  - /var/log/maillog (mail logs)
  - /var/log/dovecot.log (dovecot log file)
  - /home/vmail/dovecot-deliver.log (dovecot mail log)
  - /var/log/httpd directory (various apache logs)
  - /var/log/mariadb/mariadb.log (mysql log file)