- OS - BIOS (resume on powerback,watchdogs,ipmi,) - raid - lvm - ipmi - watchdog - test powerfail - test watchdog - test stress - test boot from second hdd - hostname - reverse dns - LAMP - snmp - vnstat - sysstat - apache/mysql/php/vsftpd - backup - firewall - portaudit/portupgrade + nagios-portaudit - munin