Technical knowledge covering a variety of platforms from PC's to Linux/Unix servers.
Installing and maintaining servers running Linux/Unix/BSD OSs, with Mail Servers(Exim,Qmail), Web servers(Apache,LiteSpeed,Lighttpd), Firewalls and Server Protection(including DDoS), SQL Servers(MySQL,PostgreSQL), control panels including but not limited to Cpanel, Plesk, Directadmin.
Linux servers virtualization including VMware, Virtuozzo, OpenVZ, XEN.
Linux servers clustering, software or hardware(ServerIron/Foundry) based .
Linux System Administration