Let's talk Linux. I'm an LPI Certified Level 3 Linux systems administrator with about a decade's worth of experience in playing with Linux machines for all sorts of uses both professionally, but also as my own personal desktops and servers are in Linux. I've used various distros, such as CentOS, Debian, Arch, even Gentoo; and configured them in various roles: firewall, proxy, email, backup, vpn, db, web.