I love UNIX!
I love one-line shell scripts!
I work with Debian, RedHat, HP-UX. Little with OpenSolaris and FreeBSD.
I have experience in creating and supporting monitoring systems based on Zabbix and Nagios (several tens of servers with different OS).
I am well familiar with network protocols and tools for testing and troubleshooting (wireshark, tcpdump, nmap, traceroute, etc.).
I have experience in creating secure VPN tunnels based on OpenVPN, IPSec, L2TP/IPSec, GRE and PPTP.
I was installing and configuring lighttpd, apache httpd, nginx, exim4, dovecot, samba, OpenLDAP, etc.
I have experience with creating mail servers used in hosting company for many customers.
I was working with virtualization Xen, KVM, VMware.
Have experience with cloud services like Amazon EC2.
I have experience in installing and configuring Oracle 10g, 11g, PostgreSQL, MySQL.