Installation, configuration, maintenance, backup and recovery, troubleshooting, performance tuning, security hardening...
- Debian, Ubuntu, Centos, Slackware, Suse, FreeBSD, NetBSD, OpenBSD
- Apache2, Nginx, Tomcat
- Mysql, Postgresql
- Iptables
- Ipfw
- Ossec
- OpenStack
- Kvm
- Amazon Web Services
- Rackspace cloud
- Linode
- Postfix, Mailscanner, Amavis, Spamassassin, Dovecot, Courier, Clamav, Roundcube, Sqwebmail, SquirrelMail
- Bind9
- VPN
- Squid
- Git, Subversion
- DHCP
- Memcache, Redis
- Webmin, Usermin, Virtualmin, Cpanel, Ispconfig
- Samba
- GlusterFS
- Galera cluster
- Cacti