ā Linux/Unix System Administration - Installation and Configuration
Storage: ISCSI, DRBD, GlusterFS, and Ceph.
File servers: FTP, NFS, and Samba.
Web Server: Apache, Tomcat, and Nginx.
Database: MySQL, Postgres, MongoDB
Cache & Proxy: Squid, Nginx, and Lusca.
Mail Server: Postfix, Sendmail, IredMail, Qmail, and Zimbra.
Automation: Ansible.
Network Services: DNS, NTP, VPN, and DHCP.
Security: IPtables, Firewalld, SELINUX
Monitoring: Nagios, Zabbix, and Cacti.
ā Virtualization and Cloud Computing
VMware: VSphere 5.x, VSphere 6.x
Cloud: OpenStack
Hyper-V