RedHat/CentOS server administration. Configured diskless PXE booting environment. LAMP stack configuration. JAVA application support. Designed and implemented load balanced and highly available three tier web architecture (PHP and JAVA). Managed KVM clusters with more than 3000 virtual machines. Secured the websites using SSL. Linux server security hardening. Configured centralised authentication mechanisms like OpenLDAP. Configured firewalls for servers. Provisioned and managed KVM virtualisation infrastructure. Managed RHEV clusters using RedHat Enterprise Virtualizstion Manager (RHEVM). NetApp SAN/NAS administration. Configured iSCSI Storage Area Networks (SAN). Asterisk PBX VoIP server management. Managed web hosting panels like cPanel/WHM. Tomcat, Apache and NginX server administration. DNS master-slave configuration. Troubleshooted and fixed performance issues in servers. Configuration/package management using Spacewalk and RHN Satellite. Monitored Linux servers using Nagios and Cacti.