Fully optimized and managed up 100 server nodes in a HPC farm and gained 15X more more power and scalability. Maintaining and defining, default or new SELinux policies specifically catered to a particular environment.Secure setup and management of OpenVPN, IPSec and SSH gateways and bridges, as well as implementing policies for secure key management for intended infrastructures.Setup and maintenance of secure tunnels ( SSL/TLS,SSH,VPN) for accessing applications on the LAN side without exposing them to Internet.Install, configuration and performance tuning of LAMP (Linux,Apache,MySQL,PHP)Installation and configuration of MTA's, MUA's and MDA's (SMTP,IMAP,POP) Exim,Postfix,Sendmail,QMail,Cyrus. Installation of "ALL-IN-ONE" server management solutions such as Zentyal, CPanel, WHM, VirtualMin, Webmin, Plesk.Full interoperability and full unison of Windows, Linux, Apple and Unix file sharing using SAMBA aided by Kerberos and/or LDAP if needed as a prerequisite by the environment.DNS a