Experience of linux operating systems rhel, centos, ubuntu and suse.- experience on physical and virtual environment- good knowledge of linux scripting languages bash, ansible, and cis- experience in cluster configuration.- good knowledge on upgrade, migration and patch of linux based operating systems.- user management.- experience in lvm, yum- experience installing, configuring, and maintaining services such as sftp, ftp, mysql, ntp, nfs, samba etc.- knowledge on puppet and ansible.- familiarity with firewalls, patching process etc.- experience with virtualization technologies, such as vmware- ability to build and monitor services on production servers.- rhel 6/7 - certification and hands on experience.- basic understanding on storage and network.- working knowledge of ibm aix/solaris/hp-ux operating systems would be an added advantage.