Senior Linux AdministratorGeneral Activities:Providing Support to 5000+ Linux Servers.Monitoring system resources, like network, logs, disk usage etc.User account creation and account maintenance.Perform all duties related to system administration like troubleshooting, providing sudo access, modifying DNS entries, NFS , backup & recovery (scripts).Setup password less login using ssh public – private keys.Setting up cron jobs for the application owners to deploy scripts on production servers.Package installation and up gradation using RPM and YUM.Sharing NAS mount points from storage to client.Performed check out for the sanity of the file systems and volume groups.SSL certificate renewal for more than 1000+ websites.Checking JVM status and start ,restart applications as per the customer confirmation.Completing Work Request raised by customer/team and following up with them.Working on Change Request raised by customer/team and follow up.Doing Root Cause Analysis on Problem Tickets and frequently occurring incidents.Kernel up gradation and Kernel Patching.Changing kernel parameters as per DBA requirements.Encrypting and decrypting files with GPG.Kdump configuration and analysis Knowledge of configuring the LDAP Server and authenticating the user. Configuring the ISCSI initiator and target to configure the storage and use them for the RHEV environment. Configuring and maintaining file sharing server such as NFS,FTP,SAMBA. Raising Case with vendors if any software or hardware needs to be updated/replaced/repaired.Update firmware on Servers, Installed patches and packages for security vulnerabilities for Linux. Knowledge of server hang and kernel panic analysis. Hands on experience on performance analysis for production servers.Deployment of Red Hat Cluster and Storage in RHEV and KVM environment Evaluating the server load process wise and suggesting for the performance tuning