Harish Jagu

Dynamic IT Consultant with extensive experience, specializing in infrastructure architecture, and Linux server management. Proven expertise in RedHat and AWS, enhancing system performance and security. Adept at vulnerability remediation and lifecycle management, demonstrating strong problem-solving skills and a commitment to operational excellence.

• Having 7 years of experience in Linux System Administration expertise with RedHat Linux 4, 5, 6, 7, 8 & 9.
• Configure Logical Volume Manager which involve creating and modifying file systems, logical volume, physical volume, volume groups and resizing.
• Managing 1500+ servers 16x5 remotely on a production server.
• Responding to alerts in a timely fashion as per the pre-defined priority level and SLA's.
• Expertise in Installing RHEL.
• Providing day-to-day user administration like adding or deleting users, password ageing.
• Changing user primary/secondary group.
• Changing ownership or permission of a file/directory.
• Checking sticky bit on public shared directories.
• File system clean-up, disk utilization activities.
• Copy files systems from one to another server using FTP/SCP.
• Managing swap & memory utilization.
• Adding storage luns to existing volume group.
• Increasing and decreasing file systems on logical volume manager.
• Performance monitoring & system utilization.
• Establishing trusted authentication by generating a public key and private key between nodes.
• Checking Data consistency of file system using fsck and other utility.
• Configuring and administering NFS and autofs on RedhatLinux server environment.
• Resolving boot issues and maintenance of server issues using rescue mode and single user mode.
• Collecting kdump when the server got rebooted automatically and upload vendor portals to get the RCA.
• Cleaning log files and compresses old logs on os file systems.
• Troubleshooting server for root cause analysis.
• Schedule hardware replacements based on downtime request, work with the vendor.
• Executing change management steps on prod-servers based on requests.
• Coordination with the application, database owners and change management for any business requirement and incident/issue reported.
• Working on backup issues and restoring the files to the request.
• Modifying the kernel parameters to utilize the server as per our requirement.
• HBA driver and firmware version upgrade on HP physical server.
• Managing the AD user authentication by using Delinea Access Manager.
• Configuring and managing the RedHat Satellite server and registering the client server to apply patches on server.
• Updating the RedHat Satellite Versions.
• Applying the remediation/work around for the reported vulnerabilities on RedHat servers.
• Launching and configuring of amazon EC2 cloud servers using AMI's Linux and configuring the servers for specified applications.
• Setup and launching amazon Linux and RHEL EC2 instances, network interface with elastic IP's.
• Attaching or Detaching EBS volume to AWS EC2 instance.
• Resizing the EBS Volume on Linux servers.
• Creating/managing Ami/snapshots/volumes, upgrade/downgrade Aws resources (CPU, Memory, EBS).
• Restoring the EC2 Instance from the AMI Backup.
• Converting normal disk into vxvm control again convert into normal disks.
• Converting disks into different formats.
• Creating different disk groups or adding disks to the existing disk group.
• Depend upon client request, creating and increasing the Veritas file systems.
• Creating sub-disks, plexes, logical volumes.
• Recover the volumes with bad disk replacement.
• Deporting & importing of disk groups on shared nodes.
• Monitoring knowledge of cluster services.
• Checking status of the cluster.
• Starting and stopping the veritas cluster services.
• Troubleshooting vcs start-up, service groups and resources problems.
• Freezing service groups and unfreeze service groups.
• Bringing service group/resource group online and offline.
• Administering dependencies in failover and parallel service groups.
• Switching service groups in vcs during the maintenance.
• Check the engine logs for any messages related cluster.
• Managing Virtualization Environment using VMware ESXi 5.5, 6.0, 6.5 & 6.7 VSphere, VCenter.
• Migration of VM using Vmotion and performing Snapshots, Cloning.
• Creating and Managing Virtual Machines and Templates.
• Creating/Extending Data Stores in a cluster node.
• Installing & upgrading VMware tools on Virtual machines.
• ESXi host installation/Upgrade.
• ESXi host adding in a cluster node.
• Enabling HA & DRS on Cluster nodes.
• ESXi node HBA driver & Firmware upgrade.
• Excellent knowledge of clustering & high availability.

• RedHat Certified Engineer.
• AWS Certified Solutions Architect – Associate
• Azure Administrator Associate