System Administrator Red Hat

Radhakrishnan Renganathan

Infrastructure Solutions Engineer

https://www.linkedin.com/in/radhakrishnan-renganathan-a426a510/

Summary

Dedicated and skilled Red Hat System Administrator with 15+ years of experience in managing and deploying Linux systems. Proficient in system installation, configuration, and troubleshooting. Seeking to leverage expertise in a challenging role to support enterprise IT infrastructure. Planning, design, Build, Security, delivery, production support and maintenance in the following areas: (i) Linux (RHEL 6, 7 and 8, Rocky Linux &Centos) Unix (Solaris, AIX), Hands on experience on red hat satellite server 6.14 and windows Computing Environment facilitating, Client-Server applications – Hardware, Virtualization (VMWARE-ESXI), Operating Systems and Systems Software. (Ii) High availability environment with RAC and VCS cluster to run Oracle Databases .(iii) worked in demanding Financial, Health care and telecommunication environments requiring extremely high system availability in high-paced, high system load environment. (iV)Extensive knowledge of Business contingency planning, Disaster Recovery using VVR planning and Facility & Infrastructure Management, Information Security standards. (V) Excellent Team Player with strong interpersonal, communication, reliable, detail-oriented and multi-tasking. (Vi) Developed and maintained Dev, QA and production systems in accordance to business requirements and Industry best practices using Devops apps like ansible and CI/CD(viii) Collaborating with storage team and configuring storage clients(Hitachi and emc) storage on Linux and UNIX servers(iX)Proven ability to quickly sift through a complex problem to identify root cause and to implement solutions for mission critical issues with very strict service level agreements & ITIL certified. Strategic Senior REDHAT Systems Engineer with master’s degree and extensive systems configuration background. Managed design and implementation of *ux and completed project ahead of schedule.

Experience

Senior RHEL System/ Infrastructure Engineer Feb 2019 - Present

Choreograph, Richardson, TX

Managed a fleet of 3600 (including physical and virtual) Linux servers, ensuring optimal performance and uptime using red hat satellite server.

Periodical analysis of the Linux servers for system bottlenecks and performance and implementing remedial measures using custom ansible scripts.

Server build using various techniques through Redhat satellite 6.14 kick start, VMware gold image and using ansible to deploy uniform config across environments and configuring for secured login through Windows AD,SSSD using kdc,DUO and okta for dual authentication and authorization.

Data transfers between several applications using SFTP through Ldap logging with encryption and enterprise software VVR between various sites.

Maintained Redhat subscriptions for physical and virtual servers along with Redhat satellite server and upgrade the same for every 3 months.

Automated system deployments using Ansible, reducing setup time by 70%, the same ansible used for security policy implementation remediate security vulnerabilities Like IP and DNS config, SolarWinds and monthly patching from RHEL satellite server 6.14 for all linux and *ux servers.

Configured new DB and application builds as per project specifications and enforcing company and Redhat’s security polices (SSSD)as per company security policies.

Responsible for Change control activities for all teams and follow up with their proper implementation procedure and analyzing the risks involved, security policies and client's approval.

Led a migration project from Solaris and old versions of rhel to rhel8 (using red hat’s leapp) and created dev apps with open shift (red hat), Docker and Kubernetes with CI/CD,achieving optimum performance as per app & reduced vulnerabilities.

Virtualized physical servers using VMware and OpenShift, reducing hardware costs and improving resource utilization.

Collaborated with Hadoop, Application, dba, web and network team for Linux related issues like upgrade, ASM disk allocation, performance tuning) and web APP (SSL Certificate &PGP installation, SFTP) environments, load balancing on F5 and cisco with network team collaboration.

Designed and Implemented native SSSD for RHEL server logins on via windows AD and open ldap for Unix servers also implemented security vulnerability findings for servers using REDHAT’s insight application and tenable locally.

Due to Datacenter closure (on august 15, 2025) worked on Peta byte data transfer using FAS2720 (NetApps mule and VVR).

Resolved complex technical and hardware issues by collaborating with cross-functional teams, vendor support (red hat, oracle and NetBackup, etc.,) and conducting root cause analysis.

Senior Infrastructure Administrator (Linux) Aug 2016 – Dec 2018

ESSILOR USA, Carrollton, TX

As a Senior Linux administrator responsible for building, patch, configure and upgrade highly precession lens corrective application Opti facts and Tibco on RHEL 5,6 and 7.

Responsible for maintaining 1300 Linux VMS on VMWARE 5.x and 6.0.2.

Installed and configured RHEL6.0.2 satellite servers both in DMZ and non-DMZ zones along with Foreman on CENTOS (for dev environment).

Designed and implemented highly secured SFTP environment with chroot environment on RHEL7.

Responsible for system upgrades from older versions of RHEL (5 and 6) to RHEL 7and played a key role in designing and testing data center disaster recovery strategies.

Works with DBA (Informix and oracle), Application and Development groups to coordinate, resolve, and/or implement solutions to new or existing problems

Have worked in close co-ordination with auditors for PCI & SOX compliance strategy implemented in OS, DB and Applications (Opti facts, MQ, Tibco and Mail).

Created Dev oracle standalone servers and vagrant boxes (for Docker images) using OVM and export/import tested servers to VMWARE ESXI.

Co-ordinated with storage team for Nas and disk allocation and configuration.

STS Operations Team Lead (UNIX) Feb 2012 – Aug 2016

EPSILON, Irving, TX

Worked as an operations lead responsible for Maintaining hardware and administering (Day today administrations) more than 2000+ servers and 1000+ VMs of different vendor flavors of HP, DELL, ORACLE,ESXI,OVM &NETEZZA.

Provisioning of servers across multiple platforms and application rollouts, hardware refresh, OS conversion with the team of 15+ engineers/architects/developers, with respect to their LOB.

Fully Supported Big data, Hadoop and Casandra team for their code deployment, maintain their HW (DELL R servers), patching (using ansible).

Network related issues by using tools such as ping, netstat, traceroute, tcpdump, etc., to track the LLDP, NFS, VLAN, Subnet and gateway info

Configuration of VAS (Vintela Authentication Services) for SSO authentication with Active directory and KDC.

Lead a team that are geographically dispersed and the single point of contact for P1 and P2 tickets and acted as a resource for colleagues with less experience and took on a lead role with regard to certain aspects of projects.

Senior Systems Engineer (Consultant) Nov 2010 – Feb 2012

DYNAMEX, Dallas, TX

Responsible for approximately 200 Enterprise Linux servers, which act as the platform for Oracle Database and Financials applications, Dynamex websites as well as several other Tomcat/J2EE servers to name a few. These responsibilities include engineering and supporting Clarion storage systems utilizing Fiber Channel, utilizing F5 load balancers, and VMware-based virtualized Linux servers.

Installed, configured and implemented 3rd party and in-house (custom) applications as per frequent code change.

Documenting day-to-day problems (FAQs), major configuration changes and system architecture changes.

Senior Systems Engineer (Lead) Sep 2008 – Oct 2010

FIRSTDATA CORPORATION, Dallas, TX

Installed, configured and administered Unix-Solaris 10(Jumpstart) and Linux-RHEL (Kickstart with net and PXE boot) servers with latest patches and FDC's standard Monitoring and middleware tools for standalone & cost-effective Solaris LDOMS, Zones (container) with (ZPOOLS) ZFS and with Virtual x86 Linux with VMware tools.

Coordinated with DBA, Storage, Web, Application, Site engineering, Network, Security and Vendors team to resolve bottlenecks like system & network tuning, h/w issues, data migration from old servers, SAN Lun (using native rhel dump, Leadville drivers and VERITAS DMP) allocation and security issues using standard OS and customized procedures.

As a prime administrator, maintained 4 core Opsware (HPSA) servers and a lab server with 2580 clients which includes Solaris, AIX, Linux and ESX.

Additional Experience

Unix Implementation Engineer Jan 2004 – Aug 2008

Chase, Columbus, OH

Education

Master of Engineering (MS): Electrical and Electronics

Madurai Kamaraj University - Madurai, India Dec 1985

Bachelor of Engineering (BS): Electronics and Communications

Madurai Kamaraj University - Karaikudi, India Jul 1984

Certifications

GCP Associate Cloud engineer ( certified bGY0AQ)

GCP Professional cloud Architect (certified m0DGyd)

RHEL Satellite Training from REDHAT

RHCE Certified for version 8

Sun certified Solaris engineer (version Solaris 7)

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