Kris Renganathan
Senior System Administrator (Linux And UNIX)
Irving,Texas
Summary
Certified Professional highly successful having more than 15+ years of experience in System administration with expertise in conceptualization, planning, design, Security, implementation, production support and maintenance in the following areas: (i) Linux (RHEL & Centos) Unix (Solaris, AIX) and windows Computing Environment facilitating, Client-Server applications – Hardware, Virtualization (VMWARE-esxi), Operating Systems and Systems Software. (ii) High availability environment with RAC 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 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. (vii) Sound people leadership and teambuilding skills (viii) 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.
Overview
27
27
years of professional experience
5
5
Certifications
Work History
Senior system Engineer – Linux Lead
Choreograph
02.2019 - Current
- Managed a fleet of 3600 Linux servers, ensuring optimal performance and uptime using redhat satellite server.
- Periodical analysis of the Linux servers for, system bottlenecks and performance and implementing remedial measures using custom scripts.
- Automated system deployments using Ansible, reducing setup time by 70%, the same ansible used for security policy implementation remediate security vulnerabilities and monthly patching from RHEL satellite server 6.14.
- Configured new builds as per project specifications and enforcing security polices as per company security policies.
- Responsible for Change control activities for all teams and follow up with their proper implementation procedure and analysing the risks involved , security polices and client’s approval
- Led a migration project from solaris and old versions of rhel to rhel8 achieving optimum performance as per app & reduced vulnerabilities.
- Virtualized physical servers using VMware, reducing hardware costs and improving resource utilization.
- Collaborated with Hadoop, 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
- Monitored system performance and application health using Nagios (opsview), minimizing downtime.
- Designed and Implemented native SSSD for RHEL server logins on via windows AD and open ldap for unix servers.
- Resolved complex technical and hardware issues by collaborating with cross-functional teams, vendor support (redhat, oracle and netbackup, etc.,) and conducting root cause analysis.
Senior Infrastructure Administrator (Linux)
ESSILOR USA
08.2016 - 12.2018
- As a Senior Linux administrator responsible for build, patch, configure and upgrade highly precession lens corrective application Optifacts 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 7.
- Apart from build, configured servers for Vlan, networking, mail, custom libs, application specific rpms and monitoring (Solarwinds and NagiosX1)
- Works with DBA (Informix and oracle), Application and Development groups to coordinate, resolve, and/or implement solutions to new or existing problems
- Co-ordinate for application patch and releases along with developers and scientists.
- Have worked in close co-ordination with auditors for PCI & SOX compliance strategy implemented in OS, DB and Applications (Optifacts, 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.
- Involved in week end and off hour changes with proper change management policies.
STS Operations Team Lead (UNIX)
EPSILON
02.2012 - 08.2016
- Worked as an operations lead responsible for Maintaining hardware and administering (Day today administrations) more than 2000+ servers and 1000+ VMs of different vendor flavours of HP, DELL, ORACLE,ESXI ,OVM &NETEZZA.
- Quarterly patching upgrading server firmware and bios with proper change management process. Negotiated and implemented a maintenance window for maintenance activities with different LOB (DB , Apps and Security)for automated pre-scheduled patching events.
- Provided 24 x7 production support to develop, update, support and maintain for key infrastructure services and subject matter expert in Linux and Unix systems for.
- Advised/Managed large/enterprise projects, like… Automation of existing Service applications, data & datacentre migrations, enterprise wide provisioning of servers across multiple platform 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 administration by maintaining proper network VLAN and subnet segmentation and troubleshooting various
- 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.
- Creating RCA, once troubleshooting for apps failures, auto reboot, hardware and network issues.
- Server upgrade from Old RHEL versions to RHEL7 and along with proper app libs.
Senior Systems Engineer (Consultant)
DYNAMEX
11.2010 - 02.2012
- 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)
FIRSTDATA CORPORATION
09.2008 - 10.2010
- 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.
- Configuring distributed file systems and administering NFS server and NFS clients and editing auto-mounting mapping as per system / user requirements on Unix/Linux.
- 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 dmp, 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.
- Plan, Implement and Create proper user, application dynamic and static device groups for easy Opsware administration.
Senior UNIX Implementation Engineer
JP Morgan Chase
01.2004 - 08.2008
- As a Senior UNIX SA in CTRBS solely responsible for GFT- Hardware refresh and DC migration, involved in the following activities.
- Consolidated 140 midrange servers (E420R/220R/450/3500) from Solaris 6/8/9 OS to 97 Solaris 10 servers with new
- Installed and deployed Opsware SAS 6.x agents, registering H/W and S/W to respective Data center Opsware Cores
- Created ECM as per server’s maintenance window and informing the impacted groups.
- Following things done in the process of post build tasks on Solaris and Linux servers:
- Patch and OBP Upgrade to the latest JPMC Certified Patch Set (2008-07)
Sr. UNIX System Administrator and Team Lead
Qwest Communications
02.1999 - 12.2003
- Unix Team Lead in an Enterprise environment of 300+ servers managing a team of 12 Unix System Administrators.
- DNS DR (disaster recovery) site implementation and testing. This task involved implementation of a disaster recovery site for redundancy.
Education
Master of Engineering (MS) - Electrical and Electronics
Bachelor of Engineering (BS) - Electronics and Communications
Skills
RHEL and GCP Certified
Project, Team and System Management
Capacity Planning & Disaster Recovery
System Performance and Security Monitoring
Network vulnerability remediation for SOX and PCI compliance using Nexpose
Installed ,configured and maintained Redhat satellite 614 with 6000 clients
Expertise in patching , upgrade, Implementation and Delivery life cycle process
DB, App Configuration and tuning along with DBA and web apps
24 x 7 Production support experience
Incident, Problem Management and Error remediation
Vendor coordination for Oracle (Exadata and OVM), HP, VMware and Dell hardware
Scripting using shell and Yaml
Knowledge in OLTP and OLAP (in memory DBs)
App co-ordination for devops (GIT, Jenkins, Docker, Puppet, Nagios Ansible and Kafka)
Devops app install like kubernates, openshift, kafka and hadoop
Unix Security (VAS & KEON) , SSSD (RHEL)
HP-SAS (Opsware) and Blade Logic
Oracle 10/11g/12c/19c/OEL with ASM and RAC support, tuning, ASM and GFS
Data center migration,consolidationand data transfer from local nas to remote using mule and VVR
TCP/IP, Ethernet and VMware exi version 67
Hitachi-SAN, NAS & Fusion IO Configuration and management on RHEL and ORACLE Linux servers
Good Experience with system Hardening and upgrade RHEL 7,8 and 9 using leapp
Off-shore Team Management
Change assessment, tracking and impact analysis
Hadoop server cluster HW management
Mid-level python scripting
Root-cause analysis
Linux and unix administration
FS and Secure logging for NFS, ZFS using AD and LDAP
Requirements gathering
Troubleshooting
Network administration
Standard operating procedures
Storage area networks
Infrastructure management
Design and implementation
Complex project delivery
Skilled in hp and Dell Hardware maintenance
Working knowledge in kubernetes and Redhat openshift and
Database co-ordination for patching (oracle and exadata)
Software development experience
Proficient in redhat satellite 615 and ansible
Organizational improvement
Containerization technologies
Project management
Continuous integration tools
ITIL framework
Change management processes
IT service management
Infrastructure support
Change control documentation
Cybersecurity frameworks
Troubleshooting and analysis
Advanced troubleshooting
SOP creation
Requirement documentation
System troubleshooting
Technical support for developers and app owners
Redhat insight for security vulnerablities
Documentation protocol design
Hardware and software installation
User support (creation, modfication and assigning ACL and sudo)
Information security
Network security with Firewalls( regular ,dmz and netscaler)
Performance tuning
Infrastructure development
Virtualization
Hardware integration with servers and Storage (Hitachi &EMC)
Linux certification
Systems analysis
Regression test management
Infrastructure tracking
TCP/IP protocol
Knowledge Cloud computing
Configuration management
Certification
GCP Associate Cloud engineer ( certid bGY0AQ)
Timeline
RHCE Certified for version 8
11-2025
GCP Prof . cloud Architect (certid m0DGyd)
08-2025
GCP Associate Cloud engineer ( certid bGY0AQ)
07-2022
RHEL Satellite Training from REDHAT
07-2021
Senior system Engineer – Linux Lead
Choreograph
02.2019 - Current
Senior Infrastructure Administrator (Linux)
ESSILOR USA
08.2016 - 12.2018
STS Operations Team Lead (UNIX)
EPSILON
02.2012 - 08.2016
Senior Systems Engineer (Consultant)
DYNAMEX
11.2010 - 02.2012
Senior Systems Engineer (Lead)
FIRSTDATA CORPORATION
09.2008 - 10.2010
Senior UNIX Implementation Engineer
JP Morgan Chase
01.2004 - 08.2008
Sun certified Soalris engineer (version solaris 7)
03-2001
Sr. UNIX System Administrator and Team Lead
Qwest Communications
02.1999 - 12.2003