Summary
Overview
Work History
Education
Skills
Training Attended.
Personal Information
Projects
Certification
Timeline
Generic
Raghunandan Keluskar

Raghunandan Keluskar

Senior System Administrator (Linux)
India (Mumbai),MH

Summary

Skilled and certified Unix/Linux System Administrator with 6.5 years of experience in IT infrastructure, including over 5 years of hands-on experience in administering Unix environments (RHEL, CentOS, and AIX). Proven track record in the installation, configuration, and maintenance of Unix/Linux servers, managing user accounts, file systems, network services, and implementing system-level security hardening. Skilled in system performance tuning, patch management, security hardening, and automation of routine administrative tasks. Known for a proactive and analytical approach to resolving complex technical issues and ensuring system availability. Adept at working in cross-functional teams, supporting global operations, and delivering reliable, high-quality infrastructure support.

Overview

7
7
years of professional experience
2
2
Certification

Work History

Senior Technical Analyst

Hexaware Technologies
Mumbai
03.2022 - Current
  • Worked as a Senior Systems Admin in the Linux team and provided L1 and L2 support for the Linux/Unix environment.
  • Support the client with their daily Linux operations, including participating in daily meetings regarding ticketing with both the team and the client.
  • I oversee Linux system operations, including software installations, upgrades, user account management, and handle network configurations. My tasks involve performance monitoring, issue resolution, patch management, and addressing security vulnerabilities.
  • Working on monitoring alerts on resource utilization, such as disk space utilization, CPU utilization, and memory utilization for Linux servers.
  • Support users in a timely manner, and ensure daily operational tasks are performed efficiently.
  • Managed user accounts, groups, and permissions on Linux systems.
  • Maintaining scheduled jobs through CRON.
  • Working on server upgradation (RHEL 7 to RHEL 8).
  • Manage backup for Linux servers as per user requests.
  • Using LVM for dynamically creating and extending partition sizes as per customers' requirements.
  • Troubleshooting the issues related to the performance of the OS.
  • EC2 instance setup with Amazon Linux OS, security groups.
  • Responsible for creating AWS IAM users, policies, groups, etc.
  • Implementing security groups for inbound/outbound access.
  • Applied OS patches and updates to maintain system security and stability.
  • Resolving incidents, changes, problem management, and user-generated requests and queries.
  • Conducting daily meetings with teams to discuss ongoing issues, and documenting the same.
  • Documented procedures and configurations for reference and knowledge sharing.

System Administrator

Monalisa EDC Pvt ltd
09.2021 - 02.2022
  • Involved in daily incident management and resolved the day-to-day problems raised by the users
  • Day to day monitoring of system logs, user usage of system resources, CPU and memory utilization
  • Managing patching and server hardening
  • Performed troubleshooting existing users accounts
  • Health checkup of Linux Servers
  • Troubleshooting the issues related to Performance of OS
  • Management of NFS server/client between LINUX servers
  • Creation of Symlink and Hardlink
  • File copy from one host to another using SCP
  • Server performance and Monitoring
  • Backing up Server data using Zip, tar, gzip, rsync
  • Worked of vi Linux editor.

Senior System Engineer

Aspire Nxt Pvt Ltd.
01.2020 - 09.2021
  • Worked as Linux L1 Support Engineer and Supported the Producation environment for L1 related issues
  • Managing and maintaining a data center with 50 Linux servers
  • Monitor and check network connectivity and work with network and dc team to resolve any issues in network, server at user end
  • Servers Installation (RHEL 6, ubantu)
  • Monitoring logs and alerts & Health checkup of Linux Servers
  • Installing packages through RPM, YUM
  • Setting up new accounts and password reset
  • Health checkup of Linux Servers
  • Working with ticketing tool(SNOW) and escalate to L2 team if not resolved
  • Performances Monitoring and Managing the Linux servers
  • Creates, changes, and deletes user accounts per request
  • Monitoring of logs and alerts
  • Creating ticket and escalate to concern team.

System Associate

Reliance Retail
12.2018 - 01.2020
  • Monitoring logs and alerts & Health checkup of Linux Servers.
  • Installing packages through RPM, YUM.
  • Setting up new accounts and password reset.
  • Health checkup of Linux Servers.
  • Working with ticketing tool(SNOW) and escalate to L2 team if not resolved.
  • Performances Monitoring and Managing the Linux servers.
  • Creates, changes, and deletes user accounts per request
    Monitoring of logs and alerts.
  • Creating ticket and escalate to concern team.

Education

Graduation, B.Sc( Computers ) -

National College of Education, Kalinga University
01.2022

Computer Engineering Technology

Maharashtra State Board of Technical Education
01.2017

Skills

  • OS administration (RHEL, CentOS, UNIX, AIX): installation, configuration, troubleshooting
  • User profiles, and group management
  • File permission management
  • LVM management
  • Patch management
  • Process management
  • Task Scheduler - crontab
  • Backup and recovery: FTP, NFS, Rsync
  • Filesystem management
  • Firewall management
  • Knowledge of basic shell scripting (Bash)
  • Networking: TCP/IP, DNS, DHCP
  • Virtualization: VMware, Vspare
  • Server monitoring - Nagios, Grafana
  • Cloud Support (AWS): EC2, SNS, CloudWatch, IAM
  • Ticketing tool: ServiceNow, EverstPortal, Newrelic
  • IT infrastructure support

Training Attended.

Training from Hexaware (Hexavarsity)

  • VMware vSphere 8
  • Linux administration
  • PAAS, AWS
  • Docker basics
  • AWS Cloud Practitioner Essentials

Certification from Udemy

  • ServiceNow ITSM processes
  • Linux Red Hat Certified System Administrator (RHCSA - EX200)
  • Cloud Computing for Beginners: Infrastructure as a Service
  • Cisco - TCP/IP and OSI Network Architecture Models
  • AIX Administration for Absolute Beginners
  • Server virtualization with Hyper-V and System Center
  • Python
  • Amazon VPC (Virtual Private Cloud) – AWS
  • Administering VMware vSphere 8 (Learn, Setup ESXi, and vCenter)
  • AWS Cloud Security: Learn to protect and defend your resources
  • AWS Cloud Migration
  • [NEW] Red Hat Training and Certification - RHEL 9 (RH124)
  • AWS Identity and Access Management (IAM) Foundations
  • DevOps, CI/CD (Continuous Integration/Delivery) for Beginners
  • CompTIA A+ 220-1101 Core 1 Hands-On Course, Full Training

Personal Information

Projects

PRJ-9378-vontier_infra and Digital _FPP_IMS_M&C, 31 Days, Worked as System support engineer to handling L1 and L2 related Linux servers issue. managing EMEA sites(UK, Sweden, South Africa, Germany, Italy, Finland, Denmark). Responsible for support for 500+ Linux servers.

Certification

  • Red Hat Certified System Administrator (RHCSA)

Red Hat certification ID: 250-083-797

  • AWS Certified Solutions Architect – Associate

Credential ID: EBEON1023851032

Timeline

Senior Technical Analyst

Hexaware Technologies
03.2022 - Current

System Administrator

Monalisa EDC Pvt ltd
09.2021 - 02.2022

Senior System Engineer

Aspire Nxt Pvt Ltd.
01.2020 - 09.2021

System Associate

Reliance Retail
12.2018 - 01.2020

Graduation, B.Sc( Computers ) -

National College of Education, Kalinga University

Computer Engineering Technology

Maharashtra State Board of Technical Education

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