Summary
Overview
Work History
Education
Skills
Certification
Experience Summary
Timeline
Generic

Sagar Kodurupaka

Summary

Over 13+ years of IT experience and Linux Systems Administrator with 8 years of experience in optimizing and managing Linux infrastructures.

Overview

13
13
years of professional experience
1
1
Certification

Work History

Unix/Linux Administrator

Blue Shield of California
04.2024 - Current
  • Collaborated for RHEL7 to 8 uplift migration projects.
  • Worked on complete infra structure middleware server’s setup from end to end as part of migration.
  • Security hardening done for all DB passwords in liberty servers with AES encryption.
  • Worked on Installation and configuration of Redhat Linux 4/5/6/7, CentOS 4/5/6.x, Solaris 9/10 servers on large distributed environment.
  • Worked on Vblock Infrastructure to perform Virtualization using VMWare ESX, vSphere on RHEL servers.
  • Worked on Installation of VMware ESX and creating virtual machines from scratch and assisted in troubleshooting applications for load balancing.
  • Deployed and configured automation tools like puppet, Blade logic, Ansible and Chef.
  • Worked on tools like TCPDUMP, NMAP, analyzing TCP, SSL Handshakes.
  • Configured various network services such as LDAP, NFS, NIS, DNS.
  • Experience managing NFS shares and file systems from NetApp filers and EMC NAS devices.
  • Managing systems routine backup, scheduling jobs like disabling and enabling cron jobs, enabling system logging, network logging of servers for maintenance, performance tuning, testing.
  • Applying OS patches and upgrades regularly, maintain administrative tools and utilities.
  • Troubleshoot and resolve hardware, software and network issues.
  • Enrolling users and maintaining system security.
  • Collaborate with development and DevOps teams to support application deployment and infrastructure needs.
  • Collaborated with network team for new set of DNS changes as part of Migration.
  • Participated in capacity planning, patching, upgrades, security hardening and refresh planning.
  • Maintain physical linux infrastructure, attached storage and other components.
  • Creating the requests for network team and follow up on the firewall request access for new servers.
  • Performing build upgrades, patching, security vulnerability fixes.
  • Configuring the App Dynamics tool for monitoring the application health and alerts.
  • Worked on auto stop/start up scripts.
  • Creating the package and deploying the snapshot using Urban code deployment tool for one of the applications.
  • Secured applications by configuring Windows Authentication, IP restrictions, and applying web.config rules for content access and redirection.
  • Client: Blue Shield of California – 04/2024 to Till Date
  • Role: Unix/Linux Administrator.

System Administrator (NAMS Region)

Citi Bank
10.2023 - 03.2024
  • Analyzes and resolves problems associated with the operating system’s servers, hardware, applications and software.
  • Monitors systems performance and ensures compliance with security standards.
  • Monitors everyday systems, evaluates availability of all server resources and performs all activities for linux servers.
  • Performing automation for repeated operations activities using tools like GitHub and Ansible.
  • Worked on Installation and configuration of Redhat Linux 4/5/6/7 servers on large distributed environment.
  • Worked on configuring Puppet master servers and installing Puppet client or linux servers.
  • Configured Redhat Linux servers for production, staging and test environments running Database and Middleware applications.
  • Configured, Maintained, Installed OEL.
  • Installation, configuration and administration of VMWAREIBM Blade servers.
  • Experience working with production servers at multiple data centers.
  • Installed checkpoint firewall to secure networks.
  • Diagnosing failed disk drives using shell scripting for automated tasks.
  • Logged events from forced crash dumps and troubleshooted server issues.
  • Configured yum repository server for installing packages from a centralized server.
  • Experience with system imaging tools clonezilla and system imager for data center migration.
  • Installed and configured DCHP server to give IP leases to production servers.
  • Performing the BAU Activities.
  • Supported as 24x7 shift basis with on call support on weekends.
  • Supported production changes on weekends without any escalations.
  • TCS / Client: Citi Bank – 10/2023 to 03/2024
  • Role: System Administrator (NAMS Region)

Unix/Linux Administrator

Next Era Energy (Florida Power & Light)
01.2023 - 10.2023
  • Installed, Configured and Maintained Redhat servers at multiple data centers.
  • Management of Redhat Linux user accounts, groups, directories and file permissions.
  • Applied the cluster topology that meets high availability and failover requirement for performance and functionality.
  • Configured managed ESX VM’s with virtual center and VI client.
  • Installed packages with yum and rpm.
  • Performed Disk management with the help of LVM Logical Volume Manager.
  • Created and maintained network users, user environment, directories and security.
  • Documented the steps involved for data migration on production servers and also testing procedures before the migration.
  • Provide the support of building the server, patching, user administration tasks, deployment, software installation, performance tuning and troubleshooting.
  • Regular maintenance of Veritas cluster, MC/Service guard packages and load balancing.
  • Administration and configuration in Veritas volume manager/veritas file system.
  • Experience in LPAR knowledge on creating Dynamic LPAR’S and created WPAR on AIX.
  • Configure HACMP for a clustering environment on AIX servers and administered the virtualization environments consisting VIO servers.
  • Administered the unix/linux system for clusters HP servers with fiber attached SAN storage.
  • Maintained troubleshooted SAN and Fibre card related errors on unix.
  • Performed daily backups, restoration of data as per requests from developers using VeritasNetbackup.
  • Created users, manage user permissions, maintain user file system quota on Redhat Linux and AIX.
  • Implementing RAID1 and RAID 5 on mission critical servers such as domain controllers and file servers.
  • Performed installation, periodic maintenance updates and applied APAR fixes on linux and AIX servers.
  • Responsible for backup of all servers and recovery of all servers.
  • Installing or applying latest fix pack upgrades.
  • Supporting BAU activities and on call support for weekends.
  • CTS / Client: Next Era Energy (Florida Power & Light) – 01/2023 to 10/2023
  • Role: Unix/Linux Administrator.

Unix/Linux Administrator

Blue Shield of California
03.2019 - 12.2022
  • Worked on complete infra structure middleware server’s setup from end to end as part of migration.
  • Security hardening done for all DB passwords in liberty servers with AES encryption.
  • Worked on Installation and configuration of Redhat Linux 4/5/6/7, CentOS 4/5/6.x, Solaris 9/10 servers on large distributed environment.
  • Worked on Vblock Infrastructure to perform Virtualization using VMWare ESX, vSphere on RHEL servers.
  • Worked on Installation of VMware ESX and creating virtual machines from scratch and assisted in troubleshooting applications for load balancing.
  • Deployed and configured automation tools like puppet, Blade logic, Ansible and Chef.
  • Worked on tools like TCPDUMP, NMAP, analyzing TCP, SSL Handshakes.
  • Configured various network services such as LDAP, NFS, NIS, DNS.
  • Experience managing NFS shares and file systems from NetApp filers and EMC NAS devices.
  • Managing systems routine backup, scheduling jobs like disabling and enabling cron jobs, enabling system logging, network logging of servers for maintenance, performance tuning, testing.
  • Applying OS patches and upgrades regularly, maintain administrative tools and utilities.
  • Troubleshoot and resolve hardware, software and network issues.
  • Enrolling users and maintaining system security.
  • Collaborate with development and DevOps teams to support application deployment and infrastructure needs.
  • Collaborated with network team for new set of DNS changes as part of Migration.
  • Participated in capacity planning, patching, upgrades, security hardening and refresh planning.
  • Maintain physical linux infrastructure, attached storage and other components.
  • Creating the requests for network team and follow up on the firewall request access for new servers.
  • Performing build upgrades, patching, security vulnerability fixes.
  • Configuring the App Dynamics tool for monitoring the application health and alerts.
  • Worked on auto stop/start up scripts.
  • Creating the package and deploying the snapshot using Urban code deployment tool for one of the applications.
  • Secured applications by configuring Windows Authentication, IP restrictions, and applying web.config rules for content access and redirection.
  • CTS / Client: Blue Shield of California – 03/2019 to 12/2022
  • Role: Unix/Linux Administrator.

Unix/Linux Administrator

Wells Fargo Bank
01.2017 - 02.2019
  • Installed, Configured and Maintained Redhat servers at multiple data centers.
  • Management of Redhat Linux user accounts, groups, directories and file permissions.
  • Applied the cluster topology that meets high availability and failover requirement for performance and functionality.
  • Configured managed ESX VM’s with virtual center and VI client.
  • Installed packages with yum and rpm.
  • Performed Disk management with the help of LVM Logical Volume Manager.
  • Created and maintained network users, user environment, directories and security.
  • Documented the steps involved for data migration on production servers and also testing procedures before the migration.
  • Provide the support of building the server, patching, user administration tasks, deployment, software installation, performance tuning and troubleshooting.
  • Regular maintenance of Veritas cluster, MC/Service guard packages and load balancing.
  • Administration and configuration in Veritas volume manager/veritas file system.
  • Experience in LPAR knowledge on creating Dynamic LPAR’S and created WPAR on AIX.
  • Configure HACMP for a clustering environment on AIX servers and administered the virtualization environments consisting VIO servers.
  • Administered the unix/linux system for clusters HP servers with fiber attached SAN storage.
  • Maintained troubleshooted SAN and Fibre card related errors on unix.
  • Performed daily backups, restoration of data as per requests from developers using VeritasNetbackup.
  • Created users, manage user permissions, maintain user file system quota on Redhat Linux and AIX.
  • Implementing RAID1 and RAID 5 on mission critical servers such as domain controllers and file servers.
  • Performed installation, periodic maintenance updates and applied APAR fixes on linux and AIX servers.
  • Responsible for backup of all servers and recovery of all servers.
  • Installing or applying latest fix pack upgrades.
  • Supporting BAU activities and on call support for weekends.
  • CTS / Client: Wells Fargo Bank – 01/2017 to 02/2019
  • Role: Unix/Linux Administrator

System Administrator

Deluxe Staff Augmentation
06.2016 - 12.2017
  • Analyzes and resolves problems associated with the operating system’s servers, hardware, applications and software.
  • Monitors systems performance and ensures compliance with security standards.
  • Monitors everyday systems, evaluates availability of all server resources and performs all activities for linux servers.
  • Performing automation for repeated operations activities using tools like GitHub and Ansible.
  • Worked on Installation and configuration of Redhat Linux 4/5/6/7 servers on large distributed environment.
  • Worked on configuring Puppet master servers and installing Puppet client or linux servers.
  • Configured Redhat Linux servers for production, staging and test environments running Database and Middleware applications.
  • Configured, Maintained, Installed OEL.
  • Installation, configuration and administration of VMWAREIBM Blade servers.
  • Experience working with production servers at multiple data centers.
  • Installed checkpoint firewall to secure networks.
  • Diagnosing failed disk drives using shell scripting for automated tasks.
  • Logged events from forced crash dumps and troubleshooted server issues.
  • Configured yum repository server for installing packages from a centralized server.
  • Experience with system imaging tools clonezilla and system imager for data center migration.
  • Installed and configured DCHP server to give IP leases to production servers.
  • Performing the BAU Activities.
  • Supported as 24x7 shift basis with on call support on weekends.
  • Supported production changes on weekends without any escalations.
  • CTS / Client: Deluxe Staff Augmentation – 06/2016 to 12/2017
  • Role: System Administrator

WebSphere Administrator

Kaiser Permanente
08.2014 - 05.2016
  • Configuration of WebSphere Application Server to external database DB2
  • Installation, Configuring, Upgrading, and troubleshooting the WebSphere Application Server.
  • Responsible for deploying, monitoring application, log files and provided information to the developers.
  • Configured and Enabled the Global Security System for WAS Administration for Console users and Console Groups using Active Directory Server as a LDAP User Registry.
  • Deployment of EAR & WAR files on WebSphere Application Server and Network Deployment Manger.
  • Configured WebSphere resources like JDBC providers, JDBC data sources, connection pooling.
  • Experis IT / Client: Kaiser Permanente – 08/2014 to 05/2016
  • Role: WebSphere Administrator

Software Engineer

Smart Data Strategies
03.2012 - 07.2014
  • Configuration of WebSphere Application Server to external database DB2
  • Configuring Server for LDAP security.
  • Installation, Configuring, Upgrading, and troubleshooting the WebSphere Application Server.
  • Responsible for deploying, monitoring application, log files and provided information to the developers.
  • Configured and Enabled the Global Security System for WAS Administration for Console users and Console Groups using Active Directory Server as a LDAP User Registry.
  • Deployment of EAR & WAR files on WebSphere Application Server and Network Deployment Manger.
  • Configured WebSphere resources like JDBC providers, JDBC data sources, connection pooling.
  • Involved in Creating and Managing the Nodes, Application Server’s, and Clusters.
  • Trouble shooting various problems in different stages.
  • Enabling SSL Security in Web Environments for IBM HTTP Server & WebSphere application Server.
  • Responsible for setting up user access and set up control for specific resources.
  • IIC / Client: Smart Data Strategies – 03/2012 to 07/2014
  • Role: Software Engineer

Education

MCA -

Jawaharlal Nehru Technological University of Hyderabad
01.2010

Bsc - Computers

Kakatiya University Warangal
01.2007

Skills

  • Protocols: TCP/IP, SNMP, SMTP, HTTP, FTP, DNS, NIS, LDAP, SOAP
  • Web Servers: IBM HTTP Server, Apache
  • Database: SQL Server, DB2, Oracle and Mongo
  • Application Servers: IBM WebSphere Application Server, Portal, Jboss and Liberty Profile
  • Tools: Data Power, MQ, IIB(ACE)
  • Operating Systems: Red hat Linux 5/6/7, Windows, RHEL/CentOS 5x/6x/7, Ubuntu/Sun Solaris
  • Monitoring Tools: Dynatrace, App Dynamics and Splunk
  • Ticketing Tools: Jira, ServiceNow, BMC Remedy
  • Third-party: BigIPF5, UCD, APIGEE
  • Cloud: AWS, Azure and GCP
  • DevOps: Jenkins, OpenShift, Ansible and Git
  • Scripting: Shell Bash, Python
  • Version Control System: Bitbucket, GitHub and SVN

Certification

  • AWS Certified Solutions Architect
  • Red hat Certified System Administrator
  • IBM Certification of C9510 – 401 – IBM WebSphere Application server Network deployment V8.5.5, System Administration.

Experience Summary

  • Collaborated for RHEL7 to 8 uplift migration projects.
  • Collaborated with network team for new firewall access requests and DNS changes as part of RHEL7 to 8 uplifts.
  • Experience in installing and configuring of IBM WebSphere and Liberty Profile
  • Experience on solaris 10/9/8/7 and RHEL 6/7 implementation administration, installation and Maintenance.
  • Integration of various network related services like NFS, NIS, DNS, FPT and samba server.
  • Installation and configuration of Apache/web logic on solaris and linux.
  • Experience in Install and configure Linux operating systems (RHEL, CentOS, Ubuntu, Debian, etc.)
  • Experience in Partition disks, configure RAID, and file systems.
  • Worked on Create, delete, and manage user accounts and groups.
  • Setting up and managing user permissions, ownerships, and access control.
  • Strong technical background in storage, Disk Management, Logical volume management and logical partitioning.
  • Experience in Installation, configuration and maintenance of sun and hp servers.
  • Installation of SSL certificate on linux servers.
  • Managed and optimized Linux-based operating systems in both physical and virtual environments, ensuring high availability and performance.
  • Coordinated hardware and software upgrades, ensuring compliance with operational milestones while minimizing service interruptions.
  • Executed backup and recovery functions for Linux servers, ensuring data integrity and availability.
  • Conducted security compliance checks and implemented best practices to safeguard Linux server environments.
  • Managed cluster maintenance and job scheduling for optimal performance.
  • Performed regular system backups and disaster recovery planning.
  • Followed ITIL processes for standardized server builds and operations.
  • Participated in Design Review Meetings (DRM) prior to server builds.
  • Participated in capacity planning and resource allocation for Linux servers.
  • Configured and managed NFS mounts for centralized file storage, improving access times.
  • Developed automation scripts using shell and Python to streamline system administration tasks.
  • Configured and managed LDAP and Active Directory integrations.
  • Performed operating system and blade firmware patching to maintain system integrity and security.
  • Experience in configuring the Splunk and querying for retrieving the logs, which helps for trouble shooting.
  • Experience in configuring the App Dynamics and Dynatrace tool for monitoring the servers and application health.
  • Supporting and coordinating with developers and scrm team for infra releases and Bi-weekly digital releases.
  • Experience on Bitbucket and Jenkins for application deployments and liberty configurations.
  • Experience on troubleshooting the issues within the SLA.
  • Good experience on closing the incidents, Jira tickets, changes, and problem tickets within the SLA
  • Worked on clean-up activities.
  • Scheduled cronjobs in servers for daily restart of servers as per the requirement.
  • Experience in scheduling the cronjobs for logs clean-up activities to remediate the disk space issues.

Timeline

Unix/Linux Administrator

Blue Shield of California
04.2024 - Current

System Administrator (NAMS Region)

Citi Bank
10.2023 - 03.2024

Unix/Linux Administrator

Next Era Energy (Florida Power & Light)
01.2023 - 10.2023

Unix/Linux Administrator

Blue Shield of California
03.2019 - 12.2022

Unix/Linux Administrator

Wells Fargo Bank
01.2017 - 02.2019

System Administrator

Deluxe Staff Augmentation
06.2016 - 12.2017

WebSphere Administrator

Kaiser Permanente
08.2014 - 05.2016

Software Engineer

Smart Data Strategies
03.2012 - 07.2014

Bsc - Computers

Kakatiya University Warangal

MCA -

Jawaharlal Nehru Technological University of Hyderabad

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