Linux Administrator

Sasi Koganti

email: ****.***@*****.***

phone # 937-***-****

SUMMARY:

. Over 8 years of professional experience in Linux/Unix Administration

. Experience in Installation, Configuration, Upgradation, Support &

Maintenance of RedHat Enterprise Linux and Sun Solaris servers

. Experience in implementing Virtualization using VMware ESX

. Experience in building Servers using Kickstart for Linux, Jumpstart

for Solaris

. Experience in RPM Package Administration for installing, upgrading,

and checking dependencies in RedHat

. Extensive administration experience in Storage Area Network (SAN) and

Network Attached Storage (NAS)

. Good experience in setting up RAID0, RAID0+1 and RAID5 for data

redundancy

. Experience in Veritas NetBackup with proficiency in System Backup and

Recovery from tapes

. Experience and implementation of services like NFS, NIS, NIS+, DNS,

DHCP, LDAP, Mail servers and Samba servers

. Responsible for creating, configuring and maintaining Zones and

installing applications on individual zones (Global & Local zones)

. Experience in implementing and configuring of Logical Volume Manager

(LVM), Solaris Volume Manager (SVM), Veritas Volume Manager (VxVM)

. Responsible for setting up Disaster Recovery environment for Linux

servers and implemented all the DR procedures as per the guidelines

. Experience in Performance Monitoring of Kernel parameters, Memory,

Disks, Network

. Knowledge in configuring disks in EMC & Hitachi SAN environment

including checking SAN visibility & multipathing

. Expertise in setting up SSH, SCP, SFTP connectivity between Unix hosts

. Expertise in configuring Bonding in Linux and IPMP in Solaris

. Creating and maintaining user accounts, permissions, disk space and

process monitoring

. Proficient in installation and configuration of Web Sphere

Applications on Linux

. Good exposure to Datacenter environment

TECHNICAL SKILLS:

Operating Systems: RedHat Enterprise Linux, Sun Solaris, CentOS, Fedora,

SLES, Ubuntu, Windows

Hardware: HP ProLiant DL160/DL185/DL585/DL580/DL360/BL 460, Dell Power Edge

2400, 2450, 2850, 2950, Sun Netra Servers, SunFire

V210/V240/V440/V480/ V880 Sun Enterprise

E6900/15k/25k/M5k

Languages: C, C++, HTML, KSH, CSH, Bash

Networking: TCP/IP, NFS, Telnet, FTP, DNS, DHCP, NAT,

ifconfig, route, Netstat, HTTP,

SAMBA

Web Servers: Apache, Tomcat, Jboss, WebLogic & Web Sphere

Security: SUDO, SSH, SSL

Tools: Veritas Volume Manager, Veritas Cluster

Server (VCS), Veritas Netbackup Solstice Disk Suite, VMware

ESXi, Virtual ticket, Virtual Request, Infoman, ServiceNow,

ResolveIT, Putty, Reflection, QIP

PROFESSIONAL EXPERIENCE:

Epsilon Oct 2014 - Till Date

Irving, TX

Sr. Linux Administrator

. Worked on projects based of Client requirements which involved Unica,

ETL, Web, Oracle DB standalone & Oracle RAC cluster installations on

RHEL

. Involved in day-to-day project meetings with PMO's and Client teams to

ensure project deadlines were met

. Configured kickstart server and updating/applying kernel patches to

servers using RedHat Satellite server

. Worked closely with DataCenter facilities team to rack & stack new

hardware

. Responsible for Linux server builds from scratch and maintaing them

until they go-live

. Installed RHEL on VMware guests

. Monitoring disk, cpu, memory and increasing them as and when required

on VMware guests

. Installed and configured VAS/QAS authentication services on RedHat

servers

. Worked with Client teams in setting up user accesses and permissioning

sudo rights to users for performing certain acitivites

. Worked closely with Windows admins to register users in Acitve

Directory

. Worked closely with network team to open firewall requests to setup

communication between database, ETL & Web servers

. Trunked VLAN's for Blades and VMware guests

. Changed configuration channels in RedHat Satellite for applying latest

kernel patches to servers

. Built Oracle RAC clusters on RedHat servers, configured private

interconnects, maintaining true redundancy between public & private

NIC's

. Worked with network team to configure private VLAN's for Oracle RAC

servers

. Configued Oracle ASM disks for database servers

. Tuning kernel parameters for Oracle database servers for optimum

performance

. Installed FusionIO cards on HP servers and configured them

. Worked closely with Storage team to allocate SAN intime to ensure

server builds are completed

. Used native multipathing tools to configure storage on Linux

. Worked in DataCenter to install memory and fiber cards on servers

. Configured ILO's for HP servers using hponcfg utility

. Installed Veritas Netbackup & configured backups

. Configured bonding on Linux servers to have true redundancy

. Made sure all paper work is upto date for Opertaional turnover of

servers once the go-live is completed

Environment: RHEL 5/6, RedHat Satellite Server, Vmware ESXi, HP Proliant

DL380/DL580/BL 460c, Oracle RAC, Veritas Netbackup, Apache, Solarwinds,

VAS/QAS

Citigroup

Nov 2009 - Sep

2014

Irving, TX

Unix/Linux Administrator

. Active administration of thousands of production, contingency, uat and

development servers comprising RedHat Linux & Sun Solaris servers

. Participated in root-cause analysis of recurring issues

. Creating and maintaining user accounts, profiles, security, rights,

disk space and process monitoring

. Configuring sudo and granting root permission to users for performing

certain activities

. Provide login & SCSU access for users into the servers by creating and

upgrading the appropriate netgroup tables in NIS+ in all domains

. Troubleshoot & Resolve user login issues and SCSU access

. Coordinating with different support teams in resolving the critical

file system and process related issues

. Basic shell scripting for automation of system administration tasks

. Monitoring system resources, logs, disk usage, scheduling backups and

restore

. Installed and configured Tivoli montinoring on all servers

. Responding to Tivoli & AlarmPoint alerts in timely manner

. Experience in Performance Monitoring of CPU, Memory, Disks, and

Network using various

. monitoring tools like SAR and top

. Adding of Swap Space as and when required

. Worked closely with DataCenter teams to rack & stack the new hardware

. Configuring IP's for new servers using QIP tool

. Coordinating with team members to push the newly builds into QA so

that application users can perform testing

. Install, configure and manage RedHat and Solaris servers

. Installation of RedHat servers using custom Jumpstart with LVM as

volume manager

. Installed SCSI Storage media and created volumes with high

availability using different RAID technologies like RAID 0, RAID 0+1

and RAID 5

. Created VM's and deployed RedHat on VMware based VM's

. Configured bonding on RedHat servers & IPMP on Solaris servers

. Performing Kernel & SANstack upgrades for RedHat & Solaris servers

. Ensured automatic startup of different services using chkconfig

. Creation and scheduling of Cron Jobs, System Monitoring and removal of

unnecessary files

. Space allocation to the metadevices, detaching and clearing the

devices if not in use

. Created local zones on Solaris 10, changing the specs as per the

application requirment

. Patched Solaris global zones running on M5k hardware, where local

zones are clustered

. Involved in ongoing Solaris to RedHat migration

. Generated SSH keys for functional users and configured SFTP

. Installed rpm & dstream packages on RedHat & Solaris servers

respectively

. Installed and Configured NFS, FTP, DNS, LDAP, Apache, Wepshere,

Weblogic and Samba

. Troubleshooting issues related to NFS both at Client side & Server

side

. Worked on NIS+ to LDAP migration of users

. Installed, configured and maintained Veritas Cluster Server on RedHat

servers for failover and redundancy purposes

. Configured new service groups and resources for new application in

Veritas Cluster Servers

. Installed and Configured Veritas Netbackup on RedHat & Solaris servers

. Maintaining Netbackup in a Unix infrastructure, enhancing as

neccessary to meet changing requirements, creating documentation and

training, performance and capacity analysis, and troubleshooting slow

running backups

. Installation and configuration of Veritas Volume Manager, Veritas File

System

. Extensive use of volume management tool using Logical Volume Manager

to create disk groups

. Disk management - Adding disk volumes, extending disk volumes,

creating File systems etc using LVM and VxVM

. Solaris boot disk mirroring using SVM and VxVM

. Powerpath configuration for SAN multipathing

. Troubleshoot dual path issues on servers using Veritas DMP & Powerpath

. Worked closely with NAS team, on procurring new NAS filers and

mounting them on RedHat & Solaris servers

. Participated in NAS refresh, migrating EOL NAS filers

. Worked closely with SAN team, getting the luns & creating new

filesystems & also adding them to the existing file systems

. Particiapted in SAN Tech Refresh, migrating EOL SAN frames

. Worked on server consolidation and migration project within data

center and from one data center to another data centers

. Worked on Upgrading emulex cards, firmware for HBA to the current

revision levels

. Participation in change control activities, Involved in Memory sizing

of different applications

. Complete periodic checks of production and development systems, CPU

utilization, memory profiles, disk utilization, network connectivity,

system log files, etc

. Experience on Virtual Ticket, Virtual Request, Infoman and Resolve IT

ticketing Tools

. Experience in supporting different Hardware management & break fix

issues

. Opening an Oracle case for system Software and Hardware issues and

coordinating with SUN FE in resolving the issues during off hours

. Working on problem tickets with different vendors to find the RCA for

Critical issues

. Upgrade Firmware & BIOS microcode on all servers to the latest

recommended level

. On-call on a rotation basis (24/7)

Environment: Solaris 8,10, RHEL 3,4,5,6, VMware ESXi, SUN Netra Servers,

Sun Enterprise E6900/15k/25k/M5k, SunFire V210/V240/V440/V480/V880, HP

Proliant DL 360, DL 380, DL 580, DL 585, BL 460c, Dell Power Edge 2850,

2950, LDAP, NIS+, Veritas NetBackup, Veritas Filesystem, Veritas Volume

Manager, Veritas Cluster Server, WebSphere, WebLogic, Apache, Tivoli

HexaGrid Computing

Oct 2007 - Oct 2009

Saint Louis, MO

Linux Administrator

. Participate in Product Development Roadmaps, Setup Development

server's for Rapid Application Prototyping

. Installed and configured VMware ESXi created VMs and deployed Linux on

VMware based VMs

. Migration of Guest OS from GSX to ESX using VMware Converter

. Migration of physical servers to ESX using VMware Converter

. Worked on VMware ESX virtualization for testing and implementing

servers

. Installed VMware ESX server farm with 25 physical nodes running with

an average of 15 virtual Linux nodes per server

. Responsible for monitoring and maintaining physical and virtual

servers and solving the issues as when they arise

. Implemented Virtual Machine Cloning, Snapshots, Backup Policy

. Backing up of VMDK files using VMware snapshot feature

. Co-ordinate and Assist project delivery time lines

. Used Scripting for backup, recovery, Jumpstart automation and

monitoring

. Provide 24/7 Product Support for Mission critical customer

installations

. Production Readiness Validation Testing for VxGrid Product releases

. Implement Checkpoint Firewall, Firewall Policy, Access Roles

. Implement Software Security Firewall,VLANS using PFSense

. Configure data-center wide Routing, DHCP, DNS

. Install, configure and manage Linux Servers

. Installation of Linux Servers using kickstart and providing support

for various applications running on Linux environment

. Install and configure RPM builds and hardware installation

. Setup Postfix/Dovecot SMTP server for multi-domain both in-house and

for customer implementation

. Setup domain wide whitelist/blacklist spam filter using SPAMAssassin

. Configure Apache/NGINX webserver with Mod_Proxy_Loadbalancer, Mod_SSL

. Installation and configuration of Veritas Volume Manager

. Provided Support and administered Veritas Volume Manager, Veritas File

System and

Veritas Cluster Server

. Install and configure PHP, MySQL and Custom PHP Applications like

Joomla/OSTicket

. Administered disk groups, subdisks, plexes, and volumes using Veritas

volume manager

. Day to day administration of SAN and NAS infrastructure

. Configure Pound Loadbalancer setup loadbalancer policy for smtp/http

and outbound proxies

. Setup Nagios for Monitoring, Operating system variables like

CPU/Memory/Disk and SNMP

Environment: RHEL 3,4,5, CentOS 4,5, SLES 9,10,11, Fedora 9,10,11(beta),

Ubuntu 8.04, 8.10, 9.04 Server, Debian SID, Vmware ESX, Veritas File

System, Veritas Volume Manager, Veritas Cluster Server, HP Proliant DL 360,

Dell Power Edge 2400, 2450, Nagios

HexaGrid Networks Pvt Ltd

July 2006 - Sep 2007

Hyderabad, India

System Administrator

. Install, configure, and maintain servers using enterprise standards

and build process

. Provide problem management support for the production site and

services - troubleshoot technical problems as they arise

. Member of server management operational team

. Implemented VMware ESX server to provide multiple virtual hardware

platforms

. Migrated obsolete hardware platforms to VMs via VMware Converter

. Install VMware Tools on all major OS and troubleshoot software device

driver

. Install, configure and manage RedHat/Windows Servers

. Configured host-based and user-based security for the service using

tcp wrappers

. Configured Mail Sever using Sendmail on RedHat server

. Providing administration and troubleshooting user related problems

. Work closely with DBAs, software partners and Staff in a proactive and

solution oriented manner

. Deploy Tomcat/JBoss clustered application servers in development

environment

. Setup/Configure MySQL database, user roles, sql dump scripts and drbd

replication

. Working knowledge on LDAP, Active Directory

. Installing and configuring of NFS

. Extensive knowledge of debugging scripts/log file validations

. Assist code deployment automation with Shell Scripts

. Patch Management, Package Installation/Upgrades and Kernel upgrades

. Installation and Configuration of Web servers like Apache, Jakarta

Tomcat

. Performed Server design engineering, configuration and troubleshooting

of all components, hardware and software with 32 and 64 bit

processors, Intel and AMD based

. Administering the software packages and patches on servers as well as

workstations

. Configure Nagios Monitoring and configure plugins to get snmp data

from the routers and server's

. Used Webalizer to trend web server archive log retention logs

. Used utilities like VNC, Nessus, Ethereal and Port Monitors

. Performed the administration of the DNS and zone configuration

Environment: RHEL 3,4, CentOS 4, SLES 9,10, Windows 2003 Standard and

Advanced Servers, Vmware ESX, Nagios, LDAP, Tomcat, JBoss

EDUCATIONAL QUALIFICATION:

Bachelor's in Electrical & Electronics Engineering

Jawaharlal Nehru Technological University, Hyderabad, India

Contact this candidate