Nikilesh Gurrala

Email: ad0y82@r.postjobfree.com

Linux/Unix Administrator

Technical Summary:

Over 8 years of IT experience in UNIX System Administration in Red Hat-Linux, SUSE Linux, IBM-AIX and Windows environments.

Extensive experience in Installation, configuration and administration of AIX 4.3/5.1/5.2/5.3/6.1, Red Hat Linux 8/9, RHEL 3.x/4.x/5.x, Red Hat Satellite 6, OEL 4/5.x and SUSE Linux 10.x/11 and day-to-day system admin tasks.

Configuring Audits Reports.

Expert in Kickstart, Jumpstart and NIM installation methods for RHEL and IBM-AIX

Created and maintained user accounts, profiles, security rights, disk space and process monitoring.

Installation of guest OS, configuration and patch application on hosts using Tivoli Provisioning Manager TPM.

Implemented day-to-day tasks in Red Hat Linux including upgrading RPM's, Kernel tuning, HBA Driver, configure SAN's, Multipathing and Logical Volume Manager LVM

Installation of patches, security fixes and packages on AIX and Linux servers

Installation and configuration of Web hosting administration such as HTTP, FTP, SSH, RSH

Experience in Configuration of multiple logical subsystems utilizing IBM HMC with LPAR configuration, NIM to install LPAR.

Providing Troubleshooting and Customer support in critical 24x7 production and development environments.

Experienced in working with SAN hardware from vendors including EMC Symmetrix and Clarion, Hitachi and Sun StorageTek.

Expert in automated installation, software distribution and production deployment using System Imager.

Working experienced with Blade Logic Infrastructure on Linux OS.

Experience in LPAR, having Knowledge on Dynamic LPAR and different Regatta servers like p630, p650, p670 and p690.

Expertise in Installation and configuration of HACMP v 5.1/5.2/5.3 and also migration of HACMP 4.3.1/4.5 to 5.1 using node-by-node migration without changing the cluster setup.

Supported WebSphere Application Server, IBM HTTP/ Apache Web Servers in AIX environment for various projects.

Experienced in installing LAMP Linux, Apache, MySQL, and PHP for different applications.

Expert in Installing, configuring and maintaining DNS, NIS, NIS, NFS, DHCP, TCP/IP.

Expertise in implementation and designing of disaster backup and recovery plan.

Expertise in Networking TCP/IP, Ethernet, FTP, NFS, NIS, DNS, DHCP and RAID levels.

Experienced in working with different teams such as Network Engg., Database team and application teams to resolve the issues and provide Customer Satisfaction.

Experienced with using Oracle RAC for clustering and high availability in Oracle database environments.

Efficiency in installing, configuring and implementing the RAID Technologies using various tools.

Expert in managing a cluster of servers using Red Hat GFS.

Expert in Installing, configuring and maintaining apache/tomcat, samba send mail, Web Sphere Application Servers.

Implemented Open SSH based security for the RH-4.

Experience in Installing and configuring Wireless network using SSL Certificate and RADIUS authentication. Set up Linux firewall router to increase network protection.

Proficient in System Backup and Recovery from tapes using ufs dump, ufs restore, tar and cpio

Excellent scripting skills in UNIX Shell, Perl and python.

Excellent skills in analyzing, designing, implementing and system integration, Knowledge on Switches, Routers, Firewalls

Configured and Troubleshooted TCP/IP network services

Performed server consolidation and virtualization using HPSA V sphere ESX 3.5/4/4.1 created VM's on Virtual Center server and installed guest OS using Virtual Infrastructure client.

Professional Experience:

Client: Comcast, Philadelphia- PA January 2021- Till Date

Role: Sr.Linux/Unix Admin

Responsibilities:

Installed, Configured and Maintained Debian/RedHat Servers at multiple Data Centers.

Configured RedHat Kickstart for installing multiple production servers.

Installation of Red Hat Satellite 6 Server.

Installation, Configuration and administration of DNS, LDAP, NFS, NIS, NIS and Send mail on RedHat Linux/Debian Servers.

Installed, Configured and Maintained Active Directory Windows Server 2008.

Migration from SUSE Linux to Ubuntu Linux

Created Audit Report using aur epopt.

Configured, Maintained OVM

Configured, Maintained, Installed OEL

Installation, Configuration and administration of VMWAREIBM Blade servers

Experience working with production servers at multiple data centers.

Experience using BMC BladeLogic client automation Tool

Installed Checkpoint Firewall to secure networks

Experience in migration of consumer data from one production server to another production server over the network with the help of Bash and Perl scripting.

Used Puppet for Monitoring system and automation.

Installed and configured monitoring tools such as munin and nagios for monitoring the network bandwidth and the hard drives status.

Developed and supported the Red Hat Enterprise Linux based infrastructure in the cloud environment.

Experience in AWS

Configured Azure VMs for Windows Systems

Managing and scaling complex SaaS for web services

Experience with using Centrify

Developed automation scripting in Python core using Puppet to deploy and manage Java applications across Linux servers.

Diagnosing failed disk drives using shell scripting for automated tasks.

Logged events from forced crash dumps and troubleshooted server issues.

Troubleshooting production servers with IPMI tool to connect over SOL.

Experience with system imaging tools Clonezilla and System Imager for data center migration.

Configured yum repository server for installing packages from a centralized server.

Installed Fuse to mount the keys on every Debian Production Server for password-less authentication.

Installed and configured DCHP server to give IP leases to production servers.

Management of RedHat Linux user accounts, groups, directories and file permissions.

Applied the Clustering Topology that meets High Availability and Failover requirement for performance and functionality.

Configured, managed ESX VM's with virtual center and VI client.

Performance monitoring using Sar, Iostat, VMstat and MPstaton servers and also logged to munin monitoring tool for graphical view.

Performed Kernel tuning with the sysctl.

Installed packages with yum and rpm.

Installation and configuration of Postgres SQL database on RedHat/Debian Servers.

Performed Disk management with the help of LVM Logical Volume Manager.

Configuration and Administration of Apache Web Server and SSL.

Configiredopen-ssl and generated self-signed keys for internal use.

Experience with NoSQL MongoDB

Password-less setup and agent-forwarding done for SSH login using ssh-key gen tool.

Created and maintained network users, user environment, directories, and security.

Documented strongly 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 and KVM.

Provided 24/7 on call support on Linux Production Servers. Responsible for maintaining security on RedHat Linux.

Environment: Debian and Redhat Linux and SUSE Linux, Ubuntu Linux, KVM, VMWAREIBM blade servers, BladeLogic, IBM DS8300 SAN, HP UX, WebSphere 5.x/6.x, Apache 1.2/1.3/2.x, Logical Volume Manager, VERITAS NetBackup 5.x/6.0, SAN Multipathing MPIO, HDLM, Power path, VM ESX 3.x/2.x, RHEL 5.x/4.x and Windows Server Environment, Windows 2008 / 2012, Python, Puppet.

Vanguard – Media, PA March 2018 -December 2020

Role: Unix/Linux Administrator

Responsibilities:

Administered, maintained Red Hat Enterprise Linux 5.10, 4.8, Ubuntu troubleshooting hardware, operating system, applications network problems and performance issues

Installed, configured and administered AIX 5.1, 5.2, 5.3, Ubuntu Linux HACMP

Installation of Red Hat Satellite 6 Server

Worked with KVM Hypervisor to install, configure and maintain Red Hat Linux.

Deployed latest patches for, Linux and Application servers, performed Red Hat Linux Kernel Tuning

Performed Servers consolidation and virtualization using HPSA virtual infrastructure, VMware ESX, Virtual Center, VM tools.

Experience with Audits in RHEL.

Experience with using Centrify

Deployed OEL

Installation, Configured OVM

Experience in IBM cloud Services and AWS for cloud computing.

Installation of Azure VMs on Linux system

Scaling complex SaaS for web services

Configured Active Directory Windows Server 2008

Installed Check Point Firewall

Install and configure DHCP, DNS, web Apache, IIS, mail SMTP, IMAP, POP3, and file servers on AIX and Red Hat Enterprise Linux servers

Installing and setting up Oracle9i on Red Hat Linux for the development team

Installed Web Logic 9i with SP5 Server and configured Domains, Admin and managed servers for Applications to be deployed.

Experience using BMC blade logic client automation Tool

Used Puppet for Automation and system monitoring tool.

Wrote shell, perl, python, ruby scripts to automate daily repetitive activities.

Provided production support of Apache and JBoss including installation, configuration, and management and troubleshooting.

Implemented virtualization using HPSA in Red Hat Linux on HP - G7, G8 and IBM-z/VM series.

Implemented day-to-day tasks in RHEL that include upgrading rpms, kernel, HBA driver, configuring SAN Disks, multi pathing and LVM file system

Linux kernel, memory upgrades and swaps area and performed Red Hat Linux Kick start installations

Hardware Maintenance and System Administration of existing RS 6000 running AIX 40 systems in Network

Created users, manage user permissions, maintain User File System quota on Red Hat Enterprise Linux and AIX.

Experience in Migration of HACMP 4.3.1,4.5 to HACMP 5.1 using Node-by-Node migration without changing the cluster setup

Apache/Tomcat server, mail server, MySQL database, and firewalls in both development and production

Regular maintenance of VERITAS Cluster, MC/Service guard Packages and load balancing

Wrote Scripts for automating and testing the code using Perl, Korn.

Configured and administrated Lpar's/DLpars's.

Manage systems using remote consoles like ILO for HP Hardware

Setup network printers and installed client/server applications.

Defined/setup network protocols, Network File Services NFS, and Network Information Services NIS in Red Hat Linux and AIX systems

Network trouble shooting using 'netstat', 'ifconfig' and 'tcpdump' etc

Administration and Configuration in VERITAS Volume Manager/VERITAS File System

Monitored trouble ticket queue to attend user and system calls, attended team meetings, change control meetings to update installation progress, and for upcoming changes in environment.

Environment: Red Hat Enterprise Linux 4.8,5.10, Ubuntu, VERITAS Cluster Server, Veritas Volume Manager, Oracle 11G, Perl, Korn, HP UX, IBM AIX, SAN, EMC VNX HP Proliant DL 380,560 WebLogic, Oracle RAC/ASM, MS

Windows 2003, 2008, 2012 server, IBM and AWS, Python, Puppet.

Infosys- Bangalore-India January 2017 - February 2018

Unix/Linux Administrator

Responsibilities:

Installation, configuration and OS upgrades on AIX 5.3 Redhat Linux 6 and SUSE Linux 11.

Installation, configuration, and maintenance of Sun Solaris 9, 10 servers.

Configuring Kickstart/AutoYast Servers and booting the images using PXE in Redhat Linux RHEL SLES

Installation of Red Hat Satellite 5 Server

Maintained Active Directory Windows Server 2008

Installed OS by using NIM method for AIX.

Experience in AWS, Azure

Experience in IBM cloud Services using SAAS

Installation of patches and other software packages on AIX and Linux Servers.

Administration and Troubleshooting AIX servers running business critical application WebLogic applications.

Implemented and monitored clustering on IBM p series servers using HACMP 5.4.

Experience in LPAR, knowledge on creating Dynamic LPAR's and created WPAR on AIX.

Experience with migration SUSE Linux to Ubuntu Linux.

Modified AutoYast XML scripts for automated SUSE Linux Installation.

Used Veritas File system VxFS and Veritas Volume Manager VxVM to configure RAID 1 and RAID 5 Storage Systems on Sun Solaris.

Installed Check Point Firewall for networks

Installed and configured SAMBA server for windows and Linux connectivity.

Installing, configuring and deploying applications on WebLogic Application Server 9.0.

Implemented and configured Backup policies and Storage Units using Veritas NetBackup 6.5.

Performed file system tuning, growing, and shrinking with Veritas File system 3.5/4.x.

Installed WebLogic 8.1 with SP5 Server and configured Domains, Admin and managed servers for applications to be deployed.

Experience in internet services installation, configuration and maintenance WWW on apache, SMTP on send mail, POP3, LDAP... on Linux and AIX platforms, including security of provided services, ability to troubleshoot common and very uncommon problems, high availability services.

Configure HACMP for a clustering environment on AIX servers and administered the virtualization environments consisting VIO servers.

Use ILO/IMM/HMC for remote access of servers on Linux/AIX respectively.

Experience in Implementation Apache, Tomcat 5.5 for the Java Servlet and Java Server Pages technologies.

Administered the UNIX/Linux System for clustered HP Servers with fiber attached SAN storage.

Maintained troubleshooted SAN and Fiber card related errors on UNIX

Discovered and attached LUNS provided by the Storage team to the required Unix/Linux Servers.

Maintained Troubleshooted Storage Disks from IBM and EMC Disk arrays.

Created disk pools and configured shared virtual disks using Symmetrix Management Console.

Installing, maintaining, upgrading and supporting Redhat Linux systems w/ Oracle 10G RAC with Cluster Ready Services CRS and Sybase database.

Installed and configured LAMP Linux, Apache, MySQL, and PHP for different applications.

Expert in writing Shell scripting using Ksh/Csh/bash/Sed/Awk.

Scripted in python to deploy and manage applications.

Monitored servers, switches, ports etc. with Nagios monitoring tool.

Administered 8-server Redhat Linux cluster, 6-server fedora core6 cluster, IBM DS4300 Storage, Veritas Clustering VCS and miscellaneous servers.

Experience in Servers consolidation and virtualization using UML Linux, XEN and HPSA vSphere virtual infrastructure, HPSA vSphere ESX, HPSA vSphere Venter.

Implemented NIS and NFS for administrative and project requirements on AIX and Linux platforms.

Worked closely with database administration staff to ensure optimal performance of databases, and maintain development applications and databases.

Tuning the kernel parameters based on the application/database requirement.

Environment: AIX 4.3/5.1/5.2/5.3, Redhat Linux AS3.0, AS 4.0, Sun Solaris 9,10, SLES 9, 10, IBM System p series 520/570/590/630/650/670, HP UX, Sun Fire 6800, 4800, V890, V880, V490, V480 and V210, Veritas Volume Manager, IBM HACMP 5.4, Veritas Cluster Server, DS8300, Python, WebSphere ND 5.1, XD 5.1, WebLogic 8.1, Samba, Oracle 9i/10g, Veritas

TCS- Hyderabad-India January 2017 - February 2018

Unix/Linux Administrator

Responsibilities:

Performed installation, configuration and maintenance of Redhat Linux 5.3.

Handling HP and DELL servers running on Redhat Linux and SUSE Linux 9 and GNU.

Linux kernel, memory upgrades and swap area. Redhat Linux Kickstart Installation. Configuring DNS, DHCP, NIS, NFS in Redhat Linux other Network Services.

Performed daily backups, restoration of data as per requests from developers using VERITAS NetBackup.

Experience in Servers consolidation and virtualization using HPSA vSphere virtual infrastructure, HPSA vSphere ESX.

Wrote Shell Scripts as cron jobs and deployment scripts for various reasons in VIM editor.

Audited the servers after the installation and prepared documents.

Worked on EMC disk storage to allocate disk space.

Network trouble shooting using 'ndd', 'traceroute', 'netstat', 'ifconfig' and 'snoop' etc.

Provided Security and troubleshoot the network issues in environment with 2500 users with VPN.

Installed of all the required Software, patches, documentation, licensing trouble shooting.

Network Monitoring Using Nagios tool.

Setup various user profiles, environment variables/security to ensure smooth operation.

Monitoring servers using BMC patrol Express.

Good understanding of web services software architectural and design issues.

Monitored overall system performance, performed user management, system updates and disk storage management.

Created users, manage user permissions, maintain User File System quota on Redhat Linux and AIX.

Production support of Apache and JBoss including installation, configuration, management and troubleshooting

Implementing RAID 1 and RAID 5 on mission critical servers such as domain controllers and file servers.

Setup of full networking services and protocols on UNIX, including NIS/NFS, DNS, SSH, DHCP, NIDS, TCP/IP, ARP, applications, kickstart and print servers to insure optimal networking, application, and printing functionality.

Installed and configured Sudo for users to access the root privileges

Performed troubleshooting of CPU bottle necks, memory bottle necks and gave suggestions on performance improvements. Analyzed performance issues through PERFPMR.

Wrote Technical documentation for various projects and worked with technical writer to finalize the documents.

Environment: Red hat Linux 4.0,5.0, HPSA vSphere ESX Server 3.5.0, JBOSS, Remedy, EMC Power Path, windows 2000/2003, Sun Solaris 8,9,10, Solstice Disk Suite, AIX 5.3, Veritas Cluster Server, Enterprise Security Manager, Opsware, WebLogic 8.1, Oracle 9i/10g.

Environment: RHEL 4.x, 5.x, AIX 5.3/6.1, TPM, X86, IBM P570, P590, HACMP 4.3.1 and 4.5, Veritas NetBackup 4.5, VCS, WebSphere Application Server 3.5/4.0.x, JBOSS, LDAP, DNS, NIM, NFS, TCP/IP, SAN, NAS, Nagios 2.x, Web Logic 8.1, Oracle 9i/10g, Tivoli Storage Manager 5.x, HPSA vSphere 3.5/4.x, Shell Scripting.

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