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Linux Administrator

Location:
Manassas, VA
Posted:
February 27, 2020

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Resume:

Venkatesh Yalaganddula

adb0y5@r.postjobfree.com 317-***-****

PROFESSIONAL SUMMARY:

An Ardent Professional having experience in Linux System Administration working on client and enterprise server environments. Demonstrates skills and experience in analyzing, troubleshooting, hardening, usermanagement, monitoring, patching, installation, configuration and decommissioning of Linux systems. Work well with Red Hat Enterprise Linux 6 & 7, Centos, SSL, LDAP, SSH, FTP, DNS, Cron Jobs, Apache Web servers, Virtual Hosts, Kickstart, Applications deployment, Virtualization, VMWare ESXi, DHCP, Linux Networking, Backup and Recovery in an environment of over 2000 servers.

Role: Linux Administrator

Client: PerSys Web Solutions February 2012 – August 2015

Project Overview:

Customer Setup Details Persys Web Solutions -> Beachcomber Customer is One of biggest hosting company in US

Responsibilities:

Proven competencies in managing Linux Server System Administration, skilled at Installing, Configuring, Upgrading and troubleshooting Server down and Client related issues, maintaining High Availability of application services and Log Monitoring daily.

Well versed with Disk Volume Management techniques: Creating, Managing and Administrating volumes using Logical Volume Manager on Linux servers.

Experience supporting VMware infrastructure in a large enterprise environment and perform installation and configuration of multiple Linux Servers

Troubleshoot network connectivity, configure and maintain FTP, NFS, Samba and VNC servers

Configure and support LDAP and client servers, establish secure connection using SSL

Perform troubleshooting to isolate and diagnose common Linux system problems, document system events to ensure continuous functioning.

Maintain and secure servers using IPTABLES and FirewallD, perform regular patches and upgrades

Perform daily system monitoring, verify the integrity and availability of hardware, server resources, systems and key processes, review system and application logs, and verify completion of scheduled jobs

Experience in setup and configuration of over 50 Linux distributions from CentOS, Red Hat and Ubuntu in a virtualized environment using Kernel-based virtual machines and VMware technologies.

Scheduled jobs and automating processes using CRON, created partitions using Logical volume management and increased file systems on Linux servers.

Ensured hardening of newly installed Linux servers using the CIS Red Hat Enterprise Linux Benchmark standards, as well as maintained user accounts and relevant documentation.

Deployed CentOS and RHEL upgrades across company systems, and developed Unix Shell Scripts for executing day-to-day system administration activities.

Administered SSL certificates and demonstrated proficiency in securing and protecting both physical and virtual machines running Apache web server with TLS/SSL certificates.

Troubleshot network and security-related issues, in addition to capturing packets using tools such as Iptables, TCP wrappers, Wireshark.

Ensure the proper functioning of a production environment 24/7 composed of several servers and Monitor systems, analyze and improve their performance and stability.

Improve security and backup processes, On-secured protocols as FTP, HTTP were replaced by SFTP and HTTPS. To protect some world-wide exposed services daemons were configured in jail mode with additional configuration using TCP wrappers and iptables.

Role: Linux Administrator

Client: Company Exabytes Network Sdn.Bhd

Project Overview:

Customer Setup Details Persys Web Solutions -> Exabytes, MY Customer is One of biggest hosting company in Asia Exabytes.com

Responsibilities:

Member of a system administration team that is responsible for a farm of services in 2 data center’s that run MySQL, Linux (Apache) and Window's (IIS) servers.

Responsible for installing, configuring, and maintaining Linux servers and Microsoft servers including web servers, mail servers, application servers and database servers for major provider of financial services.

Also responsible for optimizing system performance and protecting the company from risk and data loss; performing software installations and upgrades to Linux and Microsoft systems and maintaining them in accordance with established policies, procedures and service level agreements.

Install and maintain security patches on the operational and development system, which includes but is not limited to, Red Hat Linux, Windows 2008/2012, VMWare, and Apache web services.

Perform daily system monitoring, verifying the integrity and availability of all hardware, server resources, systems and key processes, reviewing system and application logs, and verifying completion of scheduled jobs such as backups.

Automation of various tasks by creating scripts using UNIX shell / Perl scripting.

Monitoring the functionality and ensuring the health of the network switches and the network ports.

Optimize, secure and control the delivery of services requested by the client / response from the server by creating various policies which defines priority activation, Secure Layer offloading, Data compression etc.

VMware Operational support in installation of ESXI hypervisor 5.0, 5.5, 6.0, 6.7, upgradation on ESXI hosts from 6.5 to 6.7. Physical to Virtual (P2V) and Virtual to Virtual migration using VMware VCenter converter and VMotion.

Monitored System performance such as CPU, Disk, Memory, and Swap space usage. Improved System performance by tuning kernel parameters and scheduling priority of processes on Linux systems and virtual machines.

Created, Managed LVM on storage devices NAS, DAS, SAN (LUN) and ISCI. Other operation included partitions, file system, swap spaces, snapshot, migration, mirrored, backed up and failed LVM troubleshooting.

Configured and managed networking services and protocols Open SSH, TCP/IP, UDP, VSFTPD, HTTP, HTTPS, DNS, NIS, NFS, SAMBA, SNMP, NTP, FTP, DHCP, TFTP, PXE-boot and Kickstart

Managed and monitored user and group policies through Active Directory and LDAP. Implemented appropriate file system permissions on files and folders and Managing Users and Groups.

Network monitoring and troubleshooting by interpreting logs also used other tools e.g. tcpdump and wireshark, ipconfig, ethtool, traceroute, netstat, dig, nslookup and telnet.

Install and configure Apache web server and set up virtual hosts on the web server. Installation and configuration of Linux using both interactive and kickstart/jumpstart.

Perform daily system monitoring, verifying the integrity and availability of all hardware, server resources, systems and key processes, reviewing system and application logs, and verifying completion of scheduled jobs such as backups and file deliveries.

Control the System Logging services and examine system Log Files of all system events, creating, Mount and Unmount File Systems.

Experience with Internet technologies and Proficient with Network Protocols such as DNS, NTP, TCP/IP, HTTP, FTP. Configuration of Static IP, DCHP and Iptables addressing.

Configure and support LDAP and client servers

Technical Skills:

oServers: Servers: RedHat, SuSe, CentOS, Windows, LINUX/UNIX,98/2000/NT/XP, AIX, SunSolaris & HP-UX.

oScripting: Shell – Bash

oWeb & Application Servers: Apache, Tomcat.

oData Bases: MYSQL, Oracle 11g, PostgreSQL 9

oBackup & Storage System: TiNa (Time Navigator) & NAS, SAN.

oVirtualization: VMWare/vSphere 6.x & Oracle VM -Monitoring: Nagios XI, Check_MK

oWeb development: HTML, DHTML, XHTML, CSS, JavaScript, jQuery and AJAX

oCloud: AWS (Amazon Web Services)

Education:

Master’s in information systems - ECPI University Present

Masters in Telecommunication Engineering University of Parma - Parma 2015 – 2019

B-tech in Information technology JNT University 2006-2010



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