Linux Certified Engineer

DHANABALAN SATTAIAPPAN Red Hat Certified Engineer (160-091-393)

****, ******* ******** ** 201-***-****

Atlanta, Georgia - 30338 ************@*****.***

EDUCATION

Bachelor of Engineering in Electronics and Communications,

Government College of Engineering, Anna University, India

CERTIFICATION

Red Hat Certified Engineer ( RHCE ) -160-091-393

Red Hat Certified System Administrator ( RHCSA )-160-091-393

CCNA

SUMMARY:

Over 11+ years of experience specialized in System Administration/ Engineering working on Red hat Linux, Suse Linux, CentOS, Fedora and Windows environments.

Performed multiple times tech refresh / Data center migrations / OS Migrations / Upgrades in various organizations at very large scale. Mostly in Unix / Linux Infra.

Rack mounted high end blade servers and making sure that new servers are properly cabled using fiber, Ethernet cable and PDUs installed. Acted as first line of defense for datacenter crisis.

Have experience in various domains like HealthCare/ Insurance.

Experience in Installing, upgrading and configuring RedHat Linux using Cobbler, PXE, Kickstart Servers and Interactive Installation.

Experience in administering Virtualization Infrastructure with VMware, Xen and KVM.

Implemented different authentication services like LDAP, Active Directory/ Winbind.

Hands-on experience in implementing Puppet, Ansible. Installation and upgrading of packages and patches configuration mgmt, version control, service pack & reviewing connectivity issue regarding security problem.

Worked with Database administrators to tune kernel for Oracle installations.

Experience in creation and managing user accounts, security, rights, disk space.

Good experience in identifying risks and implementing Systems Security Solutions in Distributed Computing Environment. Have skills implementing & maintaining Unix/Linux security products such as BigFix, Trend Micro Deep Security, SELinux.

Experience in configuration of DNS, DHCP, NFS, SAMBA, NIS, SQUID, postfix, sendmail, ftp, remote access, security management and Security trouble shooting skills.

Expertise in scripting for automation, and monitoring using bash, ksh Shell.

Experience in Installing Firmware Upgrades, kernel patches, systems configuration, performance tuning on Unix/Linux systems.

Configured volume groups and logical volumes, extended logical volumes for file system growth needs using Logical Volume Manager LVM commands. Experience working in SAN environment like EMC, NetApp.

Configuring & Administration of Samba Server on Linux for UNIX File System Access on Windows Environment.

Performed registration of Redhat Subscription to different Redhat Systems.

Tuning kernel parameters according to application/database requirement

Programmed extensively in UNIX Shell Scripting.

Tracking documenting day to day work using Atlassian tools: Jira, Confluence

COMPUTER SKILLS

Operating Systems Red Hat Linux, Centos, Ubuntu, SUSE

Directory Server LDAP, Window Active Directory, SAMBA

Security Application Trend Micro Deep Security, SElinux, Duo authentication, BigFix

Storage integration EMC, NetApp, LVM, NAS, NFS, iSCSI and RAID

Virtualization VMWare, Vsphere ESXi, Xen, Qemu KVM, Container

Networking Switches (L2/L3), Cisco Routers, tcpdump, wireshark

Messaging Postfix, Sendmail, SMTP

Servers Dell Blade Power Edge, Compaq Proliant DL Series

Source Control SVN

Build Management Jenkins

Configuration Management Puppet, Ansible

Scripting Bash, KSH Shell scripting

Web technologies Apache http web server, PHP, HTML, Wordpress

Protocols LDAP, DNS, WINS ADS, DHCP, TCP/IP, FTP, Telnet, NFS.

HPC and cluster keepalived

Monitoring Zabbix, Nagios

Database Mgmt Oracle RAC 11gR1/R2, Mysql, DB2, MariaDB, Mongod, Postgres

Other tools JIRA, Confluence, GLPI(Asset Inventory), Grafana, Box, KeePass

AWARDS

Star Award - For the Outstanding employee of the Month - June - 2008

Premiere Team award – For Service Improvements - May - 2011

PROFESSIONAL EXPERIENCE

Consultant – MMODAL Atlanta, GA, USA June 2016 – Current

Linux System Engineer

Involved in Datacenter migration at MModal from Philadelphia, PA to Alpharetta, GA Datacenter. Work included setting up Dell Power Edge blade servers. Installing OS and databases to its newer versions and migration of all applications and data.

-Designing, implementation, deployment and maintenance support of the infrastructure; Responsible for managing all Red Hat Enterprise Linux Servers which provide 24/7/365 for the FFT Platform, this also includes management using Spacewalk for the CentOS systems for the M*Modal CDS Service. This includes using Red Hat Satellite server to manage the systems from a central location. Using kickstart scripts, management and provisioning from the satellite server to keep all systems current and for repeatable builds. Monitoring with Open Source Enterprise Nagios.

-Performed data-center operations including Rack mounting of Dell Power Edge m1000e blade servers, cabling using Fiber and Ethernet Cable.

-Setup and configured Dell IDrac for installation of OS using DHCP, Kickstart, and PXE servers for automated system builds using Cobbler.

-Setup and configured Virtualization Environment using VMware Vsphere for Dev/QA /Prod Environments. Cloning of different VMs and created different templates based on Application requirement.

-Working with business units to develop process and procedures for formalizing the production environment. Gathering requirements from application team and design, implement and provide solutions in building the environment.

-Preparing servers for Oracle RAC installation which includes tuning the kernel, agent installation, adding NAS / SAN storage.

-Experience in installation, configuration file system management through Logical Volume Manager LVM. Configuring multipath, adding SAN and creating physical volumes, volume groups, logical volumes.

-Closely work with Application development team and Database team for their requirement of server and storage resources.

-Ensure connectivity among all the physical and virtual servers and storage and SAN. Define network and subnet for the servers. Closely work with Network team to set firewall rules and determine open ports for different application requirements.

-Setup NFS file systems and shared them to clients.

-Closely work with application team to tune Linux kernel to achieve low latency.

-Deployed BigFix agents to manage around 200 Endpoints for Self-assessment, policy enforcement, Patch management and checks for vulnerability.

-Troubleshoot issues related to hardware, operating system and networking.

-Monitor servers daily Health Checks using Nagios, Capacity Reporting, Heat Map Analysis and the implementation of appropriate Real-time Alerting, Capacity Planning.

-Implemented Trend Micro in overall infrastructure and installed agents in different machines for maintaining the security of all servers by assigning different policies.

-RPM and YUM package installations, patch and other server management.

-Monitored server and application performance & tuning via various stat commands (vmstat, nfsstat, iostat etc) and tuned I/O, memory, etc.

-Reviewing system log files for errors. Setting up cron jobs for backups and monitoring.

-Participate in RCA of recurring issues and provide permanent resolution.

-Perform Decommissioning of Servers as per process.

AON – Chennai, India / Chicago, USA Feb 2006 – May 2016

Linux Administrator

Performed two times Tech Refresh work at AON in two different datacenter in Chicago, IL and Woodlands, Texas Datacenter. Work included Migration, upgradation, designing and replacement of hardware, upgrade underlying OS and databases to its newer versions for 55 business applications hosted on 245 legacy servers.

Involved in implementation and maintenance support of web infrastructure and features that are cost effective and sustainable; Primarily focused on Linux - RHEL, CENTOS, Apache, OpenLDAP and application stack consisting of Apache Tomcat, Content Delivery technologies, AiCache, Memcache, Drupal, LAMP, Cluster (keepalived) and other relevant technologies) including mobile web sites.

Setup and configured Virtualization Environment using Qemu KVM for Development/QA/Stage Web Infrastructure Environments. Created templates for auto creation of virtual hosts.

Working with multiple technical teams with various technical skill-levels. Established industry wide best practices for maintaining system configurations, OS standardization, hardware and software baselines, and hand shake between the different groups, server hardening process, documentation of installation procedures and support information.

Established YUM repositories used in conjunction with the kickstart server.

Implementation, deployment and Day to day monitoring for our web /utility /web accelerator’s clusters (Keepalived)

Responsible for upgrading system, capacity planning, security and disaster recovery.

Administering web servers and applications including web server maintenance and patches/ fixes.

Setting up and managing Company website’s aiCache Web acceleration servers.

Maintaining and enhance website’s monitoring framework (Zabbix).

Maintaining the security of web resources by adhering to all applicable Company policies.

Assisting in the implementation and maintenance of all web-enabled applications.

Systems Support on Redhat Enterprise Linux/CentOS/SUSE/MYSQL/NFS

Web Server Administration and troubleshooting with knowledge of Apache/ Tomcat

Server hardware monitoring and maintenance

System Administrator

Administration of (RHEL) Redhat Linux 5.x, 6.x which includes installation, testing, tuning, migration, upgrading and loading patches, troubleshooting both physical and virtual server issues.

Coordinating with the vendor to resolve agent errors and issues as needed

Troubleshoot issues related to hardware, operating system and networking.

Verify storage and create file systems and volumes using LVM.

Cross platform architectures for infrastructure. Linux systems planning, documentation and tuning.

Linux server performance tuning based on the app/web/database requirements.

Get the final sign offs from AD, Infra-architect and support teams on requirements.

Conduct build validation and performance checks and Perform DR and/or HA (if needed) checks, configure and check backup and recovery.

Configure Monitoring, Set up Alerts threshold and threshold procedures, configure distribution channels, and test their working and acknowledgement procedures.

Configure and test maintenance scripts, schedule their execution using appropriate job scheduler and validate their invocation, duration, log generation.

Load the data as required for Dev/QA/UAT and production cut-over. Participate in Functional, performance and stress tests and production cutover-migration dry-runs.

Creating, cloning Linux Virtual Machines, templates using KVM virtualization

Installing RedHat Linux using kickstart and applying security polices for hardening the server based on the company policies.

Tech and non-tech refresh of Linux servers which includes new hardware, OS upgrade, application installation, testing.

Installing and configuring Apache and supporting them on Linux production servers.

Troubleshooting Linux network, security related issues, capturing packets using tools such as IPtables, firewall, TCP wrappers, NMAP.

Coordinated with the Storage, Network and Hardware teams on server provisions

Experienced in Troubleshooting critical hardware and software issues.

Developed automated processes that run daily to check disk usage and perform cleanup of file systems on UNIX environments using shell scripting and CRON.

Monitor LDAP / SELinux Infrastructure by running daily Health Checks, Capacity Reporting and analyzing heat maps. Investigate/fix issues as required and escalate as appropriate.

Install SSH keys that Users have generated into SELinux protected directories across domain.

Perform risk assessment surveys to identify security requirements.

Harden and secure UNIX servers as well as monitor security reports and logs.

Installation, configuration and maintenance DNS, Mail, NFS servers on Redhat.

Configuring distributed file systems and administering NFS server and NFS clients and editing auto-mounting mapping as per system / user requirements.

Wrote various Bourne shell scripts to probe network backbone equipment and provide vital statistics about the availability and responsiveness of the network.

Performed scheduled incremental backups using “ufsdump” and recovered and rolled over backups. Used “tar” to ship directories/files.

Troubleshooting backup and restore problems and constant monitoring of system performance.

Implemented various RAID levels, logical volume creation, mirroring and file systems.

Automating tasks is given the highest focus which involves in writing scripts using shell and Linux to generate alerts/reports on critical systems.

Perform software installation, upgrades/patches, troubleshooting, and maintenance on Linux servers.

Responsible for capacity planning, including allocating storage, providing hardware and software redundancy, and planning future expansion requirements.

Perform monthly health checks on wide range of multi-platform servers and ensure it complies with standards. Run security audits on servers and applications.

Involves writing & executing shell scripts to perform any change on client nodes.

Before performing any change on the Hosts, a Risk Assessment has to be done that is signed by the customer.

Junior Linux Administrator

Installed and Configured Redhat Linux on different servers.

Disk management and LVM Administration

Creating and Managing User Accounts & Groups.

Administration of file and directories with basic file permissions.

Network administrator, Linux networking installations, Server installations, Configured IP address for different servers and troubleshooting.

Install the packages using YUM & RPM.

Installation of new software as per the requirements

Installation and upgradation patch’s in Linux.

Adding and Configuring Peripheral Devices to the System.

Configuring project related applications and tools.

Monitoring File System use and growth.

Taking System backup and recovery Using tar, dump, cpio

Scheduled various regular, periodic queue tasks by using crontab, at.

Monitoring system performance for Linux workstations, servers, and peripherals.

Responsible for monitoring and reporting. System and data Backups. Monitor Internet line to ISP.

Maintaining and Managing Databases (MySQL and DB2) to support Application.

Creating, Resolving and closing the issue ticket as per agreed SLA time.

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