Sign in

Linux System Administrator/Engineer

McLean, VA, 22101
May 10, 2022

Contact this candidate


Peter Udoka,

Linux Systems


Greenbelt, MD

' 240-***-****


Linux Administrator

Linux Systems Engineer with 8+ years of experience managing and administrating on multi-platform environments such as RHEL 6,7 and Windows servers 2008,2012,2016. Responsible for improving complex systems in a fast-paced, corporate environment. Strong background in software installations and configurations; Skilled at troubleshooting and fixing network connectivity related issues. Highly motivated, teachable and driven team player possessing outstanding interpersonal, technical and communication skills.

Core Competencies

System/Software Installations


Role Base Access Control

File Transfer/Sharing

File Systems

Patch management

System Maintenance

TCP/IP Networking Configuration


Volume/Storage Management

End-User Support


Professional Experience

Blackstone/ECS Federal ò Arlington, VA ò 03/02/2020 to Present

Linux System Engineer

Experience Installing and configuring Ansible AWX/Tower on RHEL 7 servers. Working knowledge of Ansible CLI adhoc commands and Tower configuration management.

Working knowledge of Ansible Dynamic Inventory and Winrm configurations on Ansible Tower.

Experience creating ansible playbook for application install, patching, and STIGing Linux OS.

Break down and analysis of Nessus security scan and utilization of ansible script to remove vulnerabilities for hardening OS disk.

Worked on DISA STIGs and created checklists for server OS hardening

Server administration and application management on Linux and Windows servers.

Experience implementing Linux Firewall settings.

Utilize VMware ESXI/vSphere/Webclient for server administration.

Familiar with SCAP Scans and STIG Viewer

Worked with ISSO and Communicated with multiple tenants on daily basis to gather artifacts for POAM closure.

Utilize Jira ticketing system to track/complete tickets and communicate with DOD clients.

Peter Udoka, Resume – Page 2-240-***-****

IceWarp Inc. ò Springfield, VA ò 03/05/2019-2/27/2020

System Administrator/Technical Engineer

Work on CentOS 7/Windows servers to help clients maintain server uptime and improve performance.

Utilize GUI like structure (Remote Console) to directly affect server functionality and for trouble shooting purposes

Respond to daily tickets that have different severity levels from Instant SLA which require 1hr response time non-SLA which require 24-48 hours.

Troubleshoot clients Windows and Linux server by reading extended groupware, authentication, performance and SMTP logs.

Basic understanding of email protocols SMTP/IMAP/POP3

Basic understanding of groupware (caldav,carddav, Teamchat,)

Helped client configure Exchange Active Sync, Outlook Sync, Desktop Client

Worked with developers to help troubleshoot and fix bugs.

Worked with clients to update/Upgrade IceWarp servers both on Linux and Windows server

Utilize Remote Console to configure Anti-SPAM/BlackList or whitelist for specific domains

Helped client to prevent spoofing/phishing and other common attacks by implementing content-filter rules.

Helped client to implement SPF/DKIM on their server

Utilize basic ICMP tools to troubleshoot network connectivity

Troubleshoot server SMTP ports using telnet

Used Remote console to block brute force attacks by looking at authentication/SMTP Logs

Helped client regain access to hacked accounts using the Remote Console.

Helped client with password recovery using remote console or Webclient.

Trinitech Consulting, Inc. ò Beltsville, MD ò 9/12/2013-02/15/19

UNIX/Linux System Administrator

Build, install, configure, test and deploy, RHEL/CentOS 6,7 on VMware Esxi 6

Managed OS installation and configuration- standard and advanced (net installation, jumpstart and kickstart).

Responsible for assigning hostnames, default gateway, static and DNS address to servers in order to Introduce Linux servers to the LAN.

Performed Disaster Recovery for Critical environments utilizing incremental or full backup recovery using TAR, CPIO or RSYNC tools.

Utilize RSYNC to configure incremental backup across servers.

Peter Udoka, Resume – Page 3-240-***-****

Configured A-records, created and managed users and groups on Active Directory, Solaris and RHEL/CentOS servers.

Installed and configured LDAP server on a CentOS/RHEL 7 using Active Directory.

Setup, configured and troubleshoot TCP/IP related issues.

Performed software installation, application upgrades utilizing packages from local repositories.

Optimized performance of serves by utilizing swap management and upgrading kernel.

Extended logical volumes for file system growth needs using Logical Volume Manager (LVM).

Created and scheduled Cron Jobs for backup, system monitoring and removal of unnecessary files.

Reduced risk by remediating security vulnerabilities in Infrastructure environment, including removal of vulnerable applications (telnet, ftp and rlogin).

Configured firewall, and SElinux for RHEL 7, to prevent unauthorized access.

Configured “Encrypted Partitions” on CentOS/RHEL 7.

Increased end-user productivity by immediately troubleshooting and fixing system issues emanating from hardware and software.

Respond in effective and efficient manner to tickets generated on Star web based application.

Optical Options. ò Rockville, MD ò 8/2/2010-9/10/2013

Desktop Support

Provided hardware support for the help desk.

Configured file and print sharing then mapped shares to drive letters.

Configured TCP/IP settings on multiple windows systems in order for the system to join the LAN.

Troubleshoot and fix system issues using built in windows troubleshot application.

Installed new hard drives and upgraded software for clients.

Maintained accurate and up to date inventory of hardware and software resources.

Installed antivirus applications, uninstalled obsolete applications, and deleted system junk files.

Utilized the SFC/chkdsk command to find and fix corrupted/defective OS files and hard drives.

Delivered accurate customer service in a timely fashion resulting in increased customer satisfaction.

Technical Skills


Red Hat Enterprise Linux 6/7, CentOS 6/7, Windows Server 2008/2010/2012/2016


VMware vSphere Virtualization (ESXi 6,) Apache web services (HTTP), WinSCP, PUTTY, IceWarp Remote Console, Ansible Tower, NFS

Networking Protocols/tools:

TCP/IP, DNS, DHCP, ICMP (PING), Ethernet, NAT, Subnetting /CIDR, Netstat, Wget, SCP, SFTP, FTP, SSH, MAC, ARP, CIFS, SMTP, POP3, IMAP

Peter Udoka, Resume – Page 4-240-***-****

Access Security Protocols: SUDO, RBAC, ACL, SElinux

Volume/Storage Technology: LVM, ZFS, SVM

Backup Tools: RSYNC, CPIO, TAR


Montgomery College, Rockville, MD

Associates of Science-2003-2007

University of Maryland, College Park, MD – (100 credits completed)


Redhat Certified System Administrator (RHCSA) – 2018 through 2021

Certification ID: 180-160-194

CompTIA Security+ ce Certification: 05/2021- 05/2024

Certification ID: COMP001021841250

Public Trust Clearance

References available upon request

Contact this candidate