OLORUNFEMI P. ADESUYI

LINUX SYSTEM ADMINISTRATOR

Email: adlmh8@r.postjobfree.com

Cell: 832-***-****

PROFESSIONAL SUMMARY

Experienced and quality-focused Linux System Administrator with 5+ years of hands-on experience in Designing, Configuring and Administering highly secured and highly efficient I.T infrastructure with knowledge in Cloud computing.

CERTIFICATIONS

Red Hat Certified System Administrator: In progress

SKILLS

Operating Systems: UNIX, Linux (RHEL/CentOS 6,7&8), Windows 2016

Applications: Apache Web Server, Red Hat Satellite Server, NFS, SFTP

Monitoring Tools: Nagios

Networking: DHCP, TCP/IP, DNS, SSH, VPC, TCP/UDP and SMTP

Security/Internet Services: DUO Security, SELinux, Iptables, Firewalld, TCP Wrappers

Virtualization: VMWare VCenter, VMWare ESXi,

Troubleshooting: Unix/Linux (Desktop & Servers) RHEL/CentOS

Other Relevant Technology: Jira, Active Directory, Microsoft Outlook, and Confluence, Timeshift

PROFESSIONAL EXPERIENCE

Linux System Administrator

Doordash Inc., Houston, Texas

September 2020 - Present

Planning, installation, configuration, management and troubleshooting of Red Hat Enterprise Linux 6/7/8 platform.

Provisioning and managing Linux Virtual Machines using VMware VCenter.

Perform package management which includes installation and vulnerability management

Hardware and Software monitoring for performance and availability

Perform file system management using Linux LVM tool

Support user account management to provide appropriate access for users and groups and manage quotas.

Setup secured password-less ssh authentication on servers using ssh keys

Troubleshoot and resolve performance bottlenecks on various servers and workstations.

Installed, configured and supporting NFS servers both in non-production and production environment

Installed, configured, and supporting SFTP server for secured file transfer within the environment.

Installed, configured, and supporting Red Hat Satellite server for provisioning, configuration, and patch management.

Support system backup effort to ensure data and system security, and disaster recovery using time shift.

Involved in proactive monitoring of system to ensure high availability, using Nagios monitoring system.

Configure Linux servers for optimum security using Firewalld and Selinux

Upgraded servers from RHEL 7 to RHEL 8 using both manual and automated approach.

Assist in developing strategic technical documentation and written communication relative to IT and State policies and procedures.

Monitor Jira ticketing queues and provide customer support and issue resolution using Jira ticketing tool.

Building and configuring of EC2 instance on AWS cloud platform

Configuration of Elastic Load Balancer (ELB) for traffic control for the EC2 and S3 instances

Resolved systems and process issues reported by Nagios

Performed file system backups and restores using local archiving utilities to include tar, gzip

Sends weekly report to management on overall system performance and health checks

Took turns for 24/7 production support

Linux System Administrator

Medstar Georgetown - Washington

February 2019 – June 2020

Planning, installation, configuration, management and troubleshooting of Red Hat Enterprise Linux 5/6 platform

Install and manage virtual Linux machines on VMWare ESXi

Work closely with software developers as needed to troubleshoot and resolve production outage

Create mount points for database administrators for Oracle database install

Creation and management of approved user accounts and groups

Manage file systems utilization using script scheduled as cron job

Maintain user-based security via password aging

Maintain file system and host security using chmod, chown, chgrp, immutable bit, iptables and TCP wrappers

Turn-off unused services on systems to strengthen host security

Disabled direct ssh root login on servers

Configure and manage TCP/IP networking on RHEL systems

Troubleshoot and resolved networking issues

Perform software package installation, upgrades and updates using yum and rpm commands

Apply system patches and updates

Manage filesystems using LVM and Veritas VXFS

Perform critical system administration tasks from Single user mode

Create directory symbolic links for users as requested

Install and configure Apache httpd server to be used by developer to host web applications

Took turns for 24/7 production support

Linux/Unix Systems Administrator

Etisalat Telecommunications - Lagos, NIGERIA

February 2015 to January 2019

Installed RHEL 6 on servers and set up volumes

Installed and Administered patches and updates

Installed packages on servers.

Configured and managed Server networking.

Troubleshoot and resolved TCP/IP networking issues.

Performed user accounts administration.

Managed Password aging configuration on servers

Configured and mounted NFS resources.

Maintained file systems and host security.

Disabled direct ssh root login on servers.

Performed security hardening on dedicated servers by turning off unused services

Setup ssh keys for secured key-based authentication

Monitored and controlled system processes.

Monitored and Managed Server performance using associated tools.

Resolved systems and processes issues reported by Nagios

Performed logs administration to detect and resolve system errors

Managed systems storages using LVM

Customize user shell environment using shell initialization files

Configured Apache HTTP and Apache Tomcat Servers

Configure NTP client on servers to synchronize time zone with the NTP server

Configured Server for Oracle Database and Apache Tomcat

Configure DNS client on servers

Utilized cron to schedule and run jobs

Offered various supports to software developers

Responded to and closed out Remedy tickets

Developed functional and technical documentation

Work as part of a team and provide 7x24 support when required

EDUCATION & PROFESSIONAL DEVELOPMENT

B.A Agricultural Science, University of Ilorin, Nigeria – 2013

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