Summary
Overview
Work History
Education
Skills
Certification
Timeline
Generic

Israel Adelabu

Lanham,MD

Summary

A seasoned Linux System Administrator with 8+ years successfully managing cloud infrastructure in production environments. Proficient in installation, configuration, monitoring, troubleshooting, log analysis, and hardware support of servers and applications. Expert at maintaining smooth operation of Linux-based hardware installations with dynamic performance in environments relying upon diverse operating systems.

Overview

8
8
years of professional experience
1
1
Certification

Work History

Linux Engineer

NGENA
06.2020 - 06.2023
  • Experience in Agile environments with a focus on CI/CD pipeline including leading Scrum meetings
  • Developed documentation including installation guides, quick reference handbooks (QRHs) for on-shift SRE, user guides and FAQs
  • Work with shift SREs to diagnose, find root causes, and support them as needed
  • Respond and provide on-call support, lead or join triages to understand, troubleshoot, and resolve incidents
  • Installed Nagios Server, deployed NRPE clients and Nagios Plugins to monitor workstations and servers
  • Integrated Nagios with Mattermost for automated notifications to team channels
  • Automated the installation of Nagios server and NRPE clients using Ansible playbooks
  • Windows Active Directory, domain controller, DHCP, and DNS manager: creating users or security groups, granting user privileges, updating and creating DNS records sometimes with windows PowerShell script
  • Deployed OpenStack servers and MySQL, MongoDB, and Redis database clusters using Ansible Heat Stack
  • Experience in OpenStack administrations: installed servers, user creation, Compute, Identity/IAM, Networking, Block Storage
  • Distributed Cloud Operating System (DC/OS) administration: managing services and jobs, user, groups, service accounts privileges, monitoring nodes
  • Gitlab administration: pulling and pushing projects from different Gitlab environments to others; Git user creation and account management
  • Centralized logging experience monitoring and pulling data with Kibana and Elasticsearch
  • Deployed ELK stack and created and exported Elasticsearch indices from ELK stack
  • Create, pulling, and pushing docker images in multiple environments
  • Created Jira projects and managed Jira security groups and users; User and dashboard creation
  • NextCloud installation, user creation, and uploading and downloading files on and off
  • Semanage ticketing experience
  • Deployed Matomo analytic tool used to monitor traffic to multiple sites
  • Nexus Repository management for adding repos in a controlled environment
  • Mattermost installation with Nginx proxy and MySQL database, creating and managing Mattermost and user accounts
  • Creating backups, taking snapshots, sometimes migrating it to other environments
  • Created aliases and deployed them to new environments with ansible
  • Deployed Jenkins server and resolved issues with failed builds
  • Experience with OpenStack Command line and troubleshooting Windows and OpenStack servers
  • Vulnerability scans using Nmap, Nessus, and other Cyber tools
  • Checked technical designs and drawings for adherence to standards.
  • Recorded daily events and activities in site diary to evaluate process and improve productivity.
  • Resolved vulnerabilities by making improvements to network security.
  • Maintained smooth operation of multi-user computer systems through collaboration with hardware and network engineers.

Linux Engineer

VERISIGN
06.2019 - 06.2020
  • Responsible for the provision, management, and upkeep of over 350 virtual desktop infrastructures/environments
  • Explain technical topics to end user development community
  • System configuration, troubleshooting, recovery
  • Handle end user customers with composure and document frequently encountered problems
  • Wrote ansible playbooks to deploy instances and update configurations as needed
  • Proficient in OpenStack services Compute, Identity, Networking, Block Storage, etc
  • Anchor OS and firmware patching on a quarterly basis leveraging ansible playbooks
  • Experience working with docker containers, Ceph tools, and HAproxy, and load balancers
  • Proficient in OpenStack services Compute, Identity, Networking, Block Storage, etc
  • Experience with OpenStack Command line and troubleshooting OpenStack controller nodes and servers
  • Wrote bash(proficient) and python(basic) scripts as needed for automating daily tasks such as VM disk space clean ups
  • Utilized CI/CD tools such Jenkins and git to automate the building of intellij
  • Responsible for the configuration, management, upkeep, and security stance of over 600 virtual and physical servers
  • Configure Domain Control and Active Directory with users and office computers and servers for cluster environment
  • Restructured development cycle to an automated continuous integration concept utilizing Jenkins, and GIT
  • Installed and configured Jenkins server to run builds as needed
  • Configured Red Hat 6.x Enterprise Linux Servers and other Linux distributions and working with applications like Apache, IIS, and Centos
  • Installed & configured Guest operating system like Red hat on VMware ESX 6.x
  • Implemented Kick start for Red hat environments
  • Fine tuning of Operating System and performance analysis, uptime and response time and SLA
  • Performed UNIX System Administration
  • Fine tuning, Kernel debugging, process scheduling, disk and file system I/O, kernel internals, TCP/IP communications
  • Monitoring system activities and fine-tuning system parameters and configurations to optimize performance and ensuring security of systems
  • Automating the installs using Jumpstart and Kickstart and building post install scripts using Shell scripting in SUN Solaris and RHEL Servers
  • Performed server rack mounting and managed /retired old rack optimized server
  • Administered NFS Mounts
  • Wrote Shell Scripts to check the security setting of the server and changing the server settings
  • Installation and configuration of tomcat and Apache Web Server
  • Configuring IP connectivity, routing, checkpoint firewall and network interfaces
  • Also maintaining network connectivity of servers
  • Troubleshooting user logins using various remote login utilities
  • Monitored client disk quotas & disk space usage
  • System performance monitoring and tuning
  • Maintaining and troubleshooting network connectivity
  • Working knowledge with shell scripting using Bourne Again Shell (BASH), Puppet, and Nagios
  • In-depth knowledge of NFS, DHCP, NFS, FTP and network troubleshoot issues and solutions
  • Experience using YUM and RPM for package management
  • Perform daily system monitoring with Nagios, verifying the integrity and availability of all hardware, server resources, and key processes
  • Reviewing system and Application logs and verifying completion of scheduled jobs such as backups
  • Apply OS patches and upgrades on a regular basis, and upgrade administrative
  • Participated in system development life cycle from requirements analysis through system implementation.
  • Monitored and tested application performance to identify potential bottlenecks, develop solutions and collaborate with developers on solution implementation.

Dev-ops Engineer

NOMAD DIGITAL LTD
02.2018 - 06.2019
  • Managed 400+ Linux servers in production for trains and buses
  • Built 2 Q &A and 1 production environments on Amazon Web Services including a Windows and Linux Failover Clusters; the servers host applications such JBOSS, SQL and MySql databases, MongoDB, HTTP, docker (50 Linux servers and 12 windows servers)
  • Configure Domain Control and Active Directory with users and office computers and servers for cluster environment
  • Audited and hardened SSH access on all servers
  • Created Splunk Dashboards to monitor CPU Performance, Peak, Memory Leakage
  • Utilized Splunk to filter unwanted data in heavy forwarder level to reduce license cost
  • Prepared, arranged, and tested Splunk search strings
  • Performed log analysis using Splunk
  • Created Splunk Dashboards to capture Authentication breaches across applications
  • Installed SQL database and web applications (HTTP/HTTPS/SSL) on AWS
  • Installed OpenVPN to ensure internal login to AWS servers for administrators and necessary users
  • Installed quagga and configured OSPF/VTYSH to enable Linux server act as router
  • Allowed external access to AWS servers using PAT on a single IP address
  • Installed and configured GIT as a version control tool for all project configuration files on the Central Control Units on trains and buses
  • Configured Rsyslog on all servers to forward to a central log server
  • Ensured backup and snapshots are taken periodically for all servers including those on AWS
  • Installed and configure several Linux and Windows servers on VMware, XenCenter, Oracle Virtual Box
  • Configured LDAP on Linux servers with use of autofs
  • Set up and managed VPCs with security groups for each zone and particular operating systems
  • Setup and attached EBS volumes to Ec2 instances
  • Created AMI images of Ec2 instances for backups and migration to other AWS zones
  • Configured SNMP to send alerts to PRTG alongside CloudTrail monitoring
  • Created Amazon S3 with life cycle, versioning, and ACL
  • Utilized CloudFormation to automate installation and configuration on AWS
  • Set up auto scaling on DynamoDB, create an IAM, users, groups and assign permission as needed
  • Set up CloudWatch to monitor billing

Site Reliability Engineer

ATLAS CONTAINER
08.2015 - 03.2017
  • Automated patch process using bash scripts and dynamic inventories to ensure full coverage without manual intervention
  • Managed and troubleshot disks and file systems for Linux systems
  • Developed various Linux shell scripts including app init scripts, backup scripts for Perforce depot, and xterm title pointing to host alias names for login
  • Installed, configured, and optimized Red Hat, Solaris, and Ubuntu systems for fault tolerance and load balancing
  • Monitored system performance, created new users, locked/unlocked accounts, reset failed login attempts, and introduced new servers into networks
  • Managed user and group permissions and related policies as required by QA team for application testing
  • Developed shell script to read text file from client server, FTP it to a different location, and call web services to retrieve document ID and send it to another team
  • Assigned servers for different stages in project lifecycle
  • Maintained shell deployment scripts for TC Server/Tomcat web application servers
  • Managed multiple corporate applications in Subversion (SVN)
  • Installed, configured, and maintained Red Hat Linux 4.x, 5.x, and CentOS
  • Provided 24/7 system administration support for Red Hat Linux 4.x, 5.x, and CentOS servers and resolved trouble tickets on shift rotation basis
  • Used YUM to patch RHEL servers, configured local and FTP repositories, and used zipper to install packages on SUSE Linux
  • Handled HP and DELL servers running on Red Hat Linux and SUSE (SLES 9/10)
  • Planned, implemented, and managed NIM Master server and clients
  • Developed bash script to automate Cron jobs and retrieve information about various Red Hat Linux servers
  • Performed Red Hat Linux kernel and memory upgrades and undertook Red Hat Linux Kickstart installations
  • Set up networking services and protocols on UNIX including NIS/NFS, DNS, SSH, DHCP, TCP/IP, ARP applications, and print servers to ensure optimal functionality
  • Utilized logical volume management (LVM)
  • Coded Linux scripts to define variables required for templates and establish database connections to retrieve applicant details
  • Configured VMware on clustered environments, implemented migration of virtual machines using VMotion and storage VMotion, and performed hot and cold cloning of virtual machines using VMware Converter
  • Administered DNS, NTP, NFS, and LDAP
  • Performed hardware maintenance and system administration of existing production environment

Education

Bachelor’s Degree - Computer And Information Sciences

AMERICAN HERITAGE UNIVERSITY OF SOUTHERN CALIFORNIA
San Bernardino, CA
05.2020

Skills

  • Operating systems: Red Hat, CentOS, Ubuntu, Solaris, Debian, Fedora, Kali-Linux
  • Virtualization technologies: Citrix Xenserver, vSphere
  • Cloud Environment: OpenStack, GCP, AWS
  • Database systems: MySQL Server 5x, MySQL Cluster, MongoDB, Percona
  • Web servers: Apache, Nginx
  • Email servers: Sendmail, Exim
  • Monitoring tools:
  • Nagios, Splunk, Nagvis, Shinken
  • Issue tracking and collaboration tools: Jira, Confluence
  • SSH clients: WINSCP, Putty
  • File transfer protocols: FileZilla
  • Active Directory and Domain Controller management: Windows Active Directory
  • Network scanning and analysis: Nmap, Tcpdump, Wireshark, Nessus
  • Security: SELinux
  • Continuous integration and deployment: Jenkins
  • Automation: Ansible, Bash Scripting
  • Containerization and Orchestration: Docker, Kubernetes
  • Debugging Network Configuration
  • Analytical and Methodical
  • Testing Applications
  • Systems Budget Management
  • Software Customizations
  • Requirements Gathering and Analysis
  • Direct Server Support

Certification

AWS Solutions Architect, Linux Professional Institute Certified, RedHat Certified Systems Administrator

Timeline

Linux Engineer

NGENA
06.2020 - 06.2023

Linux Engineer

VERISIGN
06.2019 - 06.2020

Dev-ops Engineer

NOMAD DIGITAL LTD
02.2018 - 06.2019

Site Reliability Engineer

ATLAS CONTAINER
08.2015 - 03.2017

Bachelor’s Degree - Computer And Information Sciences

AMERICAN HERITAGE UNIVERSITY OF SOUTHERN CALIFORNIA

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Israel Adelabu