J. Brock Callahan
Linux / Systems Administrator
Linux infrastructure, networking, server migrations, troubleshooting, containers, web platforms, and security. Hands-on experience with production systems on DigitalOcean and Cloudways.
Available for fixed-term and project-based systems administration and infrastructure work.
Selected infrastructure work
- Migrated production WordPress workloads to Rocky Linux on DigitalOcean, configuring nginx, PHP-FPM, MariaDB, SELinux, DNS, TLS, and Cloudflare.
- Supported and migrated a Cloudways WordPress multisite environment of approximately 30 sites.
- Built and operated containerized environments with Docker and Docker Compose.
- Implemented Keycloak and OpenID Connect integration for a cybersecurity capstone project.
Technologies
Rocky Linux · Ubuntu · nginx · PHP-FPM · MySQL / MariaDB · Docker · DigitalOcean · Cloudflare · Bash · DNS · TLS · SELinux · WordPress · Keycloak · OIDC · Networking
Certifications
CompTIA A+ · Network+ · Security+ · Project+ · CySA+ · PenTest+ · ISC2 Associate · ITIL 4 Foundation · LPI Linux Essentials