Linux Server Admin with Fexingo: Sysadmin, Bash, and Server Engineering

Episode 4 of Linux Server Admin looks at the single most common server authentication mistake: misconfigured SSH keys. Lucas and Luna walk through a real post-mortem from a fintech startup that left port 22 open with password authentication enabled for six months — not a breach, but a near-miss that triggered a full security audit. They break down SSH key anatomy, explain why 'ssh-keygen -t rsa -b...

Episode 3 of Linux Server Admin with Fexingo: Sysadmin, Bash, and Server Engineering. Lucas and Luna dive into a classic sysadmin mistake: letting logs fill up the root partition. Lucas explains how unbounded logging by a single chatty service took down a mid-size e-commerce platform for three hours last year, and why a dedicated log partition with proper rotation is the fix. He walks through part...

Lucas and Luna dive into the story of systemd, the init system that replaced SysVinit and Upstart across nearly every major Linux distribution. They walk through the specific boot-time problem systemd solved—parallel service startup versus the old sequential model—and unpack a concrete example: how a modern Fedora system boots from UEFI to a login prompt in under 10 seconds while an equivalent Sys...

In this first episode of Linux Server Admin with Fexingo, Lucas and Luna dive into a real-world incident at a mid-sized e-commerce company where a single typo in a deployment script — a missing dash in a rm command — took down the entire production fleet for 47 minutes. They walk through the timeline: what happened, how the team detected it via a sudden spike in 5xx errors, the immediate rollback...