How to Use Linux Server Control Groups for Resource Isolation

In episode 99 of Linux Server Admin with Fexingo, Lucas and Luna dive into Linux control groups (cgroups) version 2, a powerful kernel feature for limiting, accounting, and isolating CPU, memory, and I/O usage of processes. They walk through a concrete example: setting up a memory limit on a web server process to prevent an out-of-control PHP-FPM pool from crashing the whole machine. Along the way, they explain the difference between cgroups v1 and v2, show how to inspect cgroup hierarchies using systemd.slice units, and demonstrate persistent configuration via /etc/systemd/system.conf. The discussion also touches on how cgroups enable container runtimes like Docker and Podman. No fluff—just practical server management for sysadmins who need to keep noisy neighbors in check.

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