The kernel primitives, init systems, and tooling behind the world's most-deployed OS.
A distribution-aware UKI workflow covering kernel, initrd, command line, os-release, Secure Boot signing, inspection, rollout, and rollback verification.
How Linux livepatch redirects functions, moves tasks into a consistent patched state, exposes transitions, and fits into-not replaces-kernel maintenance.
A version-aware explanation of Linux Landlock rulesets, handled rights, parent-directory policy, process inheritance, probing, and safe fallback behavior.
A practical reading of Linux PSI totals, some/full averages, cgroup scope, polling triggers, workload correlation, and capacity decisions without guesswork.
A precise guide to Linux seccomp-BPF actions, filter layering, argument limits, no_new_privs, observability, and the controls a real sandbox still needs.
Understand Linux capability sets, exec transitions, file attributes, systemd and container boundaries, with a least-privilege audit workflow.
The correct order of operations for repairing a corrupted Linux filesystem, and what to do when the repair tool reports it can't fix something automatically.
Load average climbs while top shows idle CPU - this usually means processes stuck waiting on I/O, not CPU; here's how to find which one.
The difference between an oops and a full panic, how to read an oops call trace to identify the responsible driver, and when it's safe to ignore.
Recovering a Linux system that panics or hangs during boot right after a kernel or driver update, using boot menu options that don't require external rescue media.