In this category, you can see all articles related to Unix or Linux operating System.
Security Hardening (SELinux/AppArmor/Auditd) Stop setting SELinux to Permissive just because you are annoyed Technical Briefing | 9/17/2026 We have all been there. You deploy a custom application, the service fails...
Process & Resource Monitoring (Top/Htop/Ps/Systemd) Catching processes that only exist for a split second 🧩 The Challenge Dealing with a recurring cron job or a weird script that crashes so...
Package Management (Apt/Dnf/Pacman Internals) Stop guessing what files your package manager actually left behind 🧩 The Challenge Dealing with a botched package installation is annoying enough, but trying to figure...
Shell Scripting & Automation Stop getting burned by the shell script set -e trap Technical Briefing | 9/17/2026 Every sysadmin eventually learns to start their scripts with set -e to...
SSH & Remote Administration Stop getting locked out when you change your SSH port 🧩 The Challenge You’re hardening a server and decide to move SSH off port 22 to...
Networking & Firewall (Ss/Netstat/Iptables/Nftables/Curl) Ditch netstat for quick tcpdump captures 🧩 The Challenge You’re trying to debug a network issue on a busy server and need to see what’s actually...
Container Basics On Linux (Namespaces/Cgroups) See which process is leaking memory into your cgroups 🧩 The Challenge Dealing with a container that keeps getting killed by the OOM killer even...
User & Group Management Stop hunting for hidden lingering processes after a user logs out 🧩 The Challenge Every once in a while, a developer claims they pushed a script,...
Logging & Journald Stop waiting for logs to flush before you can read them 🧩 The Challenge Everyone has been there, staring at a terminal while an installer or a...
Cron & Task Scheduling (Cron/Systemd Timers/At) Stop guessing why your cron job failed 🧩 The Challenge Ever stared at a cron job entry, knowing it should run, but it just...