In this category, you can see all articles related to Unix or Linux operating System.
Networking & Firewalls (Nftables/Iptables/WireGuard) Don’t let your nftables sets blow up when your VPN client restarts Technical Briefing | 9/19/2026 WireGuard is great because it is quiet, but that silence...
Container Basics On Linux (Namespaces/Cgroups) See exactly where your process lives in the namespace hierarchy 🧩 The Challenge Trying to figure out why a process is acting like it’s in...
Disk & Filesystem Management (Du/Df/Lsblk/Fstrim) Stop blindly trusting your filesystem free space report 🧩 The Challenge Ever look at df and see 10 percent disk usage, only to have your...
Performance Tuning & Kernel Parameters (Sysctl) Stop your server from ignoring half your available file handles 🧩 The Challenge Dealing with a production app that randomly craps out with “Too...
Permissions & Security (Chmod/Chown/ACLs/SELinux/AppArmor) Stop fighting over permission bits on shared directories 🧩 The Challenge Setting up a shared directory for a dev team is a nightmare because someone always...
Text Processing (Grep/Sed/Awk) Stop counting columns by hand in awk 🧩 The Challenge You are staring at a massive, messy log file where the column you need is buried somewhere...
Cron & Task Scheduling (Cron/Systemd Timers/At) Stop losing your sanity when cron sends emails to nobody 🧩 The Challenge You finally realize your backup job has been failing silently for...
Backup & Recovery (Rsync/Tar/Dd) Keep your backups consistent without pausing the app 🧩 The Challenge Backing up a live database directory is a recipe for disaster because the files change...
Container Basics On Linux (Namespaces/Cgroups) Stop letting one container starve your whole server of CPU 🧩 The Challenge Dealing with a rogue container that decides to hog every single CPU...
Package Management (Apt/Dnf/Pacman Internals) Stop relying on the package manager to find ghost files 🧩 The Challenge Sometimes you install a package, remove it, and swear the binaries are still...