Posts
Page 46 of 53
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Ventoy: Boot Any OS, Any Time
Ventoy turns any USB drive into a multi-boot drive — drop ISOs on it and boot any OS without re-flashing the drive each time.
14 min read -
Bash Strict Mode: set -euo pipefail Explained
set -euo pipefail makes your bash scripts fail fast instead of silently. Here's what each flag does and why they matter.
5 min read -
The sudoers Mistake Everyone Makes Once
Never edit /etc/sudoers directly. One syntax error locks everyone out. Use visudo, understand NOPASSWD risks.
5 min read -
Why Your TLS Certificate Isn't Trusted
Incomplete cert chains, wrong order, self-signed certs. How to diagnose trust failures with openssl s_client.
5 min read -
jq One-Liners Every Sysadmin Needs
jq is JSON on the command line. Here are 5 one-liners that actually solve real problems: filtering, extracting, transforming, combining, and debugging.
5 min read -
Certificate Expiry: Monitor Before the 3 AM Call
Certs expire silently. Check expiry with openssl, automate renewal checks with cron, get alerts before disaster.
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xargs vs while read: Which One and When
xargs and while read both loop over input, but they handle arguments, signals, and performance differently. Here's when to use each.
5 min read -
Where Environment Variables Actually Live in Linux
Navigate /etc/environment, ~/.bashrc, ~/.profile, and systemd Environment=. When to use each.
6 min read -
The Firewall Rule Order That's Breaking Your Setup
Firewall rules are evaluated top-down, first match wins. One misplaced ALLOW rule above your denials silently defeats all your security. Here's the fix.
5 min read -
Sticky Bit, Setuid, Setgid: Linux Special Permissions Explained
Understand sticky bit, setuid, and setgid: what they do, how to set them, security implications, and real-world use cases.
6 min read -
Is fail2ban Actually Working? Here's How to Check
Verify fail2ban is protecting you: check jails, test bans, monitor logs, common misconfiguration, and unban IPs when needed.
6 min read -
Diagnosing Slow Linux Boot with systemd-analyze
Your Linux box takes forever to boot? systemd-analyze shows exactly which services drag it down. Read blame, critical-chain, plot, and fix the slow ones.
6 min read
