$
grep -l "category: opinion" articles/*.txt
Opinion.
Opinion 77 articles
2025·06·15
Configuring UFW Firewall Rules on Ubuntu UFW is the sane front-end to iptables. This tutorial covers default-deny policies, service rules, rate limiting, logging, and the Docker gotcha that breaks all of it.
9 min tutorial
2025·03·18
Installing GoPhish on Ubuntu 24.04 LTS and Configuring DNS for Phishing Simulation Deploy GoPhish with Postfix on Ubuntu, configure SPF, DKIM, DMARC, CAA and SRV records for your sending domains, and import campaign templates.
24 min