Welcome to Larvitz Blog! I’m Christian, a Cloud Consultant by day and FreeBSD enthusiast by night, with over 20 years in enterprise IT. Here I write about FreeBSD jails, PF firewalling, self-hosting, Linux system administration, and anything that’s cleanly engineered. Most articles are hands-on guides born from running my own infrastructure, from dual-stack networking and Ansible automation to hosting a Mastodon instance on FreeBSD.

Have a question or want to discuss something? Find me on the Fediverse at @Larvitz@burningboard.net. I’m always happy to chat!

#cloud Articles

Sat 14 March 2026
Linux

Linux Firewalls: How to Actually Secure a Cloud Server (iptables, nftables, firewalld, ufw)

A practical guide to the four major Linux firewall technologies - iptables, nftables, firewalld, and ufw. Covers real-world cloud server hardening with concrete examples, from locking down SSH to building zone-based configurations. Includes an honest comparison and an entirely unbiased opinion about which firewall is actually best.