Open resolver issues with Spamhaus – how to check
14 January 2026
3:33 pm
Using a public name server such as 1.1.1.1 or 8.8.4.4 has become the norm, but if you’re running an email server, this may lead to
Knowledgebase
Zabbix Cheat Sheet
16 December 2025
4:24 pm
Background On a Zabbix server, with seemingly defaults, disk space is continuously depleted. I guess it’s poor defaults or I installed it poorly. Either way,
TrueNAS and Proxmox confusion
13 November 2025
2:16 pm
13 November 2025 At first there was only one plugin, then two, then between June and November 2025, it became 4: https://github.com/ondrejbima/freenas-proxmox https://github.com/TheGrandWazoo/freenas-proxmox https://github.com/boomshankerx/proxmox-truenas https://github.com/WarlockSyno/TrueNAS-Proxmox-VE-Storage-Plugin
When you ZFS Pool runs out on Proxmox
5 October 2025
8:45 am
Background When your ZFS pool runs out on Proxmox, your entire host and possibly many of the VMs will crash and stop working. You won’t
5.7.1 Your access to submit messages to this e-mail system has been rejected. Talos Intelligence Cisco Bullshit
4 October 2025
10:00 am
The new kid on the block with their opaque error messages in so called “spam protection” is Cisco Talos Piece of Shit Intelligence. If you
Adventures in leapp upgrade – upgrading a CentOS 7 Virtualmin server to AlmaLinux 9
17 January 2026
Notes on trying to upgrade an old CentOS 7 Virtualmin server using leapp . The point is to keep Virtualmin going and end up with
How to block and and unblock IP addresses using FirewallD
17 January 2026
What is FirewallD? FirewallD (Firewall Daemon) is a nice alternative to iptables but still uses iptables behind the scenes. Yet it’s much simpler and easier
CentOS is out of date – yum upgrade is failing – Fixes for yum update and yum upgrade
16 January 2026
CentOS 7 Is Broken for Upgrade In the last few year RedHat destroyed CentOS 7. Now we’ve moved on to Debian, Ubuntu, and Alma Linux.
Open resolver issues with Spamhaus – how to check
14 January 2026
Using a public name server such as 1.1.1.1 or 8.8.4.4 has become the norm, but if you’re running an email server, this may lead to
Mutt Cheat Sheet
14 January 2026
Background Mutt is a basic Linux terminal based email client. Why Mutt? One might ask why use a terminal based email client when such a