Automatic Host Removal in CheckMK
In CheckMK 2.4 Raw, automatic host removal only applies to hosts classified as vanished by discovery. A CRIT agent/service state…
Hunting the ghost in the machine
A NAS that hard-freezes with no useful logs is frustrating. This post walks through the investigation that led from misleading…
NextCloud notify_push with Redis, systemd, and NGINX (WebSockets)
Set up NextCloud notify_push (Client Push) with Redis, systemd, and an NGINX reverse proxy that supports WebSockets. Includes verification steps,…
The Reverse Proxy, the Mobile Browser, and the “Upgrade” Header
About the Problem: I was having some issue with displaying a simple WordPress site properly on a mobile browser. Not…
AXFR workflows and the BIND backend
How AXFR fits into an internal PowerDNS setup and why the BIND backend can be useful for interoperability and transfer-driven…
Operations and troubleshooting
Validate redundancy, troubleshoot forwarding issues, and fix a common DNSSEC pitfall in a PowerDNS Docker stack.
Deploy Recursor, Authoritative, and PowerAdmin
Deploy an internal-only, redundant DNS stack with PowerDNS Recursor, PowerDNS Authoritative (behind the Recursor on port 5353), and PowerAdmin.
Tuning ZFS Volumes
Below are some parameters I found to improve the speed of my ZFS volumes. zfs set xattr=sa <poolname> zfs set…
GlusterFS Performance improvements
Here is a list of parameters I found over time to improve the speed of my GlusterFS instances. gluster volume…
How to move GlusterFS to a new hostname
While it is rather easy to change the hostname of the Linux box the GlusterFS is sitting, Gluster might not…