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…
Category: Software
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…
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…
Prevent SSH connection from timing out
In case you are plagued by SSH connections dying in the worst moments and the following waiting period, here might…
Verify all users eMail-Adress over GitLab Rails console
With the release of GitLab 13.2 I ran into a serious issue when logging in. The issues behaviour was, that…
Get random entries in MySQL and MariaDB
If you want to get a random value (or more than one) from a MariaDB or MySQL database, you can…