Blog
This is (or will become) my blog. I intend to write about technical things that I consider useful to others working on the same topics as I do. As most (useful) documentation about technical things is in English, I will write in English.
I appreciate comments. The usual restrictions apply: don’t be a putz. To leave a comment you must be registered and provide a working mail address. All comments will be moderated. You may comment in German or English.
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UEFI boot Debian without “debian” boot entry
In yesterdays post Install Debian on RAID1 I showed how to install a complete Debian system on software RAID1 (MD RAID, not LVM RAID). During my tests I removed disks and checked if the system still was bootable. As I did not test on bare metal, but on Proxmox, I just had to detach virtual…
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Install Debian on RAID1
There has been a question on Mastodon how to install Debian on software RAID1. This turned out a little more complicated than I initially thought. There are several things to consider: Everything documented here is based on Debian 12.8. So, fire up your Debian installer. Select an expert installation method (text or graphical). When it…
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New Ceph plugin for CheckMK
In my last post I showed you that a bug exists regarding the monitoring of Ceph in CheckMK (at least until 2.3.0p18). Also I reported that an alternate plugin exists and that I will test it. Here are my findings. Installation First you have to remove /etc/check_mk/ceph.cfg and /usr/lib/check_mk_agent/plugins/mk_ceph from all monitored Ceph hosts. It…
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CheckMK bug: wrong “total size” of Ceph pools
In my last post I showed you how to monitor your Proxmox Ceph storage with CheckMK. Let’s have a look. In my home lab I have a 256 GB Ceph pool CEPHPOOL1. As long as it’s empty it looks like this in CheckMK: The total size displayed is only 243 GB, probably due to Ceph…
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Monitor your Proxmox Ceph storage with CheckMK
You have added Ceph storage to your Proxmox servers, but you don’t yet see them in CheckMK. The usual service discovery process doesn’t bring up anything Ceph related. This is because Ceph data is not collected by the CheckMK agent by itself. You need to copy a plugin to the Proxmox server being monitored and…