Docker hub recently announced an upcoming request limit to their registry. So in order to reduce the amount of requests issued there, the idea of a caching proxy solution comes to mind. Possible solutions Fortunately there are some projects already working on that problem. However there are different approaches. Some of the projects I found […]
Author: Marcel
In my latest Ubuntu server installation I was aiming for a fully encrypted file system. In order to unlock the file system from remote this requires some extra work – here’s what I found: How does it work? The first obvious question is: If everything is encrypted, how can we even boot up a system? […]
In order to investigate a possible Ubuntu server installation on top of (encrypted) ZFS, I decided to first do this with the desktop version. Reason for that is simple: The desktop version of the installer contains an option to install on a root ZFS volume (guess what: the server version does not). So I started […]
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ZFS feature upgrade
ZFS comes with quite a set of features. However when upgrading zfs, new features are not enabled by default for compatibility reasons. This may be reported by zpool status: In order to get more information about possible new features you can use zpool upgrade: You can add option -v to get more detailed information about […]
Till now I was mainly using mod_auth_mellon in order to do SAML-based authentication for web services. I did so because it seemed quite easy to configure (and the Ubuntu mod_shib package had a nasty bug some years ago when I made first contact with SAML). However mod_shib (part of the shibboleth service provider (SP) implenetation) […]
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Unattended Ubuntu ISO
I recently built an unattended installation ISO to ease installation of Windows 11 test machines. So why not do the same for Ubuntu? While looking around I found solutions for Ubuntu 20.04 and 22.04. The 22.04 version basically works fine for Ubuntu 24.04. Nothing the less some modifications were required: the key server URL was […]
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Unattended Windows ISO
For one or another reason even Linux enthusiasts need a Windows installation from time to time. But with every new version Microsoft adds more and bloatware or privacy violating settings that you need to decline during installation in order to get a halfway usable system. The same is true for forced requirements of TPM or […]
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ZFS and snapshots
One nice feature of filesystems like btrfs of zfs is snapshots. They preserve a certain state of a filesystem without wasting too much space (as long as the modification rate is low). In some cases it is fine to create a snapshot manually from time to time, however on several occasions I wished I had […]
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Wifi-Calling & firewall fun
I had observed odd firewall log entries from my cell phone and now I finally found some time to look into it. So here are my findings – maybe they help someone out there 😉 Traces in firewall logs So what did I observe: First of all my firewall complained about certain connections from my […]
What is IEEE 802.1X anyway? More and more companies run a shared desk strategy. Combined with the possibility of home office this often means that employees use their laptop both at home and at the office. The shared desk strategy however forces them to work at different work spaces (and connect to different network ports […]