History file is a great source of information, either if you do not remember your past actions, or if you are not a single administrator of a system, and you need to figure out what has been performed on it in the past. Unfortunately, history is not a very reliable source of information – the…
RedHat introduced using modules in DNF on RHEL version 8 (and above). This opens very interesting new options, however, sometimes – a quick-n-dirty repo is needed. An example – for offline systems, a repo of already installed packages (on exactly similar system) is created for later use. This used to work well on RHEL version…
After one of the recent updates, a few KVM-based systems could not boot anymore. I am using ZFS for my emulated block devices, and I was happy with that until recently. Now – VMs won’t start, showing the error message in this post’s header. The source of the problem is rather nasty – qemu update…
This is a bit on the less legit side, but a need rose where I was required to update the BIOS on an old SuperMicro SBB server. The thing is – the IPMI, which is fully capable otherwise, did not allow me to update the BIOS using this interface, and the other options were using…
Hi. As some know now, I have an article about encrypting and protecting Linux – while using TPM to prevent the need to enter the encryption passphrase every time the system boots. This is one of the most popular article in this blog, and for a very good reason – people want their computers (especially…
Diving videos tend to be blueish. There are tools to automatically fix it, or at least – enhance the video so that the colours appear more natural. Unfortunately, most of these tools either don’t work well with Linux, or with my phone. After a short investigation, I was able to produce a satisfactory result with…
