Harald Hoyer - Fedora

Bye bye Fedora - Hello NixOS

Harald Hoyer — Fri, 27 Oct 2023 00:00:00 +0000

After over twenty years of using Red Hat and Fedora, it’s time to move on to explore other possibilities. Although my secure boot laptop still uses VerityBook</a>, which is based on Fedora, my other machines are now running NixOS</a>.

varlink for dnf - a Showcase

Harald Hoyer — Thu, 22 Feb 2018 07:09:03 +0000

On the varlink wiki page</a> I showcase how to add varlink to a python project. In this case, I chose DNF, the rpm package manager of Fedora.

dracut and CVE-2016-4484: Cryptsetup Initrd root Shell

Harald Hoyer — Tue, 15 Nov 2016 16:42:23 +0000

People who want to secure their Fedora/RHEL system have to:

add a BIOS password</li>
add a grub password</li>
add “rd.shell=0” to the kernel command line</li> </ul>
Anaconda does add “rd.shell=0” to the kernel command line automatically, if you setup the bootloader with a password.
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GPG, Smartcard and ssh

Harald Hoyer — Thu, 21 Jul 2016 14:35:14 +0000

This blog post shows how to tweak Fedora, if you want to use a smartcard with OpenPGP and use it also as a ssh key. It also serves me as a recipe for fresh installations.

libtool: getting rid of 180,000 sed forks

Harald Hoyer — Thu, 05 Mar 2015 08:10:36 +0000

When compiling systemd on rawhide, we noticed a significant slowdown in compile time. Investigating further, it turns out, that libtool forks an incredible amount of sed. Running perf showed 30% of the “make all” was spent in bash. strace showed an execve of sed with the same arguments 180,000 times!!!!!

Single UEFI executable for kernel+initrd+cmdline

Harald Hoyer — Wed, 25 Feb 2015 15:55:16 +0000

Lately Kay Sievers and David Herrmann created a UEFI loader stub</a>, which starts a linux kernel with an initrd and a kernel command line, which are COFF sections of the executable. This enables us to create single UEFI executable with a standard distribution kernel, a custom initrd and our own kernel command line attached.

Self Hosting Fedora Base

Harald Hoyer — Tue, 14 Jan 2014 16:15:52 +0000

If you want to bootstrap a distribution or want to rebuild it from the sources (SRPMS) to get the same binaries (think CentOS), you have to build the build tools and rebuild them with the built build tools, which have to be built with other build tools…

My goal for a self-hosting Fedora Base is to reduce the number of packages to do such a rebuild.

Linux: HOWTO get the number of CPUs

Harald Hoyer — Wed, 13 Nov 2013 12:13:04 +0000

$ </span>getconf</span> _NPROCESSORS_ONLN
</span></code></pre>
returns the number of CPUs online.</p> 
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Fedora Boot Optimization
Harald Hoyer — Wed, 13 Nov 2013 10:12:04 +0000
This article shows how to reduce boot time for Fedora 17, but the recipe can also be applied to 18, 19 and 20.</p>
The target is to get a fast booting system with NetworkManager running and gdm displaying the login
screen as fast as possible.</p> 
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Redirecting apache access_log and error_log to the systemd journal
Harald Hoyer — Thu, 07 Nov 2013 10:03:38 +0000
To redirect all apache messages to syslog, which will then appear in the systemd
journal modify your httpd.conf:</p> 
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dracut - kernel command line
Harald Hoyer — Mon, 04 Nov 2013 18:36:27 +0000
To quickly find out, what dracut wants as the kernel command for your current disk setup,
fire up:</p>
# </span>dracut</span> --print-cmdline
</span></code></pre> Read More