Tag Archives: Fedora

Converting a disk image to VHD for Azure

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Currently the Fedora projects provides cloud images as qcow2 and raw disk files. Microsoft’s Azure however only supports VHD files. Fortunately qemu-img can convert between those formats: Note that the subformat options fixed and force_size are required for Azure to be able to use the disk image since Azure only supports fixed sized disks.

Running Fedora 27 on Google Compute Engine

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Usually Linux distributions with a long life cycle like RHEL (or its free derivative CentOS), Debian or SLES are the way to go for virtual machines in a cloud environment. But sometimes you need to be a little bit closer to upstream. Maybe because your applications relies on newer version of some packages that are not (easily) available on distributions… Read more »

Updating BIOS firmware via iPXE

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These days mainboards usually come with some sort of wizbang tool that allow the user to update the BIOS from a USB drive or straight via network. Except, of course, that one single mainboard that absolutely needs a new BIOS version on a late Friday afternoon. And obviously the manufacturer only provides a flash tool for DOS and the mainboard… Read more »

Migrating a virtual machine from KVM to ESXi

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Migrating a virtual machine from one host to another is usually no big deal if both hosts run the same VMM. But what if one wants to move a VM from a host running a different hypervisor than the target host? In the case of moving a VM from KVM to ESXi that’s just not (easily) possible. However, one can… Read more »

Change keyboard configuration in console

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To temporarily change a console’s keyboard mapping there’s loadkeys, a little user space program that allows you to alter the kernel’s keyboard mapping. Loading the very handy US International keyboard layout, use To list the currently used keyboard layout or all available keyboard layouts, localectl can be used If localectl is not available, keyboard mapping files are usually found at… Read more »

Pango-WARNING **: failed to choose a font, expect ugly output.

If you try to start a graphical application on a minimal Fedora or CentOS setup, e.g. via ssh -X, you might face the situation that the program actually starts up, but no font appears (or a weird one, or only squares where the letters are supposed to be). If you start a program that uses Pango, like firefox, you get… Read more »

Running PulseAudio as system service

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Running PulseAudio in system mode is usually a bad idea. There are use cases however, where PulseAudio’s system mode is a great tool, e.g. for building a PulseAudio streaming target to stream audio from multiple clients to speakers. First, install PulseAudio, avahi (a free implementation of zeroconf) to publish the service throughout the network and the corresponding PulseAudio module: Since… Read more »

No default route with Fedora’s legacy network service

There’s a bug in Fedora 20 and RHEL 7, where the legacy network service does not set the default route properly. This is due to the fact, that the network service does not evaluate the GATEWAY0 directive in /etc/sysconfig/network-scripts/ifcfg-ethX that is used by NetworkManager. To set the default route with the legacy network service, simply change GATEWAY0 to GATEWAY: Of… Read more »

Setting up an authenticating proxy server with squid3 and pam_auth

While the squid proxy server has quite a few different flavours of authentication available, one of the most basic ones, pam_auth, is also one of the most useful ones to get you started quickly. pam_auth let’s anyone who has a local account access the squid proxy. In large environments you probably want to use ldap authentication eventually, but pam_auth is… Read more »