Configure CentOS/RedHat VMs with Kickstart files on Virtualbox

Kickstart is a type of file that’s used to automatically install RedHat or CentOS Linux on a physical or virtual server. If you are managing more than a few servers, it’s a good idea to configure the servers via kickstart files instead of logging in and configuring each one manually. However, some unfortunate choices were made when defining the Kickstart file format, and it’s not the easiest thing to use. When creating a new Kickstart or making major changes, it’s good to have way to quickly iterate and test your changes. Iterating on a Kickstart file is slow and inconvenient in an enterprise environment in which a freshly booted server obtains an image and Kickstarter file via PXEboot. To speed up Kickstart testing and debugging, I’ve developed a simple way to use Kickstart files with CentOS/RedHat guest virtual machines that run in VirtualBox on my Mac. This process should also work with Windows or Linux hosts.

Continue reading Configure CentOS/RedHat VMs with Kickstart files on Virtualbox

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Warning: CentOS/RedHat 7.4 installs FreeRADIUS 3 with breaking changes

When you run yum upgrade on a CentOS/RedHat 7 instance, you will be upgraded to 7.4. If you have a FreeRADIUS server, you will be upgraded from version 2 to 3, and your server will likely stop authenticating! Good times! Fortunately, the solution was not complicated for us, because we had good documentation.

Symptoms

Your radius server suddenly starts denying logins.

Continue reading Warning: CentOS/RedHat 7.4 installs FreeRADIUS 3 with breaking changes