Re: [CentOS] How is initrd.img packed and compressed?

Mircea Husz wrote:

In order to work around a known upstream bug I needed to add a udev rule to pxeboot initrd.img on CentOS 7.

The process is straightforward: 1 - extract the pxeboot initrd.img to a new directory 2 - add the udev rule needed to fix the bug 3 - pack and compress it back in initrd.img format

Instead of re-creating a new initrd.img, why not just create an 'updates' image that contains your new udev rule and use the 'inst.updates=' pxeboot cmdline option?

I use this to add things to the install image - no need to alter the existing initrd image - if you need more info, let me know

James Pearson