Modify & Rebuild an initrd Image

Let’s assume your image is located at  ./boot-contents/initrd.gz

# Get into an empty directory
mkdir initrd-files
cd initrd-files
# Unpack the image
zcat ../boot-contents/ | cpio -id

Now make whichever changes you need.

# Rebuild the image
find . | cpio --create --format='newc' | gzip  > ../boot-contents/initrd.gz


About andyortlieb

I often find myself figuring out some niche oddities, only to find myself stuck on those same problems a year later due to my wide yet thin activity in certain topics related to my career and hobbies. This blog is where I document these nuances (or nuisances) to ease my pain the second time around, and hopefully that of some other fellow desperate internet scouts.
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