How to make a custom ISO image

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ISO remastering

There are scripts to re-build completely custom images, like

alpine-make-vm-image

and the original

mkimg.

If you want to make a customized installer, you need to create .default_boot_services which will cause mkinitfs to create the defaults for the live image.

An alternative

It's possible to commit and load ISO image customizations to and from a writable storage.

Booting an ISO image with local customizations

From a dedicated boot media, obviously.
Directly_booting_an_ISO_file