How to Extract an initramfs Image and Edit/View it
Last updated on JUNE 15, 2017
Applies to:Linux OS - Version Oracle Linux 5.2 to Oracle Linux 6.5 with Unbreakable Enterprise Kernel [3.8.13] [Release OL5U2 to OL6U5]
initramfs, shortened from "initial RAM file system", it succeeds the older initrd ("initial ramdisk"). It is a cpio archive of the initial file system and gets loaded into memory when Linux starts.
Sometimes it might be necessary to extract all files in an initramfs image the check and verify the contents, additionally it might be necessary to change the content of a file in the image.
This document describes how to extract the files from an initramfs image, how to add files and how to put it back together
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