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> -----Original Messages----- > From: "Steven Tardy" <sjt5atra at gmail.com> > Sent Time: 2018-02-26 10:48:48 (Monday) > To: "CentOS mailing list" <centos at centos.org> > Cc: > Subject: Re: [CentOS] How to update modules in iniramfs fastly > > On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui <wuzhouhui14 at mails.ucas.ac.cn> > wrote:

...s not the same format as the original initrd.img that ships with the distro. I would like to know the proper incantation used to package initrd.img Now for the specifics. The original image: http://mirror.steadfast.net/ centos/7.4.1708/os/x86_64/isolinux/initrd.img is extracted: /usr/lib/dracut/skipcpio initrd.img | xzcat | cpio -i -d and after adding the needed udev rule, it gets packed and compressed as follows: find . 2>/dev/null | cpio --quiet -c -o | xz -9 --format=lzma >"~/patched-initrd.img" Now for the difference. FIrst the original distro image: # file initrd.img initr...

...e original initrd.img that ships with the distro. > I would like to know the proper incantation > used to package initrd.img > > Now for the specifics. The original image: http://mirror.steadfast.net/ > centos/7.4.1708/os/x86_64/isolinux/initrd.img > is extracted: /usr/lib/dracut/skipcpio initrd.img | xzcat | cpio -i -d > and after adding the needed udev rule, it gets packed and compressed as > follows: > > find . 2>/dev/null | cpio --quiet -c -o | xz -9 > --format=lzma >"~/patched-initrd.img" > > Now for the difference. FIrst the original dis...

...lutions/24029). i think you have that backwards ... mkinitrd is simply a wrapper around a call to dracut, which builds an initramfs. > This solution does not work in CentOS 7, because initramfs in CentOS > 7 is not a gzipped cpio: it is, but to get to the content, you need to use "skipcpio" to jump over the initial tiny cpio archive. see, for example: https://sites.google.com/site/syscookbook/rhel/rhel-kernel-rebuild rday