On Mon, 26 Feb 2018, wuzhouhui wrote: > > -----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: > > > > > I know dracut can update modules in initramfs, but I think it is too > > > slow. So I'm wondering what is the fastest way to update modules in > > > initramfs of CentOS 7? > > > > > > `dracut` calls `mkinitrd` which rebuilds the initrd file. . . you could do > > it manually but that is prone to errors ( > > https://access.redhat.com/solutions/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