> -----Original Messages-----
> From: "Steven Tardy" <sjt5atra@xxxxxxxxx>
> Sent Time: 2018-02-26 10:48:48 (Monday)
> To: "CentOS mailing list" <centos@xxxxxxxxxx>
> Cc:
> Subject: Re: How to update modules in iniramfs fastly
>
> On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui <wuzhouhui14@xxxxxxxxxxxxxxxx>
> 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).
This solution does not work in CentOS 7, because initramfs in CentOS 7 is not
a gzipped cpio:
[root@bogon a]# file /boot/initramfs-3.10.0-693.el7.x86_64.img
/boot/initramfs-3.10.0-693.el7.x86_64.img: ASCII cpio archive (SVR4 with no CRC)
If I use
zcat /boot/initrd-2.6.18-164.6.1.el5.img | cpio -idmv
to uncompress initramfs, it will report errors:
[root@bogon a]# zcat /boot/initramfs-3.10.0-693.el7.x86_64.img | cpio -idmv
gzip: /boot/initramfs-3.10.0-693.el7.x86_64.img: not in gzip format
cpio: premature end of archive
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