Re: [CentOS] How to update modules in iniramfs fastly

2018-02-26 Thread wuzhouhui 
> -Original Messages-
> From: "Leon Fauster" <leonfaus...@googlemail.com>
> Sent Time: 2018-02-26 22:20:51 (Monday)
> To: "CentOS mailing list" <centos@centos.org>
> Cc: 
> Subject: Re: [CentOS] How to update modules in iniramfs fastly
> 
> 
> > Am 26.02.2018 um 06:46 schrieb wuzhouhui <wuzhouhu...@mails.ucas.ac.cn>:
> > 
> >> -Original Messages-
> >> From: "Steven Tardy" <sjt5a...@gmail.com>
> >> Sent Time: 2018-02-26 10:48:48 (Monday)
> >> To: "CentOS mailing list" <centos@centos.org>
> >> Cc: 
> >> Subject: Re: [CentOS] How to update modules in iniramfs fastly
> >> 
> >> On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui <wuzhouhu...@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).
> > 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
> 
> 
> 
> Maybe some ucode archive is in front of the initrd archive. 
> 
> Did you try to unpack it without uncompressing it? Whats the contents?

[root@bogon a]# cpio  -id < /boot/initramfs-3.10.0-693.el7.x86_64.img 
28 blocks
[root@bogon a]# ls -R
.:
early_cpio  kernel

./kernel:
x86

./kernel/x86:
microcode

./kernel/x86/microcode:
GenuineIntel.bin

Obviously, above is not what I want. In order to get full contents of initramfs,
I have to use skipcpio to skip initial cpio of initramfs:

[root@bogon a]# /usr/lib/dracut/skipcpio 
/boot/initramfs-3.10.0-693.el7.x86_64.img | zcat | cpio -id
85469 blocks
[root@bogon a]# ls
bin  etc   libproc  run   shutdown  sysroot  usr
dev  init  lib64  root  sbin  sys   tmp  var

I can use skipcpio to get full contents of initramfs, and then edit files in it.
But the problem is how to recreate initramfs by extracted contents?

> 
> --
> LF
> 
> 
> 
> 
> 
> 
> 
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Re: [CentOS] How to update modules in iniramfs fastly

2018-02-26 Thread Leon Fauster 

> Am 26.02.2018 um 06:46 schrieb wuzhouhui <wuzhouhu...@mails.ucas.ac.cn>:
> 
>> -Original Messages-
>> From: "Steven Tardy" <sjt5a...@gmail.com>
>> Sent Time: 2018-02-26 10:48:48 (Monday)
>> To: "CentOS mailing list" <centos@centos.org>
>> Cc: 
>> Subject: Re: [CentOS] How to update modules in iniramfs fastly
>> 
>> On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui <wuzhouhu...@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).
> 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



Maybe some ucode archive is in front of the initrd archive. 

Did you try to unpack it without uncompressing it? Whats the contents?

--
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Re: [CentOS] How to update modules in iniramfs fastly

2018-02-26 Thread wuzhouhui 
So, in the end, we can't recreate initramfs of CentOS 7 manually just
like https://access.redhat.com/solutions/24029 did in CentOS 6?

> -Original Messages-
> From: "Robert P. J. Day" <rpj...@crashcourse.ca>
> Sent Time: 2018-02-26 14:05:24 (Monday)
> To: "CentOS mailing list" <centos@centos.org>
> Cc: 
> Subject: Re: [CentOS] How to update modules in iniramfs fastly
> 
> On Mon, 26 Feb 2018, wuzhouhui wrote:
> 
> > > -Original Messages-
> > > From: "Steven Tardy" <sjt5a...@gmail.com>
> > > Sent Time: 2018-02-26 10:48:48 (Monday)
> > > To: "CentOS mailing list" <centos@centos.org>
> > > Cc:
> > > Subject: Re: [CentOS] How to update modules in iniramfs fastly
> > >
> > > On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui <wuzhouhu...@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
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Re: [CentOS] How to update modules in iniramfs fastly

2018-02-25 Thread Robert P. J. Day 
On Mon, 26 Feb 2018, wuzhouhui wrote:

> > -Original Messages-
> > From: "Steven Tardy" <sjt5a...@gmail.com>
> > Sent Time: 2018-02-26 10:48:48 (Monday)
> > To: "CentOS mailing list" <centos@centos.org>
> > Cc:
> > Subject: Re: [CentOS] How to update modules in iniramfs fastly
> >
> > On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui <wuzhouhu...@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
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Re: [CentOS] How to update modules in iniramfs fastly

2018-02-25 Thread wuzhouhui 
> -Original Messages-
> From: "Steven Tardy" <sjt5a...@gmail.com>
> Sent Time: 2018-02-26 10:48:48 (Monday)
> To: "CentOS mailing list" <centos@centos.org>
> Cc: 
> Subject: Re: [CentOS] How to update modules in iniramfs fastly
> 
> On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui <wuzhouhu...@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).
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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Re: [CentOS] How to update modules in iniramfs fastly

2018-02-25 Thread Steven Tardy 
On Sun, Feb 25, 2018 at 8:29 PM wuzhouhui 
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).
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[CentOS] How to update modules in iniramfs fastly

2018-02-25 Thread wuzhouhui 
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?

Thanks!
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