[rhelv6-list] Getting kernel panic using custom initrd image

[solarflow99]

doesn't rhel6 use dracut for the initrd now?


On Tue, Feb 1, 2011 at 3:04 AM, kelvin maxnn <kmaxnn at gmail.com> wrote:
> Hi all,
> sorry for my bad English, in advance.
>
> Since long time,  I have been making custom initrd files for rhel versions
> like RHEL4.X , RHEL5.X and now trying the same for RHEL6.
> Using the original vmlinuz (that comes with RHEL iso) and my custom initrd,
> I used to do pxe booting.
> My custom initrd I used to create something like this, pseudo steps:-
> 1. Create all the necessary / directory hierarchy like /etc, /usr, etc.etc.
> and copy necessary files in that.
> 2. /bin/dd if=/dev/zero of=/tmp/initrd.img bs=1k count=165888 (the value of
> count is based on some custom calculations)
> 3. sbin/mke2fs -b 1024 -q -m0 -F -O none /tmp/initrd.img
> 4. /bin/mount -o loop /tmp/initrd.img /mycustominitrd
> 5. Using /bin/cp --recursive --preserve , I used to copy the custom
> directory hierarchy to /mycustominitrd.
> 6. unmount /mycustominitrd.
> 7. Using "gzip --force" , I used to create initrd image (without using
> mkinitrd or dracut).
> This customized initrd image along with original vmlinuz , I use to so pxe
> booting my machines.
> Up to RHEL5.X, it worked perfectly. But now, it seems that vmlinuz of RHEL6
> expects something  different than RHEL5 vmlinuz.
> When I do pxe booting the machine using RHEL6's vmlinuz and my initrd, it
> takes vmlinuz and initrd through tftp successfully, but after extracting
> initrd, it gives me error as follows:-
> RAMDISK: gzip image found at block 0
> List of all partitions:
> No filesystem could mount root, tried:  iso9660
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(9,1)
>  Pid: 1, comm: swapper Not tainted 2.6.32-71.el6.x86_64 #1
>  Call Trace:
> ............ (please see the screenshot for full details....)
>
> More surprisingly, if I try to use the same initrd with RHEL5 or RHEL4
> vmlinuz it works perfectly.
>
> This is the some of the contents of pxelinux.cfg file:
> KERNEL feb1/vmlinuz
> APPEND ramdisk_blocksize=1024 ramdisk_size=165888 initrd=feb1/initrd.img
> IPAPPEND 3
>
> Also, if I replace my initrd with initramfs of RHEL6 , i get following
> error:-
> dracut: FATAL: No or empty root= argument
> dracut: Refusing to continue
> dracut: FATAL: No or empty root= argument
> dracut: Refusing to continue
>
>
> Signal caught!
>
> Boot has failed, sleeping forever.
>
> Am I missing something in pxe.cfg ?
> Does vmlinuz of RHEL6 expects something more than RHEL5 vmlinuz?
> Can anybody please guide me on this issue?
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