Xen users - Jan 2009 - Mount CD ROM iso during kickstart postinstall

Mount CD ROM iso during kickstart postinstall

CentOS 5.2 i386

I''m doing a xen virtual machine installation from a DVD iso image with
a kickstart file to set network and run scripts and such in the postinstall
section.

During the installation the DVD iso is listed as device /tmp/cdrom and mounted
on /mnt/source.  Once the installation is done and the post install starts the
/tmp/cdrom device is unmounted.

Part of my kickstart is copying certain files from the DVD iso to the installed
system but all attempts to re-mount the DVD fail.

/tmp/cdrom is gone once the postinstall portion of the install starts.  On a
real machine I''ve been able to re-mount the DVD in the postinstall
using /dev/cdrom or /dev/hdc but on this virtual machine it does not work.  It
complains of ''No medium found''.

A listing of /dev during the post install shows a valid device of /dev/hdc but
any attempts to mount it in the postinstall portion of kickstart results in
''No medium found''.

After re-boot mounting the DVD iso image works with no problem using /dev/hdc

I need some way of mounting the DVD iso image during the postinstall of the
kickstart.

My config is as follows:

name = "yum"
uuid = "82983ffc-36d6-7272-4ce8-143a516142a7"
maxmem = 256
memory = 256
vcpus = 1
builder = "hvm"
kernel = "/usr/lib/xen/boot/hvmloader"
boot = "c"
pae = 1
acpi = 1
apic = 1
localtime = 0
on_poweroff = "destroy"
on_reboot = "destroy"
on_crash = "restart"
device_model = "/usr/lib/xen/bin/qemu-dm"
sdl = 0
vnc = 1
vncunused = 1
disk = [ "file:/var/xen/images/yum.img,hda,w",
"file:/var/xen/images/yum-cd-10.06.09.iso,hdc:cdrom,r" ]
vif = [ "mac=00:16:3e:64:d3:aa,bridge=vnet1",
"mac=00:16:3e:13:e3:a1,bridge=virbr0" ]
serial = "pty"




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On Tue, Jan 6, 2009 at 12:08 PM, Mac McClellan <mmcclellan@scires.com>
wrote:
> Mount CD ROM iso during kickstart postinstall
>
> CentOS 5.2 i386
>
> I''m doing a xen virtual machine installation from a DVD iso image
with a kickstart file to set network and run scripts and such in the postinstall
section.
>
> During the installation the DVD iso is listed as device /tmp/cdrom and
mounted on /mnt/source.  Once the installation is done and the post install
starts the /tmp/cdrom device is unmounted.
>
> Part of my kickstart is copying certain files from the DVD iso to the
installed system but all attempts to re-mount the DVD fail.
>
> /tmp/cdrom is gone once the postinstall portion of the install starts.  On
a real machine I''ve been able to re-mount the DVD in the postinstall
using /dev/cdrom or /dev/hdc but on this virtual machine it does not work.  It
complains of ''No medium found''.
>
> A listing of /dev during the post install shows a valid device of /dev/hdc
but any attempts to mount it in the postinstall portion of kickstart results in
''No medium found''.
>
Could it simply be that a pause or sleep is needed for the iso to be "read
in"?

Any idea might be to try to manually detach and attach the disk
devices with xm block-detach and xm block-attach.

Hope that helps.

Cheers,
Todd

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com

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>>> "Todd Deshane" <deshantm@gmail.com> 01/06/09 12:47
PM >>>
On Tue, Jan 6, 2009 at 12:08 PM, Mac McClellan <mmcclellan@scires.com>
wrote:
> Mount CD ROM iso during kickstart postinstall
>
> CentOS 5.2 i386
>
> I''m doing a xen virtual machine installation from a DVD iso image
with a kickstart file to set network and run scripts and such in the postinstall
section.
>
> During the installation the DVD iso is listed as device /tmp/cdrom and
mounted on /mnt/source.  Once the installation is done and the post install
starts the /tmp/cdrom device is unmounted.
>
> Part of my kickstart is copying certain files from the DVD iso to the
installed system but all attempts to re-mount the DVD fail.
>
> /tmp/cdrom is gone once the postinstall portion of the install starts.  On
a real machine I''ve been able to re-mount the DVD in the postinstall
using /dev/cdrom or /dev/hdc but on this virtual machine it does not work.  It
complains of ''No medium found''.
>
> A listing of /dev during the post install shows a valid device of /dev/hdc
but any attempts to mount it in the postinstall portion of kickstart results in
''No medium found''.
>
Could it simply be that a pause or sleep is needed for the iso to be "read
in"?

Any idea might be to try to manually detach and attach the disk
devices with xm block-detach and xm block-attach.

===================
Sleep does not work.  I had previously added a 5 minute sleep to the kickstart
to allow me to poke around on a different terminal to discover what what is
mounted and when.  /dev/hdc gets unmounted right at the start of the post
install.

I tried xm block-attach on Dom-0 like this:

xm block-attach yum /var/lib/xen/images/yum-cd-10.06.09.iso /dev/hdc r

and got this error:
Error: Device /dev/hdc (5632, vbd) is already connected.

So it thinks that it is already attached but any attempt to mount it from within
the Dom-U fails with a ''No medium found'' error

To mount I''m using:
# mount -t iso9660 /dev/hdc /mnt/sysimage/mnt/cdrom

Any other ideas?

Mac

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