Re: Question on how to setup iscsi boot via a menu, to be able to boot disk images and .iso images

Joe Landman wrote:
> Hi folks:

Hello.  You might prefer the gPXE mailing-list at 
http://etherboot.org/mailman/listinfo/gpxe

> Using gpxe without problems as a basic PXE loader, and it is working
> well.  What I want to do is setup menu entries to setup iscsi boot
> from the menu.  I am using memdisk for bios boot updates like this:
>
> LABEL Bios Update
>         kernel memdisk
>         append initrd=biosupdate/16MB-bios-update.img
>

What a minute...  gPXE doesn't use such.  Did you forget to mention 
PXELINUX?  Are you doing gPXE -> PXELINUX?

> What I'd like to do is understand how to do the same thing with iSCSI
> boot.  Say I have a .iso image from a boot CD/DVD.  I'd like to do
> something like this:
>
> LABEL BootCD
>         kernel undionly.kpxe
>         append sanboot scsi:crunch::::iqn.2009-12.jr4:BootCD
>

This looks like you are doing PXELINUX -> gPXE.  Is that so?  If so, I 
think you are after my cmdline and initrd feature which you could use 
with undionly.lkrn.  The patch is not in main-line yet, so you'd have to 
apply it yourself.  Then you could do the following from your PXELINUX 
config-file:

LABEL BootCD
    KERNEL undionly.lkrn
    APPEND sanboot iscsi:crunch::::iqn.2009-12.jr4:BootCD

Note ".lkrn" instead of ".kpxe" and the "i" added before "scsi".  The 
patch is here: 
http://git.etherboot.org/?p=people/sha0/gpxe.git;a=shortlog;h=refs/heads/lkrn_initrd-sha0

Also note that this will yield the exact same results as if you DD your 
.ISO file to an HDD and try to boot the HDD (it's not going to work).  A 
sector-size of 512 bytes will be used and an appropriate MBR-style 
boot-loader would be expected, not a typical El Torito .ISO.  Currently, 
you could have an HDD image with a single partition with your .ISO as a 
file inside the filesystem on that partition.  If you install GRUB4DOS 
onto this HDD, you can use it to map the .ISO as a virtual CD-ROM drive.

grub> root (hd0,0)
grub> map /bootcd.iso (hd32)
grub> map --hook
grub> root (hd32)
grub> chainloader +1
grub> boot

- Shao Miller

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