All,
I need to create some images that pygrub can boot (on FC6 & RHEL5). IIUC,
that means that the image file must be a disk image complete with partition
table.
The trouble I'm running into is figuring out how to access the "partition"
within the disk image file as a block device. This is necessary in order to
format or mount the filesystems and run mkswap for the disk image's swap
partition.
Here's what I have so far.
1. Create the disk image file, ala "dd if=/dev/zero
of=/var/lib/xen/images/someVM/sda bs=1k seek=4608k count=1"
2. Create partitions with fdisk (this requires setting the number of
cylinders, but that's easy).
3. losetup /dev/loop0 /var/lib/xen/images/someVM/sda
At this point, I can run "fdisk -l /dev/loop0" and get:
Disk /dev/loop0: 4831 MB, 4831839232 bytes
255 heads, 63 sectors/track, 587 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/loop0p1 1 523 4200966 83 Linux
/dev/loop0p2 524 588 522112+ 82 Linux swap /
Solaris
However, there is no /dev/loop0p1 or /dev/loop0p2 devices and I'm not sure
what to do to make those accessible. I need to be able
to "mke2fs -j /dev/loop0p1" and "mkswap /dev/loop0p2" or equivalent. Then I
need to mount /dev/loop0p1 to copy files to it.
How can I access partitions inside a disk image as block devices? Should I be
using something other than losetup here?
--
Lamont Peterson <lamont@xxxxxxxxxxxx>
Senior Instructor
Guru Labs, L.C. [ http://www.GuruLabs.com/ ]
NOTE: All messages from this email address should be digitally signed with my
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