QEMU not booting my image Post: 302484866

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Special Forums Hardware Filesystems, Disks and Memory QEMU not booting my image Post 302484866 by Corona688 on Monday 3rd of January 2011 01:13:37 PM

01-03-2011

Registered User

Quote:

Originally Posted by neur0n

ok I found these step on how to make a bootable image:

Code:

$ cd /usr/lib/grub/i386-pc
$ dd if=stage1 of=image.img bs=512 count=1
1+0 records in
1+0 records out
$ dd if=stage2 of=image.img bs=512 seek=1
153+1 records in
153+1 records out
$

But is this correct

Sort of. You didn't need to create image.img in the current directory, and probably shouldn't, and didn't need to run any of that as root. It also only creates a 105KB file, not a 1440KB file, so I'd modify it a little:

Code:

cd /usr/lib/grub/i386-pc
# make a completely blank disk image
dd if=/dev/zero of=~/image.img bs=512 count=2880
# copy the boot sector onto it.  "conv=notrunc" tells it not to shrink the file.
dd if=stage1 of=~/image.img conv=notrunc bs=512
# copy stage2 onto it
dd if=stage2 of=~/image.img conv=notrunc seek=1 bs=512

My system has them in /lib/grub/, not /usr/lib/grub incidentally, but systems do differ. "bs=512" is redundant since dd defaults to that but it doesn't hurt anything.

Quote:

and if it is will I be able to freely add files afterwards?

It contains no filesystem, there's nothing to add files to. It would only boot to a grub prompt.

But it should almost certainly be a valid boot disk image, with which you can test qemu.

---------- Post updated at 12:13 PM ---------- Previous update was at 12:05 PM ----------

[edit] the below instructions didn't work because the grub utility can't install on a floppy that way. argh.

Last edited by Corona688; 01-03-2011 at 02:33 PM..

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LEARN ABOUT CENTOS

qemu-nbd

QEMU-NBD(8)															       QEMU-NBD(8)

NAME

       qemu-nbd - QEMU Disk Network Block Device Server

SYNOPSIS

       usage: qemu-nbd [OPTION]...  filename

DESCRIPTION

       Export QEMU disk image using NBD protocol.

OPTIONS

       filename
	    is a disk image filename

       -p, --port=port
	     port to listen on (default B<1024>)

       -o, --offset=offset
	     offset into the image

       -b, --bind=iface
	     interface to bind to (default B<0.0.0.0>)

       -k, --socket=path
	     Use a unix socket with path I<path>

       -r, --read-only
	     export read-only

       -P, --partition=num
	     only expose partition I<num>

       -s, --snapshot
	     use snapshot file

       -n, --nocache
       --cache=cache
	     set cache mode to be used with the file.  See the documentation of
	     the emulator's C<-drive cache=...> option for allowed values.

       --aio=aio
	     choose asynchronous I/O mode between B<threads> (the default)
	     and B<native> (Linux only).

       --discard=discard
	     toggles whether I<discard> (also known as I<trim> or I<unmap>)
	     requests are ignored or passed to the filesystem.	The default is no
	     (B<--discard=ignore>).

       -c, --connect=dev
	     connect I<filename> to NBD device I<dev>

       -d, --disconnect
	     disconnect the specified device

       -e, --shared=num
	     device can be shared by I<num> clients (default B<1>)

       -f, --format=fmt
	     force block driver for format I<fmt> instead of auto-detecting

       -t, --persistent
	     don't exit on the last connection

       -v, --verbose
	     display extra debugging information

       -h, --help
	     display this help and exit

       -V, --version
	     output version information and exit

SEE ALSO

       qemu-img(1)

AUTHOR

       Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.  This is free software; see the source for copying conditions.  There is NO
       warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

								    2014-06-10							       QEMU-NBD(8)