[kwlug-disc] Converting a running Linux box to a Virtual Machine

Chris Frey cdfrey at foursquare.net
Sat May 15 01:48:27 EDT 2010


On Sat, May 15, 2010 at 01:39:20AM -0400, William Park wrote:
> > 9) Insert filesystem into a single disk
> > 
> > 	# this will take a while, but preserves sparseness
> > 	cp --sparse=always <(head -c 32256 disk.img ; cat fs.img) finaldisk.img
> > 
> > 	# top up the resulting file
> > 	dd if=/dev/zero of=finaldisk.img count=1 seek=40000000000 bs=1
> 
> Hi Chris,
> 
> I don't understand this last 'dd'.  Why are you writing 1 byte at the
> end?

It's probably a bit over-precaution, but since the original disk.img was
40000000001 bytes when fdisk ran it, I want it to stay that size when
I feed it to qemu.  And after the cp, the result was not 40000000001,
but something less.

- Chris




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