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jwackito
n00b
Joined: 31 Jan 2007
Posts: 27
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 Posted: Thu Apr 08, 2010 1:12 pm Post subject: No parts in /dev/nbd* devices |
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Hi:
I'm trying to mount a qcow2 kvm image file using qemu-nbd in this way
| Code: | | #qemu-nbd --connect=/dev/nbd0 live-lihuen-tests.img |
After that, I'm able to use fdisk to see the partition table from ndb0 device... this is the output of 'p' fdisk command.
| Code: | Disposit. Inicio Comienzo Fin Bloques Id Sistema
/dev/nbd0p1 * 1 2496 20049088+ 83 Linux
/dev/nbd0p2 2497 2610 915705 5 Extendida
/dev/nbd0p5 2497 2610 915673+ 82 Linux swap / Solaris
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But when I try to use mount command to mount /dev/nbd0p1 I get an error message indicating the device doesn't exist.
| Code: | # mount /dev/nbd0p1 /mnt/cdrom
mount: el dispositivo especial /dev/nbd0p1 no existe |
The NBD support is compiled built in the kernel (2.6.32 downloaded manually from kernel.org)
| Code: | zcat /proc/config.gz |grep -i nbd
CONFIG_BLK_DEV_NBD=y |
qemu-nbd version 0.0.1
If you need more information related to this problem, please let me know.
regards and thanks in advance
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Sadako
Advocate
Joined: 05 Aug 2004
Posts: 3792
Location: sleeping in the bathtub
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| Posted: Thu Apr 08, 2010 1:34 pm Post subject: |
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Try running `partx -a /dev/nbd0`, that should create the /dev/nbd0p* device nodes (assuming they are indeed missing from /dev).
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jwackito
n00b
Joined: 31 Jan 2007
Posts: 27
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| Posted: Thu Apr 08, 2010 2:13 pm Post subject: |
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I get this error message
| Code: | # partx -a /dev/nbd0
HDIO_GETGEO: Inappropriate ioctl for device |
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b0nafide
Apprentice
Joined: 17 Feb 2008
Posts: 171
Location: ~/
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| Posted: Mon Sep 19, 2011 5:17 am Post subject: |
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thread revival...
I can mount virtualbox vdi images now!
It works with some of the /dev/nbd devices, but not all of them. On a different distro I can use any of the /dev/nbds
So, it's working fine using /dev/nbd4 on my gentoo box, so I'm keeping it that way for now. But it doesn't make sense.
Here's the script I chucked together to speed things up for me:
| Code: | #!/bin/bash
# vdi mounter v0.0.2 by bonafide a_t martica d_o_t org (sorry about v0.0.1)
# thanks to http://bethesignal.org/blog/2011/01/05/how-to-mount-virtualbox-vdi-image/
#
# requires nbd and qemu
# don't forget to load the nbd module with max_part=8 or so...
# Some important configuration:
nbd="/dev/nbd0" # default network block device
mntdir="/mnt" # folder where mount points will be created (and destroyed)
mountoptions="-o ro" # some paranoia
qemunbdoptions="-r" # ro also (see above)
verbose=0
# wait for fdisk to see partitions
sleepinterval=0.25 # seconds
sleeptimeout=5 # seconds
iterations=`bc <<< "$sleeptimeout / $sleepinterval"`
blather () {
if [ $verbose == 1 ]; then
echo -e -n "$1"
fi
}
stopit () {
qemu-nbd -d $nbd > /dev/null
}
getname () {
partname=$(sed -e "s/\/dev\//`sed -e "s/^.*\///;s/ /_/g" <<< $1`_/" <<< $part)
}
while getopts d:vh options; do
case "$options" in
[?]|h) echo "Usage: $0 [options] [vdi file]"
echo " -d [network block device] default is $nbd"
echo " -v Be verbose."
echo " -h This help text."
exit 1;;
v) verbose=1;;
d) nbd="$OPTARG";;
esac
done
shift $(( OPTIND - 1 ))
if [ "`file $nbd`" == "${nbd}: block special" ]; then
error=0
if ! [ -e "$1" ]; then
echo "VDI file does not exist."
error=1
else
if [ "`qemu-img check "$1" 2> /dev/null; echo $?`" == "1" ]; then
echo "VDI file $1 is invalid."
error=1
fi
fi
if [ $error == 1 ]; then
echo "Quitting."
exit 1
fi
blather "`qemu-img info "$1"`\n"
blather "Attaching image $1 to $nbd "
qemu-nbd $qemunbdoptions -c $nbd "$1"
timeout=0
while [ $timeout -le $iterations ]; do
parts=`fdisk -l $nbd | sed -n -e '/swap\|Extended/d;/^\/dev\//p' | awk '{ print $1 }'`
if [ "$parts" == "" ]; then
timeout=$(( $timeout + 1 ))
blather "."
sleep $sleepinterval
else
break
fi
done
blather "\n"
if [ $timeout -ge $iterations ]; then
blather "Can't attach image $1 to $nbd \n"
stopit
exit 1
fi
for part in $parts; do
getname "$1"
blather "Mounting partition $part on $mntdir/$partname\n"
mkdir $mntdir/$partname
mount $mountoptions $part $mntdir/$partname
done
echo "Done! Press enter to unmount volume(s)."
read somevalue
for part in $parts; do
getname "$1"
blather "Unmounting partition $part\n"
umount $part
rmdir $mntdir/$partname
done
blather "Deattaching image $1 from $nbd ... "
stopit
blather "Finished.\n"
exit 0
else
echo "$nbd is not a block device?"
fi
exit 1 |
If anybody has run into a similar problem with nbd or has any suggestions I'm all ears. I have no idea what would cause some, but not all of the nbd devices to work with qemu-nbd ...
Edit: | Code: |
# ls -l /dev/nbd*
brw-rw---- 1 root disk 43, 0 Sep 18 12:29 /dev/nbd0
brw-rw---- 1 root disk 43, 32 Sep 18 12:29 /dev/nbd1
brw-rw---- 1 root disk 43, 320 Sep 18 12:29 /dev/nbd10
brw-rw---- 1 root disk 43, 352 Sep 18 12:29 /dev/nbd11
brw-rw---- 1 root disk 43, 384 Sep 18 12:29 /dev/nbd12
brw-rw---- 1 root disk 43, 416 Sep 18 12:29 /dev/nbd13
brw-rw---- 1 root disk 43, 448 Sep 18 12:29 /dev/nbd14
brw-rw---- 1 root disk 43, 480 Sep 18 12:29 /dev/nbd15
brw-rw---- 1 root disk 43, 64 Sep 18 12:29 /dev/nbd2
brw-rw---- 1 root disk 43, 96 Sep 18 12:29 /dev/nbd3
brw-rw---- 1 root disk 43, 128 Sep 18 21:40 /dev/nbd4
brw-rw---- 1 root disk 43, 160 Sep 18 12:29 /dev/nbd5
brw-rw---- 1 root disk 43, 192 Sep 18 12:29 /dev/nbd6
brw-rw---- 1 root disk 43, 224 Sep 18 12:29 /dev/nbd7
brw-rw---- 1 root disk 43, 256 Sep 18 12:29 /dev/nbd8
brw-rw---- 1 root disk 43, 288 Sep 18 12:29 /dev/nbd9
# qemu-nbd --version
qemu-nbd version 0.0.1
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After poking around some more it appears that nbd0-3 and nbd5 don't work, but the rest do???
Cheers
Last edited by b0nafide on Tue Sep 20, 2011 2:30 am; edited 3 times in total |
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b0nafide
Apprentice
Joined: 17 Feb 2008
Posts: 171
Location: ~/
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| Posted: Tue Sep 20, 2011 1:49 am Post subject: |
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Further observations:
All the /dev/nbd devices work with qemu-0.14.0 on another gentoo box with the same kernel sources. |
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b0nafide
Apprentice
Joined: 17 Feb 2008
Posts: 171
Location: ~/
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| Posted: Tue Sep 20, 2011 2:14 am Post subject: |
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This problem is fixed when using qemu >= 0.14.0
Well, it works now! |
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marsark
n00b
Joined: 29 Sep 2008
Posts: 34
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| Posted: Thu Jan 12, 2012 11:55 am Post subject: |
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Hi, I have also this problem with missing partitions in /dev on nbd device. I'm using nbd-client from sys-block/nbd. After connection I'm able to see partitions in the fdisk. But missing in /dev/nbd0*.
I have tried to create them with partx, but no success.
| Code: |
partx -a /dev/nbd0
partx: /dev/nbd0: error adding partition 1
partx: /dev/nbd0: error adding partition 3
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Block device has following structure:
| Code: |
Disk identifier: 0xddde93b1
Device Boot Start End Blocks Id System
/dev/nbd0p1 * 63 60597179 30298558+ 83 Linux
/dev/nbd0p3 60597180 625137344 282270082+ 83 Linux
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What's wrong? |
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nativemad
Developer
Joined: 30 Aug 2004
Posts: 918
Location: Switzerland
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| Posted: Tue Mar 20, 2012 3:30 pm Post subject: |
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I've got the same problem just now...
It worked correctly with nbd as module and "modprobe nbd max_part=16".
Cheers
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