[one-users] Problems with qcow2 images

Thu Feb 3 06:54:03 PST 2011

Hi, Javier.

I have double checked, that the root has access to both disk.0 and to 
the base image from the hosting node. It is apparently not a problem. 
What could be the difference between the qcow2 images booting and the 
raw images booting from the access rights perspective? The raw images 
are starting fine.

Best,
Alex

-------- Original Message --------
Subject: 	Re: [one-users] Problems with qcow2 images
Date: 	Wed, 26 Jan 2011 15:41:51 +0100
From: 	Alexander Fedulov <alexander.fedulov at fokus.fraunhofer.de>
To: 	users at lists.opennebula.org

I have modified the nfs exports on my ON manager host by adding
no_root_squash:
     /srv/cloud      192.168.144.21(rw,no_root_squash)
     /srv/cloud      192.168.144.22(rw,no_root_squash)

- no changes, the same error:
     qemu: could not open disk image
/srv/cloud/one/var//41/images/disk.0: Permission denied

Permissions of the disk.0 before the failure seem to be fine:
     -rw-rw-rw- 1 oneadmin cloud 262144 2011-01-26 15:29 disk.0

During the deployment, before disk.0 was erased, I was able to access
the disk image from the executing host as root.
     root at brandy:/var/log/libvirt/qemu# qemu-img info
/srv/cloud/one/var/41/images/disk.0
     image: /srv/cloud/one/var/41/images/disk.0
     file format: qcow2
     ...

I am really stuck and hope for your help. Many  thanks in advance.

Yours sincerely,
Alexander

On 24.01.2011 15:00, Alexander Fedulov wrote:
>  Here are permissions for the image and for the base image:
>>  -rw-r--r--  1 oneadmin cloud     262144 2011-01-20 19:23 qcow.img
>>  -rw-r--r--  1 oneadmin cloud 2147483648 2010-11-19 12:22 ubuntu10-04.img
>
>  ...and for the folders (/srv/cloud/temp and up):
>
>>  drwxr-xr-x  3 oneadmin cloud       4096 2011-01-24 14:32 .
>>  drwxr-xr-x 12 oneadmin cloud       4096 2011-01-18 12:01 ..
>
>
>  These are the permissions for disk.0 before it is deleted due to failure:
>>  -rw-rw-rw- 1 oneadmin cloud 262144 2011-01-24 14:45 disk.0
>
>  Any thoughts?
>
>  On 24.01.2011 12:10, Javier Fontan wrote:
>>  Is /srv/cloud/temp/ubuntu10-04/qcow.img readable by root? It needs to
>>  be readable by root in the execution node. Also check the permissions
>>  in for the directories where it is stored.
>>
>>  tm_clone.sh should have changed permissions for
>>  "/srv/cloud/one/var//24/images/disk.0" check if that is correct. root
>>  is the user that is accessing these files but with NFS sharing you
>>  have to give the permissions for all or add no_root_squash to the
>>  exporting parameters.
>>
>>  On Thu, Jan 20, 2011 at 8:17 PM, Alexander Fedulov
>>  <alexander.fedulov at fokus.fraunhofer.de>   wrote:
>>>  I created a qcow2 image from a raw image like this:
>>>>  qemu-img create -f qcow2 -b ubuntu10-04.img qcow.img
>>>  The DISC section of of my deployment descriptor looks like this:
>>>>  DISK   = [
>>>>    source   = "/srv/cloud/temp/ubuntu10-04/qcow.img",
>>>>    target   = "sda",
>>>>    readonly = "no" ,
>>>>    DRIVER = qcow2]
>>>  I have edited the ~/lib/tm_commands/nfs/th_clone.sh file according
>>>  to this
>>>  https://support.opennebula.pro/entries/348847-using-qcow-images
>>>  without the
>>>  SSH part:
>>>
>>>>  *)
>>>>      log "Cloning $SRC_PATH"
>>>>      exec_and_log "qemu-img create -f qcow2 -o backing_file=$SRC_PATH
>>>>  $DST_PATH"
>>>>      ;;
>>>>  esac
>>>  Unfortunately deployment fails and this is what I find in the one-*.log
>>>  files in the /var/log/libvirt/qemu folder of a target host.
>>>
>>>>  LC_ALL=C
>>>>  PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin
>>>>  QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.12 -enable-kvm -m 768
>>>>  -smp 1
>>>>  -name one-24 -uuid 9f3d9ed7-d17f-e6d1-d997-5fed5a84aa47 -chardev
>>>>  socket,id=monitor,path=/var/lib/libvirt/qemu/one-24.monitor,server,nowait
>>>>
>>>>  -monitor chardev:monitor -no-acpi -boot c -drive
>>>>  file=/srv/cloud/one/var//24/images/disk.0,if=scsi,index=0,boot=on,format=qcow2
>>>>
>>>>  -drive
>>>>  file=/srv/cloud/one/var//24/images/disk.1,if=scsi,media=cdrom,index=2,format=raw
>>>>
>>>>  -net nic,macaddr=02:00:c0:a8:90:22,vlan=0,name=nic.0 -net
>>>>  tap,fd=54,vlan=0,name=tap.0 -serial none -parallel none -usb -vnc
>>>>  0.0.0.0:20
>>>>  -k de -vga cirrus
>>>>  qemu: could not open disk image /srv/cloud/one/var//24/images/disk.0:
>>>>  Permission denied
>>>  Deployment of raw images works fine. The version of ON is 2.0.1.
>>>
>>>  I was wondering, whether there is some chmod operation that has to
>>>  be added
>>>  to the tm_clone.sh script or is the problem in something else?
>>>
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>>>  Users at lists.opennebula.org
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>>>
>>
>>
>
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