[one-users] Opennebula 3.0 RC1 and persistent images in KVM VMs

[Ruben S. Montero]

Hi

You may  try to disable dynamic ownership in qemu.conf, as:
...
user = "root"
group = "root"

dynamic_ownership = 0
...

Cheers

Ruben
On Mon, Sep 26, 2011 at 9:52 PM, Alberto Picón Couselo
<alpicon1 at gmail.com>wrote:

> Hi, Fabian.
>
> We have tested root read and write access to NFS mount in KVM worker node
> and it works correctly. As you stated, when we create a persistent image,
> Opennebula creates a link to the registered image in /var/lib/{VID}/image.
> We are using FreeNAS 8.0 Final Release for shared storage and it implements
> NFSv3.
>
> When a new instance is deployed using a persistent image, the image changes
> a quarter of a second to libvirt-bin:kvm file permissions, instance fails to
> boot with "permission denied" error and persistent image in repository
> changes its file permissions to root user and root group.
>
> When we use a non persistent image, KVM instance boots correctly cloning
> the registered image to /var/lib/{VID}/image/disk.0, and it has
> libvirt-bin:kvm file permissions during RUNNING state.
>
> Please, any clue regarding this issue would be really appreciated.
>
> Best Regards,
> Alberto Picón
>
> El 26/09/2011 13:50, Fabian Wenk escribió:
>
>  Hello Alberto
>>
>> On 25.09.2011 00:27, Alberto Picón Couselo wrote:
>>
>>> We have some a problems using persistent KVM images in Opennebula 3.0
>>> RC1.
>>>
>>> Our configuration is as follows:
>>>
>>> Opennebula Front-End Ubuntu LTS 10.04
>>> KVM worker node Debian Queeze 6.0.2
>>> NAS for NFS Shared storage
>>>
>>
>>  Sat Sep 24 23:49:08 2011 [VMM][I]: Command execution fail: 'if [ -x
>>> "/var/lib/one/remotes/vmm/kvm/**deploy" ]; then
>>> /var/lib/one/remotes/vmm/kvm/**deploy /var/lib/one/212/images/**
>>> deployment.0
>>> tc-kvm-hv02 212 tc-kvm-hv02; else                              exit 42;
>>> fi'
>>> Sat Sep 24 23:49:08 2011 [VMM][I]: error: Failed to create domain from
>>> /var/lib/one/212/images/**deployment.0
>>> Sat Sep 24 23:49:08 2011 [VMM][I]: error: internal error process exited
>>> while connecting to monitor: qemu: could not open disk image
>>> /var/lib/one/212/images/disk.**0: Permission denied
>>>
>>
>>  Please, can you give us any clue regarding this issue?. Persistent mode
>>> for KVM VMs is essential for us...
>>>
>>
>> Is root allowed to read/write in the NFS mounted images folder? Check the
>> options in /etc/exports on the NFS server.
>> Eventually you also need to force the client (cluster node) to mount it
>> using NFSv3 (instead of NFSv4).
>>
>> With persistent images, the images stays in the images folder and is only
>> linked from the <vm_id>/images/ folder. KVM does run with root privileges.
>>
>>
>> bye
>> Fabian
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>>
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-- 
Dr. Ruben Santiago Montero
Associate Professor (Profesor Titular), Complutense University of Madrid

URL: http://dsa-research.org/doku.php?id=people:ruben
Weblog: http://blog.dsa-research.org/?author=7
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