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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