Hi all,
I finally executed KVM VM's with persistent disks in OpenNebula.
I made the following changes in /etc/libvirt/qemu.conf
# The user ID for QEMU processes run by the system instance
user = "oneadmin"
# The group ID for QEMU processes run by the system instance
group = "oneadmin"
# Whether libvirt should dynamically change file ownership
# to match the configured user/group above. Defaults to 1.
# Set to 0 to disable file ownership changes.
dynamic_ownership = 1
Oneadmin and libvirt-qemu user and group membership are as follows in
KVM worker node:
~# groups oneadmin
oneadmin : oneadmin kvm libvirt
~# groups libvirt-qemu
libvirt-qemu : kvm oneadmin
I changed KVM /dev/kvm group from kvm to oneadmin:
~# chgrp oneadmin /dev/kvm
~# ls -la /dev/kvm
crw-rw---- 1 root oneadmin 10, 232 sep 16 20:35 /dev/kvm
I will need to change group permissions of /dev/kvm to oneadmin in
rc.local because reloading qemu-kvm resets /dev/kvm to kvm group. Do you
know any other way to set up group of /dev/kvm?
Thank you very much everybody for your help and support!
Best Regards,
Alberto Picón
El 26/09/2011 22:45, Ruben S. Montero escribió:
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
<alpic...@gmail.com <mailto:alpic...@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 <tel:25.09.2011%2000>: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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--
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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