[one-users] open /dev/kvm: Permission denied on Debian Squeeze

[Javier Alvarez]

Hello Valentin,

Apparently, when creating a VM as a regular user, the only group that is 
taken into account is the one that appears as 'gid' (oneadmin in this 
case). So what I did to solve the problem was to change the owner of 
/dev/kvm to root.oneadmin.

Best,

Javi

On 25/07/12 11:19, Valentin Bud wrote:
> Hello,
>
> I have recently setup OpenNebula 3.6 on 2 Debian Squeeze boxes. Both 
> machines function as hosts, one of them as frontend.
> I have followed the OpenNebula documentation [1] to setup the KVM 
> driver on the hosts.
>
> ### Host A
>
> # kvm --version
> QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5), Copyright (c) 
> 2003-2008 Fabrice Bellard
>
> # virsh --version
> 0.8.3
>
> # grep -vE '^($|#)' /etc/libvirt/qemu.conf
> user = "oneadmin"
> group = "oneadmin"
> dynamic_ownership = 0
>
> # id oneadmin
> uid=1001(oneadmin) gid=1001(oneadmin) 
> groups=1001(oneadmin),106(kvm),108(libvirt)
>
> # ls -al /dev/kvm
> crw-rw---- 1 root kvm 10, 232 Jul 25 11:23 /dev/kvm
>
> ### Host B
>
> # kvm --version
> QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5), Copyright (c) 
> 2003-2008 Fabrice Bellard
>
> # virsh --version
> 0.8.3
>
> # grep -vE '^($|#)' /etc/libvirt/qemu.conf
> user = "oneadmin"
> group = "oneadmin"
> dynamic_ownership = 0
>
> # id oneadmin
> uid=1001(oneadmin) gid=1001(oneadmin) 
> groups=1001(oneadmin),106(kvm),108(libvirt)
>
> # ls -al /dev/kvm
> crw-rw---- 1 root kvm 10, 232 Jul 25 11:23 /dev/kvm
>
> Doesn't matter on which host the VM gets deployed, the error is the 
> same. The error follows:
>
> LC_ALL=C 
> PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin 
> HOME=/root USER=root LOGNAME=root QEMU_AUDIO_DRV=none /usr/bin/kvm -S 
> -M pc-0.12 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 
> -name one-4 -uuid a7db4cd7-e258-503a-cc57-59d2dc1135ea -nodefaults 
> -chardev 
> socket,id=monitor,path=/var/lib/libvirt/qemu/one-4.monitor,server,nowait 
> -mon chardev=monitor,mode=readline -rtc base=utc -boot c -device 
> lsi,id=scsi0,bus=pci.0,addr=0x5 -drive 
> file=/var/lib/one/datastores/0/4/disk.0,if=none,id=drive-scsi0-0-0,boot=on,format=qcow2 
> -device 
> scsi-disk,bus=scsi0.0,scsi-id=0,drive=drive-scsi0-0-0,id=scsi0-0-0 
> -device 
> rtl8139,vlan=0,id=net0,mac=02:00:0a:41:02:65,bus=pci.0,addr=0x3 -net 
> tap,fd=36,vlan=0,name=hostnet0 -device 
> rtl8139,vlan=1,id=net1,mac=02:00:0a:41:03:65,bus=pci.0,addr=0x4 -net 
> tap,fd=37,vlan=1,name=hostnet1 -usb -vnc 0.0.0.0:4 <http://0.0.0.0:4> 
> -vga cirrus -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6
> open /dev/kvm: Permission denied
> Could not initialize KVM, will disable KVM support
>
> I don't have AppArmor installed or any other tool of this kind. It's 
> just a stock Debian Squeeze install. OpenNebula was compiled on 
> another machine and installed on Host A which is the frontend.
>
> Does anyone of you have any idea about this error? I have Googled 
> around but could not find any answer. Everything seems correct as per 
> OpenNebula KVM documentation [1].
>
> Thank you for your time invested in reading this email. Cheers and 
> Goodwill,
> Valentin Bud
>
> [1]: http://opennebula.org/documentation:rel3.6:kvmg
> -- 
> w: http://ing.enia.re/ <http://databus.ro/blog>
> in: http://www.linkedin.com/pub/valentin-bud/9/881/830
> t: https://twitter.com/valentinbud
>
>
>
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-- 
Javier Álvarez Cid-Fuentes
Grid Computing and Clusters Group
Barcelona Supercomputing Center (BSC-CNS)
Tel. (+34) 93 413 72 46



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