[libvirt-users] Libvirt: dynamic ownership did not work

[Jonatan Schlag]

Am Do, 4. Aug, 2016 um 1:38 schrieb Michal Privoznik 
<mprivozn at redhat.com>:
> On 04.08.2016 12:12, Jonatan Schlag wrote:
>> 
>> 
>>  Am Do, 4. Aug, 2016 um 11:32 schrieb Michal Privoznik
>>  <mprivozn at redhat.com>:
>>>  On 03.08.2016 21:17, Jonatan Schlag wrote:
>>>>   Hi,
>>>>   I have a very strange problem with libvirt. I work on some 
>>>> machines
>>>>  with
>>>>   libvirt (Debian/ Arch Linux) and libvirt set the ownership of 
>>>> images
>>>>   file automatically to the qemu user / group for example on Arch
>>>>  Linux to
>>>>   nobody:kvm.
>>>>   So when I copy an image file with root and use I then with qemu,
>>>>  libvirt
>>>>   change the owner/ group to nobody:kvm.
>>>> 
>>>>   But I also compiled libvirt for a machine (gcc 4.9.4 glibc 2.12) 
>>>> and on
>>>>   this machine libvirt did not change the ownership of the image 
>>>> files
>>>>   which results in this error:
>>>> 
>>>>   libvirtError: internal error: process exited while connecting to
>>>>   monitor: able-ticketing,seamless-migration=on -device
>>>> 
>>>>  
>>>> qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,bus=pci.0,addr=0x2
>>>> 
>>>>   -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device
>>>>   hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev
>>>>   spicevmc,id=charredir0,name=usbredir -device
>>>>   usb-redir,chardev=charredir0,id=redir0 -device
>>>>   virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -msg 
>>>> timestamp=on
>>>>   2016-08-03T18:19:47.494512Z qemu-system-x86_64: -drive
>>>> 
>>>>  
>>>> file=/data/hdd1/libvirt/images/test.img,format=raw,if=none,id=drive-virtio-disk0:
>>>> 
>>>>   Could not open '/data/hdd1/libvirt/images/test.img': Permission 
>>>> denied
>>> 
>>>  Can you please share the debug logs?
>>> 
>>>  http://wiki.libvirt.org/page/DebugLogs
>>> 
>>>  Also, my initial suspect, before diving any deeper is that 
>>> usually, when
>>>  users compile libvirt on their own, they forget to set the correct
>>>  prefix, therefore libvirt is looking for its config files NOT under
>>>  /etc/libvirt but /usr/local/etc/ or whatever.
>>> 
>>>  BTW: is the daemon running under root?
>>> 
>>>  Michal
>> 
>>  Hi,
>> 
>>  The daemon runs under root.
>> 
>>  I uploaded the debug logs to:
>> 
>>  http://people.ipfire.org/~jschlag/1363864/1_libvirtd.log
>> 
>>  The UID of the user nobody is 99, the GID of the group kvm is 1011.
>> 
>>  I added my configure options to the bug report.
>> 
>>  Following the log the ownership is changed but why is the file still
>>  owned by root:root?
> 
> Right. the file is set ownership.
But the file ist still owned by root:root and so it is not accessable 
by qemu as nobody:kvm. In the moment the only possible way is that the 
change of the ownership fail, but then there should be an error 
message, but there is no error message in the log.

> One thing though - libvirt does not
> label the whole path, just the file. So maybe you should check whether
> nobody:kvm has access into the /data/hdd1/libvirt/images dir (and also
> each one in the path).

When is set the ownership manually to nobody:kcm qemu is able to acces 
the fail so i think nobody:kvm has access to each folder in the path
> 
> 
> What about apparmor? In the bug report you say that selinux is 
> disabled,
> but what about apparmor?

apparmor is also disabled or better it is like se linux not installed.
> 
> 
> Michal
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