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On 08/04/2016 07:59 AM, Jonatan Schlag
wrote:
Am Do, 4. Aug, 2016 um 1:38 schrieb Michal Privoznik
<mprivozn@xxxxxxxxxx>:
On 04.08.2016 12:12, Jonatan Schlag wrote:
Am Do, 4. Aug, 2016 um 11:32 schrieb Michal Privoznik
<mprivozn@xxxxxxxxxx>:
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.
Are you checking it after the operation has failed and libvirt has
continued? If libvirt fails to access the file, it will then set
everything back to its original state, so looking at the file
ownership after the fact tells you nothing. If you really want to
see if the file has the proper ownership, you need to attach gdb to
libvirtd and set an appropriate breakpoint.
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