Am Do, 4. Aug, 2016 um 5:07 schrieb Michal Privoznik
<mpriv...@redhat.com>:
On 04.08.2016 13:59, Jonatan Schlag wrote:
Am Do, 4. Aug, 2016 um 1:38 schrieb Michal Privoznik
<mpriv...@redhat.com>:
On 04.08.2016 12:12, Jonatan Schlag wrote:
Am Do, 4. Aug, 2016 um 11:32 schrieb Michal Privoznik
<mpriv...@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.
Then the other option that comes to my mind is a race with somebody
else
on the system. You can attach gdb to the daemon and set breakpoint to
virSecurityDACSetOwnershipInternal(). In the arguments you should see
the path eventually among with uid:gid.
BTW: what's the domain XML?
What did you need the xml file the domain is called test and the image
file is /data/hdd1/libvirt/images/test.img
Michal
I did together with Michael Tremer some debugging and Michael posted
our results in the bugtracker. So it seems that the chown function is
not executed, because a other function return a wrong value.
Maybe the describtion in the bug report hepls to go furhter, when not
say what you need (logs) to debug the problem.
Regards Jonatan
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