1:03 p.m.
Francesco Lorenzini <francesco(a)shellrent.com> writes:
Hi Milan,
thank you for your answer.
So there is no other way/workaround? We must wait the fix in the
engine and then upgrade? Maybe a downgrade of libvirt(?).
I can't think about any other workaround, without modifying sources,
than downgrading libvirt, until the fixed Engine is installed.
I was looking up some config file in the host under /etc/libvirt and
found the parameters vnc_password in qemu.conf file. I'm not sure that
setting a password per host in this config file works, casue it is
still passed via xml...
In theory, you could set the default password there and remove passwords
from the domain XMLs using Vdsm hooks. You would have to do it on all
the hosts or handle migrations accordingly. Downgrading libvirt looks
much easier.
> The default VNC password. Only 8 bytes are significant for
> # VNC passwords. This parameter is only used if the per-domain
> # XML config does not already provide a password.
Francesco
Il 14/02/2022 12:41, Milan Zamazal ha scritto:
> francesco--- via Users<users(a)ovirt.org> writes:
>
>> Hi all,
>>
>> I'm using websockify + noVNC for expose the vm console via browser getting
the graphicsconsoles ticket via API. Everything works fine for every other host that I
have (more than 200), the console works either via oVirt engine and via browser) but just
for a single host (CentOS Stream release 8, oVirt 4.4.9) the console works only via engine
but when I try the connection via browser I get the following error (vdsm log of the
host):
>>
>> ERROR FINISH updateDevice error=unsupported configuration: VNC password is 12
characters long, only 8 permitted
>> Traceback (most recent call last):
>> File "/usr/lib/python3.6/site-packages/vdsm/common/api.py", line
124, in method
>> ret = func(*args, **kwargs)
>> File "/usr/lib/python3.6/site-packages/vdsm/API.py", line 372, in
updateDevice
>> return self.vm.updateDevice(params)
>> File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 3389,
in updateDevice
>> return self._updateGraphicsDevice(params)
>> File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 3365,
in _updateGraphicsDevice
>> params['params']
>> File "/usr/lib/python3.6/site-packages/vdsm/virt/vm.py", line 5169,
in _setTicketForGraphicDev
>> self._dom.updateDeviceFlags(xmlutils.tostring(graphics), 0)
>> File "/usr/lib/python3.6/site-packages/vdsm/virt/virdomain.py",
line 101, in f
>> ret = attr(*args, **kwargs)
>> File
"/usr/lib/python3.6/site-packages/vdsm/common/libvirtconnection.py", line 131,
in wrapper
>> ret = f(*args, **kwargs)
>> File "/usr/lib/python3.6/site-packages/vdsm/common/function.py",
line 94, in wrapper
>> return func(inst, *args, **kwargs)
>> File "/usr/lib64/python3.6/site-packages/libvirt.py", line 3244, in
updateDeviceFlags
>> raise libvirtError('virDomainUpdateDeviceFlags() failed')
>> libvirt.libvirtError: unsupported configuration: VNC password is 12 characters
long, only 8 permitted
>>
>>
>> The error is pretty much self explanatory but, I can't manage to
>> figure out why only on this server
> Hi,
>
> this happens with libvirt 8.0.
>
>> and I wonder if I can set the length of the generated vnc password
>> somewhere.
> I don't think so, it must be fixed in Engine. See
>
https://github.com/oVirt/ovirt-engine/commit/a1e7e39348550b575f1f01b70110...
> for more details.
>
> Regards,
> Milan
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