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 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...

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@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/a1e7e39348550b575f1f01b701105f9e1066b09f
for more details.

Regards,
Milan
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		Francesco Lorenzini System Administrator & DevOps Engineer Shellrent Srl Via dell'Edilizia, 19 - 36100 Vicenza Tel. 0444321155 \| Fax 04441492177