[CentOS] VNC

Earl Ramirez earlaramirez at gmail.com
Sun Oct 20 03:29:28 UTC 2013


On Sat, 2013-10-19 at 21:18 -0600, Larry Martell wrote:
> On Saturday, October 19, 2013, Earl Ramirez wrote:
> 
> > On Sat, 2013-10-19 at 17:23 -0600, Larry Martell wrote:
> > > On Sat, Oct 19, 2013 at 4:56 PM, Larry Martell <larry.martell at gmail.com
> > >wrote:
> > >
> > > > I had posted last week about trying to get VNC working. I was never
> > > > successful nor were multiple admins. But we realized that all the
> > hosts we
> > > > tried on were VMs. We followed the same procedure (
> > > > http://wiki.centos.org/HowTos/VNC-Server) on a machine with physical
> > HW
> > > > and it worked with no problem. But on the VM I can connect, but I
> > don't get
> > > > any window displayed. Here is what is in the log:
> > > >
> > > > Sat Oct 19 18:39:55 2013
> > > >  vncext:      VNC extension running!
> > > >  vncext:      Listening for VNC connections on all interface(s), port
> > 5902
> > > >  vncext:      created VNC server for screen 0
> > > > GNOME_KEYRING_SOCKET=/tmp/keyring-Y6Tg3c/socket
> > > > SSH_AUTH_SOCK=/tmp/keyring-Y6Tg3c/socket.ssh
> > > > GNOME_KEYRING_PID=19728
> > > > Failed to play sound: File or data not found
> > > >
> > > > ** (nm-applet:19775): WARNING **: <WARN>  request_name(): Could not
> > > > acquire the NetworkManagerUserSettings service.
> > > >   Error: (9) Connection ":1.552" is not allowed to own the service
> > > > "org.freedesktop.NetworkManagerUserSettings" due to security policies
> > in
> > > > the configuration file
> > > >
> > >
> > > Googling that error I found this:
> > > https://bbs.archlinux.org/viewtopic.php?id=63576 and I followed the
> > advice
> > > there. Now I don't get that error, but I still get no display. Now all I
> > > get in the log is this:
> > >
> > >
> > > 19/10/2013 07:14:27 PM [IPv6] Got connection from client
> > > ::ffff:10.250.151.75
> > > 19/10/2013 07:14:27 PM   other clients:
> > > 19/10/2013 07:14:27 PM Client Protocol Version 3.7
> > > 19/10/2013 07:14:27 PM Advertising security type 2
> > > 19/10/2013 07:14:28 PM Client returned security type 2
> > >
> > > My xstartup file is identical on the VM and the physical host.
> > >
> > > Does anyone out there have VNC working on a VM?
> > >
> > >
> > > > 19/10/2013 06:39:59 PM Autoprobing TCP port in (all) network interface
> > > > 19/10/2013 06:39:59 PM Listening IPv{4,6}://*:5900
> > > > 19/10/2013 06:39:59 PM Autoprobing selected port 5900
> > > > 19/10/2013 06:39:59 PM Advertising authentication type: 'VNC
> > > > Authentication' (2)
> > > > 19/10/2013 06:39:59 PM Advertising security type: 'VNC Authentication'
> > (2)
> > > >
> > > > (polkit-gnome-authentication-agent-1:19796): GLib-GObject-WARNING **:
> > > > cannot regster existing type `_PolkitError'
> > > >
> > > > (polkit-gnome-authentication-agent-1:19796): GLib-CRITICAL **:
> > > > g_once_init_leave: assertion `initialization_value != 0' failed
> > > > Initializing nautilus-gdu extension
> > > > Initializing nautilus-open-terminal extension
> > > >
> > > > ** (gnome-panel:19761): CRITICAL **:
> > panel_applet_frame_change_background:
> > > > assertion `PANEL_IS_WIDGET (GTK_WIDGET (frame)->parent)' failed
> > > >
> > > > (polkit-gnome-authentication-agent-1:19796): polkit-gnome-1-WARNING
> > **: No
> > > > icon for themed icon with name 'preferences-system-network-proxy'
> > > > Window manager warning: Buggy client sent a _NET_ACTIVE_WINDOW message
> > > > with a timestamp of 0 for 0x2c00003 (Authentica)
> > > > Window manager warning: meta_window_activate called by a pager with a 0
> > > > timestamp; the pager needs to be fixed.
> > > > Window manager warning: Buggy client sent a _NET_ACTIVE_WINDOW message
> > > > with a timestamp of 0 for 0x2c00003 (Authentica)
> > > > Window manager warning: meta_window_activate called by a pager with a 0
> > > > timestamp; the pager needs to be fixed.
> > > > 19/10/2013 06:40:48 PM [IPv6] Got connection from client
> > > > ::ffff:10.250.151.75
> > > > 19/10/2013 06:40:48 PM   other clients:
> > > > 19/10/2013 06:40:49 PM Client Protocol Version 3.7
> > > > 19/10/2013 06:40:49 PM Advertising security type 2
> > > > 19/10/2013 06:40:49 PM Client returned security type 2
> > > >
> > > >
> > > > Anyone have any clues as to what could be wrong and why it works on a
> > > > physical host and not onI believe that I just find the answer for this
> > question. I have been
> > beating up myself for the last few hours and I was getting the same
> > error that you posted.
> >
> > ****************Test Environment**************
> > 2 Laptops
> > 1 of the two laptop has several linux KVMs
> >
> > **********************************************
> >
> > The reason why you are not able to connect with the KVM Guest is because
> > by default KVM Guest uses VNC, which will conflict with tiger-vncserver.
> >
> > What is your current VM environment, to resolved the issue I switch from
> > VNC to spice for the choice of display for the KVM Guest and I was
> > finally able to establish communication with the KVM guest.
> >
> 
> What exactly did you do to effect this change?

From the KVM Guest, under "Show Virtual Hardware Detail", I change the
type from VNC to Spice from the Display option, which was "Display VNC"
prior to the change.

You don't have to make the change if you don't want to as I was able to
connect to the KVM Guest after it was started with the following command
and the Display was configured for VNC:
$ sudo virsh start KVM_Guest

Once there is no sessions for the KVM that you are connecting to, you
will be fine.

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-- 


Kind Regards
Earl Ramirez
GPG Key: http://trinipino.com/PublicKey.asc
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