[virt-tools-list] what is virt-viewer intended to be ?

[Lentes, Bernd]

----- On May 16, 2017, at 12:53 PM, Bernd Lentes bernd.lentes at helmholtz-muenchen.de wrote:


> 
> Hi guys,
> 
> thanks for your quick answer. I have some further questions. I will leave
> windows and try to connect to libvirt or guest consoles from a linux box.
> My scenario is that i have a few guests which are controlled by pacemaker in a
> two node cluster.
> I'd like to have the ability to connect to the consoles when the guests have
> problems in booting. This way maybe i can identify the problems.
> I don't want to open the libvirt port if possible but connect to libvirt/guest
> consoles using ssh.
> I managed to connect to the hypervisor using virsh and ssh from a remote linux
> box.
> My idea is that i configure in each guest a vnc display with increasing port
> numbers, starting from 5900, so i can connect to each guest indepently,
> and to several concurrently.
> I'd like to bind the vnc display just to the localhost interface because of not
> exposing this port.
> I can connect to the hypervisor with the following: virt-viewer -vc
> qemu+ssh://root@ha-idg-1/system
> Then i get a list of the running guests (currently only one). I choose it, and
> then ... nothing happens :-(
> Virt-viewer says "waiting for display 1...", and i get the following message on
> my terminal:
> "(virt-viewer:810): Gtk-WARNING **: Allocating size to VncDisplay 0x10282f0
> without calling gtk_widget_get_preferred_width/height(). How does the code know
> the size to allocate? "
> 
> This is the output of my shell:
> 
> (virt-viewer:8414): virt-viewer-DEBUG: connecting ...
> (virt-viewer:8414): virt-viewer-DEBUG: Opening connection to libvirt with URI
> qemu+ssh://root@ha-idg-1/system
> Opening connection to libvirt with URI qemu+ssh://root@ha-idg-1/system
> Password:
> (virt-viewer:8414): virt-viewer-DEBUG: initial connect
> (virt-viewer:8414): virt-viewer-DEBUG: notebook show status 0x1950200
> 
> (virt-viewer:8414): Gtk-WARNING **: Theme directory base/ of theme oxygen has no
> size field
> 
> (virt-viewer:8414): virt-viewer-DEBUG: virt_viewer_app_set_uuid_string: UUID
> changed to f08c2f32-fe35-137a-0e9d-fa7485d57974
> (virt-viewer:8414): virt-viewer-DEBUG: notebook show status 0x1950200
> (virt-viewer:8414): virt-viewer-DEBUG: Guest mausdb_vm is running, determining
> display
> Guest mausdb_vm is running, determining display
> (virt-viewer:8414): virt-viewer-DEBUG: Set connect info:
> (null),(null),-1,-1,(null),(null),(null),0
> (virt-viewer:8414): virt-viewer-DEBUG: Guest mausdb_vm has a vnc display
> Guest mausdb_vm has a vnc display
> (virt-viewer:8414): virt-viewer-DEBUG: Guest graphics address is 127.0.0.1:5900
> (virt-viewer:8414): virt-viewer-DEBUG: Set connect info:
> ha-idg-1,127.0.0.1,5900,-1,ssh,(null),root,0
> (virt-viewer:8414): virt-viewer-DEBUG: Error operation forbidden: read only
> access prevents virDomainOpenGraphicsFD
> (virt-viewer:8414): virt-viewer-DEBUG: After open connection callback fd=-1
> (virt-viewer:8414): virt-viewer-DEBUG: Opening indirect TCP connection to
> display at 127.0.0.1:5900
> Opening indirect TCP connection to display at 127.0.0.1:5900
> (virt-viewer:8414): virt-viewer-DEBUG: Setting up SSH tunnel via root at ha-idg-1
> Setting up SSH tunnel via root at ha-idg-1
> (virt-viewer:8414): virt-viewer-DEBUG: notebook show status 0x1950200
> (virt-viewer:8414): virt-viewer-DEBUG: reconnect_poll: 0
> (virt-viewer:8414): virt-viewer-DEBUG: notebook show status 0x1950200
> (virt-viewer:8414): virt-viewer-DEBUG: Insert display 0 0x1897c60
> (virt-viewer:8414): virt-viewer-DEBUG: notebook show status 0x1950200
> Password: (virt-viewer:8414): virt-viewer-DEBUG: Allocated 1024x740
> (virt-viewer:8414): virt-viewer-DEBUG: Child allocate 1024x640
> 
> (virt-viewer:8414): Gtk-WARNING **: Allocating size to VncDisplay 0x1a2a2f0
> without calling gtk_widget_get_preferred_width/height(). How does the code know
> the size to allocate?
> (virt-viewer:8414): virt-viewer-DEBUG: Window closed
> (virt-viewer:8414): virt-viewer-DEBUG: close vnc=0x1a2a2f0
> (virt-viewer:8414): virt-viewer-DEBUG: Not removing main window 0 0x187ec60
> (virt-viewer:8414): virt-viewer-DEBUG: Disconnected
> (virt-viewer:8414): virt-viewer-DEBUG: close vnc=0x1a2a520
> (virt-viewer:8414): virt-viewer-DEBUG: notebook show status 0x1950200
> (virt-viewer:8414): virt-viewer-DEBUG: Guest mausdb_vm display has disconnected,
> shutting down
> Guest mausdb_vm display has disconnected, shutting down
> pc65518:~ #
> Password:
> Password:
> Permission denied (publickey,keyboard-interactive).
> pc65518:~ # pc65518:~ # pc65518:~ #
> 
> 
> Do i have to provide the desired resolution ? How can i do that ?
> I tried virt-viewer with -f, but that didn't help.
> 
> What means "(virt-viewer:8414): virt-viewer-DEBUG: Error operation forbidden:
> read only access prevents virDomainOpenGraphicsFD
> (virt-viewer:8414): virt-viewer-DEBUG: After open connection callback fd=-1" ?
> 
> Is my idea basically possible ? Or is it the problem that vnc is just listening
> on localhost ?

I tested a bit. I'm able to tunnel with ssh a local port to 127.0.0.1 on a remote box.
So i think that's not the problem.

Bernd
 

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