[one-users] Confused about VNC ports with the KVM hypervisor

[Javier Fontan]

The way to specify VNC ports in OpenNebula is the TCP port, not the
VNC port number. This is passed to libvirt that will convert it to VNC
port (-5900) as this is the way qemu/kvm wants it.

>From libvirt documentation
(http://libvirt.org/formatdomain.html#elementsGraphics):

--8<------
The port attribute specifies the TCP port number
------>8--

>From qemu documentation (http://wiki.qemu.org/download/qemu-doc.html):

--8<------
'host:d'

TCP connections will only be allowed from host on display d. By
convention the TCP port is 5900+d. Optionally, host can be omitted in
which case the server will accept connections from any host.
------>8--






On Thu, Jan 23, 2014 at 7:05 PM, Gerry O'Brien <gerry at scss.tcd.ie> wrote:
>
> Hi,
>
>     I'm a little confused about VNC ports with the KVM hypervisor. From the
> documentation excerpt below I would have expected that the KVM would have
> had -vnc 0.0.0.0:7744 instead of -vnc 0.0.0.0:1844. Below is also the
> Sunstone Graphice part of the template for the Vm.
>     The machine was generated by the OCCI-server. I would like to firewall
> the VM but allow access for ports > 5900 so that users can get access to the
> VNC.
>
>     What is the real port on the host for KVM with -vnc 0.0.0.0:1844?
>
>    Could someone clarify this for me.
>
>         Thanks,
>           Gerry
>
>
>
>
> http://docs.opennebula.org/pdf/4.4/opennebula_4.4_user_guide.pdf
>
> Warning:
> For KVM hypervisor the port number is a real one, not the VNC port. So for
> VNC port 0 you should
> specify 5900, for port 1 is 5901 and so on.
>
>
> GRAPHICS
> LISTEN 0.0.0.0
> PORT 7744
> TYPE vnc
>
>
>
>
>
> oneadmin 26348     1 39 17:48 ?        00:00:27 /usr/bin/kvm -S -M pc-1.1
> -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name one-1844 -uuid
> e570e501-f90e-fcc3-215c-43d0ba828349 -no-user-config -nodefaults -chardev
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/one-1844.monitor,server,nowait
> -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
> -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
> file=/var/lib/one//datastores/103/1844/disk.0,if=none,id=drive-ide0-0-0,format=qcow2,cache=none
> -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1
> -netdev tap,fd=23,id=hostnet0 -device
> rtl8139,netdev=hostnet0,id=net0,mac=02:00:0a:3e:00:04,bus=pci.0,addr=0x3
> -vnc 0.0.0.0:1844 -vga cirrus -device
> virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
>
> --
> Gerry O'Brien
>
> Systems Manager
> School of Computer Science and Statistics
> Trinity College Dublin
> Dublin 2
> IRELAND
>
> 00 353 1 896 1341
>
>
> _______________________________________________
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> Users at lists.opennebula.org
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>



-- 
Javier Fontán Muiños
Developer
OpenNebula - The Open Source Toolkit for Data Center Virtualization
www.OpenNebula.org | @OpenNebula | github.com/jfontan