[Libvir] Re: [Xen-users] SOLVED Re: cannot use vncviewer and VMM graphics console to access HVM guest on RHES 5
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Hi Dan,
I'm with you about the VNC authentication.
But I still don't understand the logic behind assigning HVM displays.
Instead of clear "domU ID is the display number" (vncunused 0), the
Virtual Machine Manager assigns vncunused to 1 and then calculates the
5900+ port, I suppose depending on what port is not occupied (BTW
where exactly is this code in the source, please?).
Why is that? And how am I suppose to find out what that port number is
if I'd want to connect to a VMM-created vm manually with my vnc
client?
Thanks,
Glen
Daniel P. Berrange wrote:
On Fri, Jun 01, 2007 at 11:03:36AM -0400, Glen Deem wrote:
> Thanks to Igor Chubin (spasibo) and Richard Jones, the qemu vnc server
> was listening but I did not connect to its proper port (why libvirt
> doesn't use <IP>:<domU id> kind of vnc connection and restricts the
> server to local host only by default?).
VNC authentication is an utter joke. It can be trivially brute forced
so exposing it on a public IP address is not a good idea, hence the
default is 127.0.0.1, though even that's not ideal because it is still
exposed to local users. Ultimately VNC needs to have SSL/TLS support
integrated into it to allow secure access over public network, which
is something I'm working on for QEMU...
Dan.
On Fri, Jun 01, 2007 at 02:13:15PM -0400, Glen Deem wrote:
Hi Dan,
I'm with you about the VNC authentication.
But I still don't understand the logic behind assigning HVM displays.
Instead of clear "domU ID is the display number" (vncunused 0), the
Virtual Machine Manager assigns vncunused to 1 and then calculates the
5900+ port, I suppose depending on what port is not occupied (BTW
where exactly is this code in the source, please?).
Virt-manager doesn't calculate the port numbers - QEMU / Xen does
that - it starts at 5900 and tries to bind() to it, adding 1 and
retrying until it works. 'DomU ID is the display number' doesn't
scale - if your host has been up for a while / run alot of guests
your domU ID get up into the 1000's, 10,000's or more, and you
will easily clash port numbers with other apps on the machine.
Why is that? And how am I suppose to find out what that port number
is
if I'd want to connect to a VMM-created vm manually with my vnc
client?
In current RHEL-5
virsh dumpxml <dom name> | grep graphics
Or in Fedora you can now ask
virsh vncdisplay <doma name>
Dan.
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Daniel P. Berrange -
Glen Deem