On 11/07/2012 10:52 AM, Simon Grinberg wrote:
----- Original Message -----
From: "Michal Skrivanek" <[email protected]>
To: [email protected]
Sent: Tuesday, November 6, 2012 10:39:58 PM
Subject: [Engine-devel] SPICE IP override
Hi all,
On behalf of Tomas - please check out the proposal for enhancing our
SPICE integration to allow to return a custom IP/FQDN instead of the
host IP address.
http://wiki.ovirt.org/wiki/Features/Display_Address_Override
All comments are welcome...
My 2 cents,
This works under the assumption that all the users are either outside of the
organization or inside.
But think of some of the following scenarios based on a topology where users in
the main office are inside the corporate network while users on remote offices
/ WAN are on a detached different network on the other side of the NAT / public
firewall :
With current 'per host override' proposal:
1. Admin from the main office won't be able to access the VM console
2. No Mixed environment, meaning that you have to have designated clusters for
remote offices users vs main office users - otherwise connectivity to the
console is determined based on scheduler decision, or may break by live
migration.
3. Based on #2, If I'm a user travelling between offices I'll have to ask the
admin to turn off my VM and move it to internal cluster before I can reconnect
My suggestion is to covert this to 'alternative' IP/FQDN sending the spice
client both internal fqdn/ip and the alternative. The spice client should
detect which is available of the two and auto-connect.
This requires enhancement of the spice client, but still solves all the issues
raised above (actually it solves about 90% of the use cases I've heard about in
the past).
Another alternative is for the engine to 'guess' or 'elect' which to use,
alternative or main, based on the IP of the client - meaning admin provides the
client ranges for providing internal host address vs alternative - but this is
more complicated compared for the previous suggestion
Thoughts?
Lets not re-invent the wheel. This problem has been pondered before and
solved[1], for all scenarios:
internal clients connecting to internal resources;
internal clients connecting to external resources, without the need for
any intermediate assistance
external clients connecting to internal resources, with the need for
intermediate assistance.
VPN clients connecting to internal resources, with or without an
internal IP.
Any other solution you'll try to come up with will bring you back to
this standard, well known (along with its faults) method.
The browser client will use PAC to determine how to connect to the hosts
and will deliver this to the client. It's also a good path towards real
proxy support for Spice.
(Regardless, we still need to deal with the Spice protocol's migration
command of course).
[1] http://en.wikipedia.org/wiki/Proxy_auto-config
Simon.
Thanks,
michal
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