Hello
Anyone used Zebra routing daemon and created virtual routers
before? Is it possible to run OSPF/BGP on each virtual server and get
them to talk to each other?
I''m new to Xen and I need to know... I will be trying this out in the
coming days and I want to know about any pitfalls to avoid.
--
Nonchalantly yours
GobbledeGeek
[Every thing but Gobbledegook.. !!]
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It doesn''t seem to me that you really need to run a routing daemon on each of the virtual servers, unless you want them on different subnets. If you have all the virtual servers on the same subnet, you could just set up a tun/tap inteface on your host O/S and set up the xen-br0 bridge on that interface. Configure your virtual servers and your host server''s tap0 interface on the same subnet, then set up your host server to do routing of some sort or another (either plain routing or NAT). If you do need them on different subnets, then zebra might be the way to go. I''ve messed around with it before, but not in great depth. If you did run Zebra, you would probably need to run it on both the host O/S and all of the VM''s. This would certainly work, but, unless you have a good reason for having each of the VM''s on a different subnet, it''s probably best to keep them all in one place. Nick Couchman Systems Integrator SEAKR Engineering, Inc. 6221 South Racine Circle Centennial, CO 80111 Main: (303) 790-8499 Fax: (303) 790-8720 Web: http://www.seakr.com>>> Gobbledegeek <gobbledegeek@gmail.com> 2005/08/31 23:50:45 >>>Hello Anyone used Zebra routing daemon and created virtual routers before? Is it possible to run OSPF/BGP on each virtual server and get them to talk to each other? I''m new to Xen and I need to know... I will be trying this out in the coming days and I want to know about any pitfalls to avoid. -- Nonchalantly yours GobbledeGeek [Every thing but Gobbledegook.. !!] _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Gobbledegeek wrote:> Hello > Anyone used Zebra routing daemon and created virtual routers > before? Is it possible to run OSPF/BGP on each virtual server and get > them to talk to each other? > I''m new to Xen and I need to know... I will be trying this out in the > coming days and I want to know about any pitfalls to avoid. >Yes, I''ve done this to provide small "units" that can be individually traffic shaped more easily and also heartbeat used to fail over between live parallel domUs. The bad news is that at least on Fedora core 4 the network stalling issue described at length here is a significant issue. A domU will lose all its connectivity on all interfaces for up to 20 minutes and then resurrect itself. During this time packets inside the domU are queued and those attempting to get in are dropped. Also the dynamic IRQ count for the vif is frozen during this interval. There is also a packet drop issue (0.1%) on the vifs and that can be reduced by attaching a qdisc and setting up a queue to smooth the input to the vif. Heartbeat mitigates this problem somewhat, but on occasions two sessions can fall over at once... Dave _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On 9/1/05, Nick Couchman <Nick.Couchman@seakr.com> wrote:> If you did run Zebra, you would > probably need to run it on both the host O/S and all of the VM''s. This > would certainly work, but, unless you have a good reason for having each of > the VM''s on a different subnet, it''s probably best to keep them all in one > place. > > Nick Couchman > Systems IntegratorHello Nick A general question - Why can''t the VM run software without its host OS running it also? Is this true for all apps? Rgrds _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Sat, Sep 03, 2005 at 12:16:12PM +0530, Gobbledegeek wrote:> Hello Nick > A general question - Why can''t the VM run software > without its host OS running it also? Is this true for all apps?I think he means that in this specific case, if you want domain0 to be able to make use of the routes exported from the domUs, then it''ll need to run a routing daemon of some kind. If that''s not a requirement, though, you can probably just skip it, and configure the routing as you normally would (with a single default route, &c). _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users