Dear Andrew, Fajar
Last week I installed a new server with precisely with xen 3.4.2.
I was used to the old xen 3.0.1 bridge nomenclature, and some some tries
I got to the following:
[root@xxx ~]# more /etc/xen/scripts/network-bridge-multi
#!/bin/bash
# Link physical NIC's to separate bridges
#
dir=$(dirname "$0")
# xen 3.0.1
#"$dir/network-bridge" "$@" vifnum=0 netdev=eth0 bridge=xenbr0
#"$dir/network-bridge" "$@" vifnum=1 netdev=eth1 bridge=xenbr1
#
# xen 3.4.2
"$dir/network-bridge" "$@" vifnum=0 netdev=eth0
"$dir/network-bridge" "$@" vifnum=1 netdev=eth1
[root@xxx ~]# cat /etc/xen/xend-config.sxp
... snip ...
#(network-script network-bridge)
(network-script network-bridge-multi 'start')
Later I added a 3rd bridge intended to be used as a dummy bridge, this
time I used another method, was testing:
[root@labberdaan ~]# cat /etc/rc.local
... snip ...
# creates a logical bridge
brctl addbr eth2
# disables communication with other bridges
brctl stp eth2 off
# sets bridge listening and learning state time to be 0
brctl setfd eth2 0
# activates dummy bridge
ip link set eth2 up
Probably I could this the the above wrapper script ...
Here is a brctl, with 6 VM's running, where domains 1 & 2 use eth0 and
eth2, domains 3 to 5 use eth1 and eth2, and domains 6 only uses the
dummy bridge eth2.
[root@labberdaan ~]# brctl show
bridge name bridge id STP enabled interfaces
eth0 8000.003048c39a44 no vif2.0
vif1.0
peth0
eth1 8000.003048c39a45 no vif5.0
vif4.1
vif3.0
peth1
eth2 8000.feffffffffff no vif6.0
vif5.1
vif4.1
vif3.1
vif2.1
vif1.1
virbr0 8000.000000000000 yes
I noticed that though an ifconfig shows several vif0.X (thus belonging
to dom0), they do not appear in the "brctl show", but dom0 seems to be
in good shape.
I guess it uses the eth0 bridge.
I have to say that this change in the conventions is still a bit
confusing for me ... but I hope that the above setup can give you some
more hints.
Cheers,
N.
Fajar A. Nugraha wrote:
On Sun, Apr 4, 2010 at 11:08 PM, Andrew Kilham<andrew@xxxxxxxxxxxxxx> wrote:
I vaguely knew that you needed to create a wrapper script to automatically
set up multiple bridges on boot, so I did some Googling and came up with
this file:
dir=$(dirname "$0")
"$dir/network-bridge" "$@" vifnum=0 netdev=peth0 bridge=eth0
"$dir/network-bridge" "$@" vifnum=1 netdev=eth1 bridge=beth1
The default network bridge script has changed over versions of Xen, so
that syntax might not work. A snippet from
/etc/xen/scripts/network-bridge from xen 3.4.2:
# network-bridge (start|stop|status) {VAR=VAL}*
#
# Vars:
#
# bridge The bridge to use (default ${netdev}).
# netdev The interface to add to the bridge (default gateway device).
# antispoof Whether to use iptables to prevent spoofing (default no).
so when using 3.4.2 the syntax is probably
"$dir/network-bridge" "$@" netdev=eth0 bridge=eth0
"$dir/network-bridge" "$@" netdev=eth1 bridge=eth1
Adjust it as necessary, using the file of your current version of the file.
Note that I haven't tested it, because IMHO once you use some complex
configuration it's much easier and managable to simply use OS config
scripts.
[root@mars ~]# brctl show
bridge name bridge id STP enabled interfaces
The public IP assigned to dom0 works, but none of the IP's assigned to the
domU works.
because there's no bridge. You might be able to find out "why" by
looking at error messages on xend.log
So, how do I have a bridge named beth1 with the physical interface eth1
assigned to it, in addition to the default bridge eth0/peth0 created when I
boot the server?
You can try experimenting with the wrapper script, maybe others can
help you get it work.
Or you can simply comment out the entry from xend-config.sxp, and use
OS config scripts: /eyc/sysconfig/network-scripts/ifcfg-* on
RHEL/centos.
--
==============================================
Nuno Ricardo Santos Loureiro da Silva Ferreira
NMR Spectroscopy Research Group
Bijvoet Center for Biomolecular Research
Utrecht University
Bloembergen gebouw
Padualaan 8, 3584 CH Utrecht
The Netherlands
P: +31.(0)30.253 9932
F: +31.(0)30.253 2652
E: n.l.ferreira@xxxxx
W: http://nmr.chem.uu.nl
==============================================
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