Re: [Xen-users] xen 3.4.2 networkings - multiple nics to multiple VMs

[Steven Timm <timm@xxxxxxxx>]

You need to modify the default network-bridge to start more
than one bridge.  You can start as many as you want.
Here's how I do two:

In xend-config.sxp

(network-script my-network-bridge)

In the my-network-bridge script

[root@fermigrid1 xen]# more scripts/my-network-bridge
#!/bin/sh
# start bridges on both eth0 and eth1

XENDIR="/etc/xen/scripts"

$XENDIR/network-bridge "$@" netdev=eth0 bridge=xenbr0 vifnum=0
$XENDIR/network-bridge "$@" netdev=eth1 bridge=xenbr1 vifnum=1


---------

I export both of those bridges to all of my vm's but wouldn't need to
do so.

In my xen1.cfg


vif = [ 'mac=00:16:3e:05:01:01, bridge=xenbr0', 'mac=00:16:3E:05:01:09, 
bridge=xenbr1' ]


Steve Timm


On Wed, 6 Oct 2010, fpt stl wrote:

> Greetings all,
>
> I do have some "basic" Xen networking questions, and please help me clarify
> some misunderstandings.
>
> I have a system with 2 built-in nics (Broadcom) and an add-on network card
> (Intel) with another 4 nics.
> Dom0 is CentOS 5.5 64bit with Xen 3.4.2 installed with the default settings
> (minus cpu pinning to Dom0 and memory setup for 2GB).
> I have 2 guest VMs - VM1 and VM2 - [HVMs] both being CentOS 64bit.
> Currently eth4 (Broadcom) is used for all 3 VMs because of the default
> bridge in xend-config.sxp:
>
> (network-script network-bridge)
>
> (vif-script vif-bridge)
>
> I would really appreciate if anyone of the smart people here can indicate
> how one can obtain a configuration with Dom0 using eth4 on one bridge, VM1
> using eth0 on another bridge and VM2 using eth1 on another bridge.
>
> Here is an example of a config file I used with "xm create":
>
> [root@Dom0 xen]# more VM1
> name = "VM1"
> maxmem = 4096
> memory = 4096
> vcpus = 2
> builder = "hvm"
> kernel = "/usr/lib/xen/boot/hvmloader"
> boot = "c"
> pae = 1
> acpi = 1
> apic = 1
> localtime = 0
> on_poweroff = "destroy"
> on_reboot = "restart"
> on_crash = "restart"
> device_model = "/usr/lib64/xen/bin/qemu-dm"
> sdl = 0
> vnc = 1
> vncunused = 1
> keymap = "en-us"
> disk = [ "phy:/dev/mapper/VG1-VM1_volume1,hda,w" , ",hdc:cdrom,r" ]
> vif = [ "mac=00:12:34:56:78:90,bridge=xenbr0,script=vif-bridge" ]
> parallel = "none"
> serial = "pty"
>
> The sole reason for multiple bridges and each one with its dedicated nic is
> to obtain separation between VMs.
> All the Ethernet connections will end in one switch.
>
>
> I have looked all over the net and I could not find a clear howto for this
> issue.
>
> Please give me some examples because I am very new to this issue.
>
>
> Frank
--
------------------------------------------------------------------
Steven C. Timm, Ph.D  (630) 840-8525
timm@xxxxxxxx  http://home.fnal.gov/~timm/
Fermilab Computing Division, Scientific Computing Facilities,
Grid Facilities Department, FermiGrid Services Group, Assistant Group Leader.

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