RE: [Xen-users] Dedicate Nic's to DomU's

[augusto lopes <nhanonme@xxxxxxxxxxxx>]

hi there, 

I am not sure whether this issue is solved or not, but I kind of found some relevant information when trying something similar and facing troubles.
Having read the tutorial and the blog, I came to understand alot about creating and configuring bridges on xen virtual environment. Just follow this link: http://www.debian-administration.org/articles/470

good luck

Augusto Lopes

Hans Pfeil <HPfeil@xxxxxxx> escreveu:

Joe, thanks so much. I hate to be a bother. I really appreciate your time and efforts. I started @ 1 because I thought what would Dom0 use? I thought if I configured 0 it would mess up the host, don't know. We are running Xen 3.0 on Novell's SLES10.1 Here are the outputs:

:~ # brctl show
bridge name bridge id STP enabled interfaces
:~ #

:~ # sh /etc/xen/scripts/multi-network-bridge
/etc/xen/scripts/multi-network-bridge: line 3: /etc/xen/scripts: is a directory
/etc/xen/scripts/multi-network-bridge: line 5: /network-bridge: No such file or directory
:~ #

-Hans


>>> "Joseph L. Casale" 6/9/2008 12:51 PM >>>
multi-network-bridge
I am not sure it matters, but your vifnuym starts @ 1?

Config looks right...

type:
#brctl show
:)

ifconfig shows an issue :)
Your missing the vifs, the renamed physical device that the bridge in question uses.
Whats is the output from this:

#sh /etc/xen/scripts/multi-network-bridge

Your bridges done appear to have been made! What version of xen on what distro?
jlc

________________________________________
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Hans Pfeil [HPfeil@xxxxxxx]
Sent: Monday, June 09, 2008 11:42 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Dedicate Nic's to DomU's

Joe, yep I did make the file executable. (didn't know I had to until this morning. A guy here at work showed me. But it still didn't work) I deduce that it's not working because when I open the virt manager and click "run" to start the virt server it automatically goes to pause. It just sits there in pause mode. When I change everything back, all is well.
Here is copy of the outputs you asked for. Also, here are some of the other files that I have. I've attached the xend-config.spx file.

# cat /etc/xen/scripts/multi-network-bridge
#!/bin/sh
dir=$(/etc/xen/scripts "$0")
"$dir/network-bridge" "$@" vifnum=1 bridge=xenbr1 netdev=eth1

Here is the config file for the virtual guest server:

ostype="oes2l"
name="XXXXXX"
memory=1024
vcpus=1
uuid="a1ee16a1-cd9b-2493-60cb-77aea298d8fa"



localtime=0
builder="linux"
bootloader="/usr/lib/xen/boot/domUloader.py"
bootargs="--entry=xvda2:/boot/vmlinuz-xenpae,/boot/initrd-xenpae"
extra="TERM=xterm "
disk=[ 'file:/var/lib/xen/images/Harrier/disk0,xvda,w', ]
vif=[ 'bridge=eth1, mac=00:16:3e:6f:e6:6a', ]
vfb=["type=vnc,vncunused=1"]


Usage: brctl [commands]
commands:
addbr add bridge
delbr delete bridge
addif add interface to bridge
delif delete interface from bridge
setageing set ageing time
setbridgeprio set bridge priority
setfd set bridge forward delay
sethello set hello time
setmaxage set max message age
setpathcost set path cost
setportprio set port priority
show show a list of bridges
showmacs show a list of mac addrs
showstp show bridge stp info
stp {on|off} turn stp on/off


# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0F:1F:04:0B:49
inet addr:xxx.xxx.xxx.xx Bcast:xxx.xxx.xxx.xx Mask:255.255.255.0
inet6 addr: fe80::20f:1fff:fe04:b49/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:597 errors:0 dropped:0 overruns:0 frame:0
TX packets:214 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:54601 (53.3 Kb) TX bytes:19415 (18.9 Kb)
Interrupt:17

eth1 Link encap:Ethernet HWaddr 00:0F:1F:04:0B:4A
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:18

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:465 errors:0 dropped:0 overruns:0 frame:0
TX packets:465 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:29962 (29.2 Kb) TX bytes:29962 (29.2 Kb)



>>> "Joseph L. Casale" 6/9/2008 10:43 AM >>>
Well, I have not actually tested a config with it not configured, so I don't know for certain:)
I am not a Linux Bridge Utils guru, but I rembered from a vmware server kb article that you
could confiugure a NIC with an IP of 0.0.0.0 to prevent traffic getting the host, then unless
there is some specific requirement to Bridging, as long as the guests where in the same subnet
they would see each other, someone feel free to CMIIW.

I also neglected to mention I thiink you need to make the new script (mine is multi-network-bridge)
executable, just check your existing network-bridge script. Your logs will tell all.

What does # brctl show output? What does #ifconfig output?

How do you deduce its not working, I presume you are trying to communicate between two guests
that are in this bridge?

jlc

________________________________________
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Hans Pfeil [HPfeil@xxxxxxx]
Sent: Monday, June 09, 2008 8:49 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Dedicate Nic's to DomU's

Hey Joe, thanks for all your help and effort on this. Unfortunately I couldn't get it to work. Allow me to ask a question. Does the actual physical nic, I'll call eth1, need to be configured with an IP address, routing, and host name first? Right now I have eth1 with nothing configured.

Thanks
-Hans



>Don't happen to have an example of all this stuff do you? This way I could just copy it over to my side. >Thanks.
>
>-Hans

I can provide you with the files I use, but without a minimal understanding of it, you'll be
hard pressed to make it work for your environment anyway.

I must suggest a good book I am just wrapping it up. One of the list members, Todd Deshane
has co-authored *the* most excellent book on Xen, Running Xen. It not only details everything
you need to know to run xen, it walks you through everything step by step to do things correctly
and it does this most thoroughly! You will be very comfortable running xen after this book!

I am running 3.2.0 on this host, so the bridge names are identical to the original eth names.
That most certainly could be different from your version, check your docs.

You need to edit /etc/xen/xend-config.sxp
-Locate the line: (network-script network-bridge)
-Make it say something like: (network-script multi-network-bridge)
-Now create a script in /etc/xen/scripts called multi-network-bridge

# cat /etc/xen/scripts/multi-network-bridge
#!/bin/sh
dir=$(dirname "$0")
"$dir/network-bridge" "$@" vifnum=0 netdev=eth0 bridge=eth0
"$dir/network-bridge" "$@" vifnum=1 netdev=eth1 bridge=eth1
.
.
.
"$dir/network-bridge" "$@" vifnum=n netdev=ethn bridge=ethn

Now you edit the config for your guests, usually located in /etc/xen but you can
the docs for your distro or follow one of many tutorials available.
-You will see, or need to add a line:
vif = [ 'bridge=eth0, mac=00:16:3E:77:A5:D6', ]
-This will create one nic in the guest, and add it to the bridge named eth0 which
contains the original eth0 physical nic in the xen server.

Good luck,
jlc


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