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BTW, adding a 2nd virtual nic to a guest can also be done with
command line tools (I just googled this for you) :<br>
<a class="moz-txt-link-freetext" href="https://kashyapc.fedorapeople.org/virt/add-network-card-in-guest.txt">https://kashyapc.fedorapeople.org/virt/add-network-card-in-guest.txt</a><br>
( It came up as 1st result when I searched for: virsh add network
interface to existing guest )<br>
<br>
But if you look at the bottom of this guide, they also mention that
if something goes wrong, they resort to using virsh edit just like I
suggested to you. See, I prefer to edit a configuration file rather
then issuing long and complicated commands on the CLI. However,
being able to add a 2nd nic to a live guest is nice though and that
could only be achieved with the CLI command. As you can see, you can
even add nic's to a VM without having to reboot it.<br>
<br>
Zoltan<br>
<br>
<div class="moz-cite-prefix">On 12/9/2015 10:58 AM, Howard Leadmon
wrote:<br>
</div>
<blockquote cite="mid:011101d13268$31b55510$951fff30$@leadmon.net"
type="cite">
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<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailEndCompose"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
How do you decide what MAC address to use for that VM
interface? As I just tried to change the MAC to some
other value close, like I made '52:54:00:34:e1:21' into
say '52:54:00:34:e1:32', and when I try and load it in, I
get the following:<o:p></o:p></span></a></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">error:
XML error: Attempted double use of PCI Address '0:0:4.0'<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Here
is one of my network entries:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
<interface type='bridge'><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
<mac address='52:54:00:34:e1:21'/><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
<source bridge='br1'/><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
<model type='virtio'/><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
</interface><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:#1F497D">---<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:#1F497D">Howard
</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in
0in 0in 4.0pt">
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">
<a class="moz-txt-link-abbreviated" href="mailto:centos-virt-bounces@centos.org">centos-virt-bounces@centos.org</a>
[<a class="moz-txt-link-freetext" href="mailto:centos-virt-bounces@centos.org">mailto:centos-virt-bounces@centos.org</a>] <b>On Behalf
Of </b>Zoltan Frombach<br>
<b>Sent:</b> Wednesday, December 9, 2015 4:24 AM<br>
<b>To:</b> Discussion about the virtualization on
CentOS <a class="moz-txt-link-rfc2396E" href="mailto:centos-virt@centos.org"><centos-virt@centos.org></a><br>
<b>Subject:</b> Re: [CentOS-virt] How to manually add
a new interface to a bridge device?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
You most definitely do not need to destroy and re-create a
VM just to add a 2nd network interface.<br>
<br>
I don't think those vnet interfaces got created by the host
OS. I believe those are created by KVM (or libvirt) when you
start a VM. I could be wrong though. But I just checked on
my CentOS 6 KVM host machine and I see as many vnet
interfaces as many VMs are currently running (or if one VM
has two virtual network cards then of course that VM results
two vnet interfaces shown on the host). Here the relevant
part from one such VM's XML file (those XML files are under
the /etc/libvirt/qemu directory on my CentOS host ) :<br>
<br>
<interface type='bridge'><br>
<mac address='00:16:36:e2:20:ea'/><br>
<source bridge='br0'/><br>
<model type='virtio'/><br>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/><br>
</interface><br>
<interface type='bridge'><br>
<mac address='00:16:36:e2:20:eb'/><br>
<source bridge='br600'/><br>
<model type='virtio'/><br>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x06' function='0x0'/><br>
</interface><br>
<br>
As you can see, there are two interfaces defined in this
VM's XML file. One is connected to the host's br0 interface
and the 2nd is connected to the host's br600 interface. You
must make sure that all your mac addesses are unique on your
network though!!<br>
<br>
After editing a VM's XML file with your favorite editor, you
need to execute this command:<br>
virsh define /etc/libvirt/qemu/<i>your-vm-name</i>.xml<br>
or just simply use this editor:<br>
virsh edit <i>your-vm-name</i><br>
(but I hate vi, so I use my favorite editor and when I
finished editing I just run virsh define.)<br>
<br>
I edited VM's XML files many times and I can add/remove
virtual network cards without problems.<br>
<br>
Zoltan<o:p></o:p></p>
<div>
<p class="MsoNormal">On 12/9/2015 9:55 AM, Howard Leadmon
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Tried
that as well, but this has to be something that gets set
at the OS level and loaded, as if you look at dmesg
output, you can see all the vnet?? nodes as the OS comes
online. So the question is, what is virt-install
doing that creates the needed vnet interface that is
part of the bridge. I really had to kill and reload
the VM just to load a second interface..</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:#1F497D">---</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:#1F497D">Howard
Leadmon </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div style="border:none;border-left:solid blue
1.5pt;padding:0in 0in 0in 4.0pt">
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <a
moz-do-not-send="true"
href="mailto:centos-virt-bounces@centos.org"><a class="moz-txt-link-abbreviated" href="mailto:centos-virt-bounces@centos.org">centos-virt-bounces@centos.org</a></a>
[<a moz-do-not-send="true"
href="mailto:centos-virt-bounces@centos.org">mailto:centos-virt-bounces@centos.org</a>]
<b>On Behalf Of </b>Zoltan Frombach<br>
<b>Sent:</b> Wednesday, December 9, 2015 2:42 AM<br>
<b>To:</b> Discussion about the virtualization on
CentOS <a moz-do-not-send="true"
href="mailto:centos-virt@centos.org"><centos-virt@centos.org></a><br>
<b>Subject:</b> Re: [CentOS-virt] How to manually
add a new interface to a bridge device?</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p>I would stop the VM, edit its definition file (that's
an XML file) and then start it up. But be careful: After
you edit the XML file, you need to execute a command so
KVM re-reads that file. I forgot that command, but you
can look it up on Google.<o:p></o:p></p>
<div>
<p class="MsoNormal">On Dec 9, 2015 7:52 AM, "Howard
Leadmon" <<a moz-do-not-send="true"
href="mailto:howard@leadmon.net">howard@leadmon.net</a>>
wrote:<o:p></o:p></p>
<blockquote style="border:none;border-left:solid #CCCCCC
1.0pt;padding:0in 0in 0in
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Maybe
my google-fu is failing me, but I have spent the
past couple hours looking at how to add a vnet?
Device to my KVM host running CentOS 6, and for
the life of me I can’t get this going. <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">From
all my research if I want to add a device I
should just do ‘brctl addif br1 vnet14’ if I
want to add a vnet14 to bridge br1. When I do
this, I get:<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#
brctl addif br0 vnet14<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">interface
vnet14 does not exist!<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If
I run a ‘brctl show’ I get the following:<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">#
brctl show<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">bridge
name bridge id STP enabled
interfaces<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">br0
8000.00237dd22a4c no eth0<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet0<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet10<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet11<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet13<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet2<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> vnet3<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet4<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet6<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet8<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">br1
8000.00237dd22a50 no
eth1<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet1<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet12<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet5<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet7<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">
vnet9<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Needless
to say the existing vnet?? Devices are in use on
guest VM’s currently.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">When
I create a new VM using virt-install, I usually
add the following to my command line:<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">--network=bridge:br0
--network=bridge:br1<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I
messed up building a new VM, and only added the
br0 interface to the VM, but need the br1
interface as well. So my question is, or a
pointer to how I can add that br1 interface to
my existing VM, and create the needed vnet14
interface for it to attach to?<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If
anyone can explain how to do this, or give me a
good pointer on where the info is on how to do
this, it would sure be a huge help..<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks…<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:10.5pt;color:#1F497D">---</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-size:10.5pt;color:#1F497D">Howard
Leadmon </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
_______________________________________________<br>
CentOS-virt mailing list<br>
<a moz-do-not-send="true"
href="mailto:CentOS-virt@centos.org">CentOS-virt@centos.org</a><br>
<a moz-do-not-send="true"
href="https://lists.centos.org/mailman/listinfo/centos-virt"
target="_blank">https://lists.centos.org/mailman/listinfo/centos-virt</a><o:p></o:p></p>
</blockquote>
</div>
</div>
<p class="MsoNormal"><br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>CentOS-virt mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:CentOS-virt@centos.org">CentOS-virt@centos.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="https://lists.centos.org/mailman/listinfo/centos-virt">https://lists.centos.org/mailman/listinfo/centos-virt</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
CentOS-virt mailing list
<a class="moz-txt-link-abbreviated" href="mailto:CentOS-virt@centos.org">CentOS-virt@centos.org</a>
<a class="moz-txt-link-freetext" href="https://lists.centos.org/mailman/listinfo/centos-virt">https://lists.centos.org/mailman/listinfo/centos-virt</a>
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