[CentOS] Bridge network for virt-manager

Tue Jun 2 14:33:12 UTC 2020
Alexander Dalloz <ad+lists at uni-x.org>

Am 02.06.2020 um 12:38 schrieb Jerry Geis:
> Hello. I desire to get bridge network working using virt-manager.
> Centos 7 and centos 7 guest.
> 
>  From researching I think I need to have a ifcfg-br0 file like this ?
> 
> cat ifcfg-br0
> DEVICE=nm-bridge0
> STP=no
> TYPE=Bridge
> BOOTPROTO=none
> IPADDR=192.168.1.8
> PREFIX=32
> GATEWAY=192.168.1.1
> IPV6INIT=no
> NAME=br0
> ONBOOT=yes
> DELAY=0
> 
> Is that for sure needed ? The use that nm-bridge0 as the network name?
> 
> I dont want to mess up my current setup.
> Thanks,
> 
> Jerry

Use the virt-manager to create the desired bridge. It will end under 
/etc/libvirt/qemu/networks/. And there probably exists already a

# cat /etc/libvirt/qemu/networks/default.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made 
using:
   virsh net-edit default
or other application using the libvirt API.
-->

<network>
   <name>default</name>
   <uuid>79d01cb2-28a4-4bdc-8b68-80ac588b2d61</uuid>
   <forward mode='nat'/>
   <bridge name='virbr0' stp='on' delay='0'/>
   <mac address='52:54:00:ec:84:b0'/>
   <ip address='192.168.122.1' netmask='255.255.255.0'>
     <dhcp>
       <range start='192.168.122.2' end='192.168.122.254'/>
     </dhcp>
   </ip>
</network>

Alexander