Bridged Networking with KVM in CentOS/RHEL 6.x

on June 12 | in Clusters, Linux | by | with No Comments

In this howto we will setup bridged networking to dedicate physical network device to KVM virtual machines/servers. Its best way to have local network between virtual machines  and provide better performance.

1. Create a Bridge

Before it was all manual to create bridge device but now KVM provide single command to do all. To create a bridge (br0) using eth0, you need to execute following command

This will create bridge (br0) device file in /etc/sysconfig/network-scripts/ and take all settings from eth0 to configure itself with configure eth0 to use br0.

2. Stop NetworkManager

You will also need to do following in all ifcfg-* file in /etc/sysconfig/network-scripts/ to disable NetworkManager. Edit all files and make sure to have following value

NM_CONTROLLED=no

After this stop NetworkManager and start network service to start bridge at startup.

You can now create or edit your virtual machine to use bridge network device (br0).

 

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