[CentOS-virt] Finally switching from Xen to KVM - question about networking

Tue Jun 10 15:46:13 UTC 2014
Steve Campbell <campbell at cnpapers.com>

On 6/10/2014 10:46 AM, Digimer wrote:
> On 10/06/14 10:03 AM, Steve Campbell wrote:
>> I had so much trouble putting Centos 6 guest VMs on a Centos 5 host that
>> I finally switched to a Centos 6 host.
>> I've not needed more that test VMs, so I've used Virtual Machine Manager
>> on the old system, which worked pretty well, so I decided to create my
>> first KVM guest machine. I noticed when I created it, I only had the
>> options of NAT for my network interface, so I used that (obvious).
>> Well, after starting the VM, I find I don't have connectivity with that
>> interface. Reading, I find examples where I need to create bridges
>> perhaps. Xen did most of this for me, so it's a little new to me.
>> Can anyone throw me a clue, please?
>> steve campbell
> Setting up a bridge is not that hard, and it will give your VMs direct 
> access to the outside world, and host <-> VM access just fine as well.
> Here is a link showing how to setup a bridge connected to a bond 
> device. Ignore the bond and pretend it is a straight ethX device:
> https://alteeve.ca/w/AN!Cluster_Tutorial_2#Configuring_our_Bridge.2C_Bonds_and_Interfaces 
The host has a device named virbr0 that is installed during system 
installation. It also has a network device vnet0. There are no files in 
/etc/sysconfig/network-scripts for these.

Shouldn't I be able to use the virbr0 virtual bridge for this? I've 
tried setting up the VM's device with all of the options that is listed, 
but to no avail.

Should I need to set up another bridge for this?

And thanks for the link.