HOWTO: Enabling Bridging for Libvirtd QEMU

-
I need to implement an SNMP setup for Inigo, and I need a number of virtual machines for understanding SNMP and for testing and exploring possible solutions. Before this, I used Xen through virt-manager for my virtualization needs, but recently it feels like its more pain in the ass when I need to install various distro and OSes on the VM to test. Plus, Xen caused some weird problems which I don't really understand (one of it are the Xen bridging, on random, refused to work after reboot). So, I switched to use the normal kernel with Qemu instead to avoid the headache.

Thanks to Jonathan (daMaestro), I got the Qemu bridge working. The howto I followed from watzmann.net does not work for me because of what I believe some missing details for me understand the setup and set it properly.

Creating a Bridge

Lets assume we want to create a bridge called br0, which will be bridged to eth0. The host will be using a static IP 192.168.0.20 on a /24 network, with a gateway 192.168.0.1.

Edit /etc/sysconfig/network-scripts/ifcfg-br0. Change it to be similar to this.


DEVICE=br0
BOOTPROTO=static
IPADDR=192.168.0.20
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
ONBOOT=yes
TYPE=Bridge


Then, edit /etc/sysconfig/network-scripts/ifcfg-eth0 to this.


DEVICE=eth0
HWADDR=$MACADDRESS
ONBOOT=yes
BRIDGE=br0


(Replace $MACADDRESS with the MAC address of your network card.)

Afterward, restart the network `/sbin/service network restart`

From this point, you should be able to select the bridge when you are creating a new VM through virt-manager.

Firewall

You will need to set br0 as a trusted interface through system-config-firewall before you'll be able to use the network.

Yay, now I feel much more comfortable on Qemu.

Comments

Anonymous said…
do you think it would be possible to convert these instructions to work with wlan0 instead of eth0?

Best regards,
John.
12:42 PM
<~!@#> said…
This comment has been removed by the author.
3:08 PM
Post a Comment

Popular posts from this blog

Tee'ing Python subprocess.Popen output

-
A little hack for python coders out there who wanted to have a functionality similar to the unix's tee command for redirecting output to multiple places.


import sys
from subprocess import Popen,PIPE
p = Popen(['put','command','and','arguments','here'],stdout=PIPE)

while True:
o = p.stdout.readline()
if o == '' and p.poll() != None: break
# the 'o' variable stores a line from the command's stdout
# do anything u wish with the 'o' variable here
# this loop will break once theres a blank output
# from stdout and the subprocess have ended
Read more

Announcing PlatoCDP, a Plone distribution for enterprises.

-
Image
Announcing the first release of PlatoCDP Plone distribution. A Plone distribution with the goal of attempting to build a more supportable, enterprise-ready, document management and content management  solution for government and enterprises. The ideal aim is to develop improvements on the distribution so that it will be a viable alternative to Sharepoint.
So what is it exactly?
An enterprise Plone distribution - that is, an integrated product which includes Plone, selected Plone add-ons, 3rd party softwares and integration/automation improvements to deliver an enterprise ready product for customers.Is it a rebrand of Plone? - It is an enterprise distribution product. PlatoCDP to Plone is like RHEL to Fedora. It is not a mere rebrand. PlatoCDP includes core Plone, additional components from the collective and its own improvements. We engage on packaging, certification and development activities to make the whole stack supportable for enterprises. These components of the dist…
Read more

Consolidated community site infrastructure on Plone

-
In Inigo, we believe in helping out local FOSS communities and help them grow. We help out in community events where we can, present FOSS talks, and provide some platforms for local communities to grow. One of such platform is our consolidated community site infrastructure on Plone.

The system/infra and its components was originally developed for the Fedora Malaysia website, while keeping in mind to keep it generic enough so that other communities could use the same components for their own community sites. The infra is already at a usable state, and we can add new sites easily with just a few clicks.

Features in this consolidated infra are:
Document/Content management (Plone built-in)Calendar system (powered by solgema.fullcalendar addon)Conference/BarCamp system (powered by collective.conference addon, which was developed for FUDCon Kuala Lumpur 2012)Blog (powered by Products.Scrawl)Simple yet powerful theming engine (powered by plone.app.theming/ Diazo) - Check out Diazo, you'l…
Read more