KVM: setting up bridged mode

• RedHat tell you to replace NetworkManager with network first: access.redhat.com/…ibvirt.html

systemctl disable NetworkManager
systemctl enable network
systemctl stop NetworkManager
systemctl start network

• The only problem with the above is that network does not seem to start on boot.

chkconfig --list network    # shows that it should be running
systemctl start network     # the

I am testing using iozone.

Here is a recommendation from serverfault.com/…o-performance

The optimal configuration is (usually) as follows:

1. On the host, set elevator=deadline
2. Use virtio and only virtio
3. use raw LVs whenever possible. Qcow2 gives overhead. Files on a FS also have overhead
4. in the VM use the elevator=noop (See blog.bodhizazen.net/…rformance)
5. both in host and VM, use noatime,nodiratime in fstab wherever possible

Red Hat's own documentation can be found here:
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtua...

Set up bridging on server:

• http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtua...
• Follow suggestion: Instead of turning off NetworkManager, add "NM_CONTROLLED=no" to the ifcfg-* scripts used in the examples.

Note that this now only works for the 64 bit version of CentOS

useful link: http://itscblog.tamu.edu/startup-guide-for-kvm-on-centos-6/

yum groupinstall "Virtualization*"
yum install dejavu-lgc-sans-fonts
echo "BRIDGE=br0" >> /etc/sysconfig/network-scripts/ifcfg-eth0
#now check it looks ok:
vi /etc/sysconfig/network-scripts/ifcfg-eth0