Well, after installed the KVM on CentOS , you may want to have a bridge networking on some of VMs
that you may have created.
Unfortunately, KVM doesn’t set this up automatically like the vmware who set its own device during vm-config.pl.
Luckily there are a lot of “How To” telling on step to make it happened.
One of the step that I tried is as follows :
1. First , need to install some package from rpmforge repo. (better sort out the yum repository for rpmforge first if you haven’t)
The package is:
yum install tunctl -y yum install bridge-utils -y
if necessary add the following into the /etc/rc.local
# into /etc/rc.local chown root:kvm /dev/net/tun cmod 0660 /dev/net/tun
then edit the network-configuration file to reflect the above ..
then amend the network script to something like the following :
# Broadcom Corporation NetXtreme BCM5755M Gigabit Ethernet PCI Express DEVICE=eth0 HWADDR=AA:BB:CC:DD:11:21 ONBOOT=yes BRIDGE=br0
then create the following new network config file into the same folder.
Assuming the static IP address previously assigned for this device to work. (eth0)
# Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet DEVICE=br0 TYPE=Bridge BOOTPROTO=static BROADCAST=192.168.211.255 #HWADDR=AA:BB:CC:DD:11:21 IPADDR=192.168.211.196 IPV6INIT=yes IPV6_AUTOCONF=yes NETMASK=255.255.255.0 NETWORK=192.168.211.0 GATEWAY=192.168.212.1 ONBOOT=yes DELAY=0 STP=off
Then, to use in KVM. Just edit the hardware-config for the VM.
1. Run “virtual-manager.” as the “privileged user ”
2. select which VM to change. and click “Open”. Probably better to notify user before shutting it down for re-configuration.
3. Get to the hardware tab.
Remove the old-network device there.
4. Then “Add Hardware”. Choose “Network”.
5. then the following will appear.. Choose “Physical network interface”.. eth0(bridge) should appear from the dropdown menu.
Then , maybe need to reboot the VM to get the new hardware detected.
And reconfigure the VMs network setting to suit your new “bridge” network IP setting.
1. CentOS KVM How To
2. VLAN Bridge
..and special thanks to .sha for the head up .
p/s : this will be very useful for setting up something that requiring bridge network instead of NAT.
Like the “ADAM.NET Utility” to send “UDP / MODBUS” read/write command via network…