17.13. Dynamically Changing a Host Physical Machine or a Network Bridge that is Attached to a Virtual NIC
This section demonstrates how to move the vNIC of a guest virtual machine from one bridge to another while the guest virtual machine is running without compromising the guest virtual machine
- Prepare guest virtual machine with a configuration similar to the following:
<interface type='bridge'> <mac address='52:54:00:4a:c9:5e'/> <source bridge='virbr0'/> <model type='virtio'/> </interface> - Prepare an XML file for interface update:
#
cat br1.xml<interface type='bridge'> <mac address='52:54:00:4a:c9:5e'/> <source bridge='virbr1'/> <model type='virtio'/> </interface> - Start the guest virtual machine, confirm the guest virtual machine's network functionality, and check that the guest virtual machine's vnetX is connected to the bridge you indicated.
# brctl showbridge name bridge id STP enabled interfaces virbr0 8000.5254007da9f2 yes virbr0-nic vnet0 virbr1 8000.525400682996 yes virbr1-nic - Update the guest virtual machine's network with the new interface parameters with the following command:
# virsh update-device test1 br1.xmlDevice updated successfully - On the guest virtual machine, run
service network restart. The guest virtual machine gets a new IP address for virbr1. Check the guest virtual machine's vnet0 is connected to the new bridge(virbr1)#
brctl showbridge name bridge id STP enabled interfaces virbr0 8000.5254007da9f2 yes virbr0-nic virbr1 8000.525400682996 yes virbr1-nic vnet0
