KVM Host Setup
Basic install
If your machine was built with a package set to support virtualisation this step may not be necessary.
apt-get install kvm libvirt-bin bridge-utils vlan python-vm-builder
Networking
If need interface level vlan support do
sudo modprobe 8021q
We use bridging for the network interfaces. There can be several interfaces: e.g. a "main" interface, one for a storage network and/or dedicated connection, one for guests on an SSN. Adapt IP addressing and interface definitions as necessary. Different setups will have very different requirements.
- Edit /etc/network/interfaces as needed, bridging interfaces to suit:
# Main interface auto br0 iface br0 inet static address 10.0.0.162 netmask 255.255.0.0 gateway 10.0.0.153 bridge_ports eth0 [CHECK what your particular interface is called - it may be eth0, but may be em1 for instance] bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off # SAN auto br1 iface br1 inet static address 192.168.20.49 netmask 255.255.255.224 bridge_ports eth1 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off # SSN auto eth0.98 iface eth0.98 inet manual auto extbr98 iface extbr98 inet manual bridge_ports eth0.98 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off
The interfaces should have the same name on all hosts, so that we can move VMs from one host to the other without having to change the configuration every time.
Modifying default virtual bridge
By default libvirt creates a virtual bridge named virbr0 (can be checked with ifconfig command). If you want to modify this interface for another subnet you can do this by first shutting down the interface:
virsh net-destroy default
Modify the interface
virsh net-edit default
And start it again
virsh net-start default
