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Quantum provides flexible software defined networking (SDN) for OpenStack.
This charm is designed to be used in conjunction with the rest of the OpenStack related charms in the charm store) to virtualized the network that Nova Compute instances plug into.
Its designed as a replacement for nova-network; however it does not yet support all of the features as nova-network (such as multihost) so may not be suitable for all.
Quantum supports a rich plugin/extension framework for propriety networking solutions and supports (in core) Nicira NVP, NEC, Cisco and others...
The Openstack charms currently only support the fully free OpenvSwitch plugin and implements the 'Provider Router with Private Networks' use case.
See the upstream Quantum documentation for more details.
In order to use Quantum with Openstack, you will need to deploy the nova-compute and nova-cloud-controller charms with the network-manager configuration set to 'Quantum':
nova-cloud-controller: network-manager: Quantum
This decision must be made prior to deploying Openstack with Juju as Quantum is deployed baked into these charms from install onwards:
juju deploy nova-compute juju deploy --config config.yaml nova-cloud-controller juju add-relation nova-compute nova-cloud-controller
The Quantum Gateway can then be added to the deploying:
juju deploy quantum-gateway juju add-relation quantum-gateway mysql juju add-relation quantum-gateway rabbitmq-server juju add-relation quantum-gateway nova-cloud-controller
The gateway provides two key services; L3 network routing and DHCP services.
These are both required in a fully functional Quantum Openstack deployment.