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Deploy the Quantum virtual network service and configure Nova to use QuantumManager as its NetworkManager. Quantum includes several plugins. The openvswitch plugin is covered here.


The installtion of the Quantum packages is done the openstack-demo-install utility. This will also configure a Quantum user with Keystone. The examples below show the usage of OpenvSwitch as the plugin and agent. This can be replaced by any one of the other supported agents, for example linux bridge.

Note: If you have sourced keystone.rc then please make sure that you set the following environment variables. These are used by the Quantun setup scripts and match the configured keystone user and password.


Install the openvswitch package. This will also install the openvswitch package.

$> sudo yum install -y openstack-quantum-openvswitch

Enable and start the openvswitch service

$> sudo systemctl enable openvswitch.service
$> sudo systemctl start openvswitch.service

Create the integration bridges (these are used for VM traffic management and layer 3 external networking)

$> sudo ovs-vsctl add-br br-int
$> sudo ovs-vsctl add-br br-ex

Configure quantum-server to use the openvswitch Please note that this will create a database:

$> sudo quantum-server-setup --plugin openvswitch

Please check that the following appear in /etc/nova/nova.conf under the DEFAULT section:

network_api_class =
quantum_admin_username = quantum
quantum_admin_password = servicepass
quantum_admin_auth_url =
quantum_auth_strategy = keystone
quantum_admin_tenant_name = service
quantum_url = http://localhost:9696/

NOTE The above script sets the libvirt_vif_driver in /etc/nova/nova.conf. Please replace this with libvirt_vif_driver = nova.virt.libvirt.vif.LibvirtOpenVswitchDriver. The driver uses qemu's "ethernet" network this requires doing the following:

$> sudo systemctl stop libvirtd.service
$> cat >> /etc/libvirt/qemu.conf <<EOF
cgroup_device_acl = [
   "/dev/null", "/dev/full", "/dev/zero",
   "/dev/random", "/dev/urandom",
   "/dev/ptmx", "/dev/kvm", "/dev/kqemu",
   "/dev/rtc", "/dev/hpet", "/dev/net/tun",
$> sudo systemctl start libvirtd.service

Enable and start the quantum-server:

$> sudo systemctl enable quantum-server.service
$> sudo systemctl start quantum-server.service

Restart the nova compute (quantum updates drivers in the nova.conf configuration file)

Enable and start the layer 2 agent:

$> sudo systemctl enable quantum-openvswitch-agent.service
$> sudo systemctl start quantum-openvswitch-agent.service

Configure the DHCP service (set the hostname as localhost):

$> sudo quantum-dhcp-setup --plugin openvswitch

Enable and start the DHCP agent:

$> sudo systemctl enable quantum-dhcp-agent.service
$> sudo systemctl start quantum-dhcp-agent.service

Configure the L3 service:

$> sudo quantum-l3-setup --plugin openvswitch

Please check that the following are in /etc/quantum/l3_agent.ini:

auth_url = http://localhost:35357/v2.0/
auth_region = RegionOne
admin_tenant_name = service
admin_user = quantum
admin_password = servicepass

Enable and start the L3 agent:

$> sudo systemctl enable quantum-l3-agent.service
$> sudo systemctl start quantum-l3-agent.service

quantum now should be up and ready to go. Check the log files to see if there are any error:

  1. Service - /var/log/quantum/server.log
  2. OpenvSwitch agent - /var/log/quantum/openvswitch-agent.log
  3. DHCP agent - /var/log/quantum/dhcp-agent.log
  4. L3 agent - /var/log/quantum/l3-agent.log

How to test


Ensure that environment varibales are configured to run the client

$> source keystonerc

Get the keystone tenant-id for the service tenant

$>  keystone tenant-list

This ID will be used for the service tenant.

Create network and subnet

$> quantum net-create --tenant-id <TENANT_ID> net1
$> quantum subnet-create --tenant-id <TENANT_ID> net1

Create a router, and add the private subnet as one of its interface

$> quantum router-create --tenant_id <TENANT_ID> router1
$> quantum router-interface-add <ROUTER_ID> <SUBNET_ID>

Create an external network, and a subnet. Note that this is on a different tenant and the DHCP is disabled for the subnet.

$> quantum net-create ext_net -- --router:external=True
$> quantum subnet-create ext_net -- --enable_dhcp=False
$> quantum router-gateway-set <ROUTER_ID> <EXTERNAL_NETWORK_ID>

Get the external gateway IP

$> quantum subnet-show <EXTERNAL_SUBNET_ID>

Update the gateway IP for the external bridge (using the gateway subnet)

$> sudo ip addr add dev br-ex
$> sudo ip link set br-ex up

Connectivity between VM's. Boot a VM

$> nova image-list
$> nova boot --image <name> --flavor 1 <name>

Assign a floating IP to a VM

$> quantum floatingip-create ext_net
$> quantum floatingip-associate <floating ip id> <portid>

Expected Results

  1. After the subnet create the DHCP server should allocate a port to allocate IP addresses to the VMs running on the network. Run quantum port-list to check that a port has been created.
  2. Check that a namespace has been created for the DHCP agent. Run ip netns. A namespace should be created with the prefix dhcp. This can be used to ping VM's deployed on the network.
  3. The L2 agent will add the port to the integration bridge. Run sudo ovs-vsctl show. This will show that a tap device for the DHCP agent has been added to the integration bridge. The tap device name will be the first 11 bytes of the port ID.
  4. After the router createion a tap device for the router will be attached to the integration bridge. This will have the prefix 'qr-'.
  5. The DHCP IP address will be and the Router address will be
  6. Check that a namespace has been created for the router agent. Run ip netns. A namespace should be created with the prefix qrouter. This can be used to ping VM's deployed on the network.
  7. When the router gateway is set a tap device is create on the external bridge. This has the prefix 'qg'.
  8. VM's that are started should receive and IP address on the network In addition to this if there is more than one VM on the network the VM's should be able to ping one another.
  9. VMs with floating IP's are accessible via those IP addresses.