Install - OpenStack Installation Guide for Ubuntu 12.04 (LTS)

Controller node - Networking server

Install the Networking server.
See the section called “Install networking support on a dedicated controller node” for installation instructions.
Create database ovs_neutron.
See the section called “Install Networking services” for database creation details.

If not already configured, update the Networking /etc/neutron/neutron.conf configuration file to choose a plug-in and Identity Service user as necessary:

[DEFAULT]
core_plugin = neutron.plugins.openvswitch.ovs_neutron_plugin.OVSNeutronPluginV2
control_exchange = neutron
rabbit_host = controller
rabbit_password = RABBIT_PASS
notification_driver = neutron.openstack.common.notifier.rabbit_notifier

[database]
connection = mysql://neutron:NEUTRON_DBPASS@controller/neutron

[keystone_authtoken]
admin_tenant_name=service
admin_user=neutron
admin_password=NEUTRON_PASS

Update the plug-in /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini configuration file with the bridge mappings:
```
[ovs]
network_vlan_ranges = physnet1
bridge_mappings = physnet1:br-eth0
```
Restart the Networking service:
```
# service neutron-server restart
```

Compute node - Compute

Install the nova-compute service.
See the section called “Configure a Compute node” for installation instructions.

Update the Compute /etc/nova/nova.conf configuration file to make use of OpenStack Networking:

network_api_class=nova.network.neutronv2.api.API

neutron_admin_username=neutron
neutron_admin_password=NEUTRON_PASS
neutron_admin_auth_url=http://controller:35357/v2.0/
neutron_auth_strategy=keystone
neutron_admin_tenant_name=service
neutron_url=http://controller:9696/

Restart the Compute services
```
# service nova-compute restart
```

Compute and Network node - L2 agent

Install and start Open vSwitch. Then, configure neutron accordingly.
See the section called “Install and configure the Networking plug-ins” for detailed instructions.
Add the integration bridge to Open vSwitch:
```
# ovs-vsctl add-br br-int
```

Update the Networking /etc/neutron/neutron.conf configuration file:

[DEFAULT]
core_plugin = neutron.plugins.openvswitch.ovs_neutron_plugin.OVSNeutronPluginV2
control_exchange = neutron
rabbit_host = controller
rabbit_password = RABBIT_PASS
notification_driver = neutron.openstack.common.notifier.rabbit_notifier

[database]
connection = mysql://neutron:NEUTRON_DBPASS@controller/neutron

Update the plug-in /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini configuration file:
```
[ovs]
network_vlan_ranges = physnet1
bridge_mappings = physnet1:br-eth0
```
Create the br-eth0 network bridge to handle communication between nodes using eth0:
```
# ovs-vsctl add-br br-eth0
# ovs-vsctl add-port br-eth0 eth0
```
Restart the OpenStack Networking L2 agent:
```
# service neutron-openvswitch-agent restart
```

Network node - DHCP agent

Install the DHCP agent.
See the section called “Install Networking services on a dedicated network node” for generic installation instructions.

Update the Networking /etc/neutron/neutron.conf configuration file:

[DEFAULT]
core_plugin = neutron.plugins.openvswitch.ovs_neutron_plugin.OVSNeutronPluginV2
control_exchange = neutron
rabbit_host = controller
rabbit_password = RABBIT_PASS
notification_driver = neutron.openstack.common.notifier.rabbit_notifier

Ensure that the DHCP agent is using the correct plug-in my changing the configuration in /etc/neutron/dhcp_agent.ini:
```
interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
```
Restart the DHCP agent:
```
# service neutron-dhcp-agent restart
```