Install - OpenStack Installation Guide for Ubuntu 12.04 (LTS)

Controller nodeNetworking server

Install the Networking server.
Create database ovs_neutron.

Update the Networking configuration file, /etc/neutron/neutron.conf, with plug-in choice 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:3306/neutron

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

Update the plug-in configuration file, /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini:
```
[ovs]
tenant_network_type = gre
tunnel_id_ranges = 1:1000
enable_tunneling = True
```
Start the Networking server.
The Networking server can be a service of the operating system. The command to start the service depends on your operating system. The following command runs the Networking server directly:
```
# neutron-server --config-file /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini \
  --config-file /etc/neutron/neutron.conf
```

Compute nodeCompute

Install Compute services.

Update the Compute /etc/nova/nova.conf configuration file. Make sure the following line appears at the end of this file:

network_api_class=nova.network.neutronv2.api.API

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

Restart relevant Compute services.

Compute and Networking nodeL2 agent

Install and start Open vSwitch.
Install the L2 agent (Neutron Open vSwitch agent).
Add the integration bridge to the Open vSwitch:
```
# ovs-vsctl add-br br-int
```

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

[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:3306/neutron

Update the plug-in configuration file, /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini.

Compute node:

[ovs]
tenant_network_type = gre
tunnel_id_ranges = 1:1000
enable_tunneling = True
local_ip = 9.181.89.202

Network node:

[ovs]
tenant_network_type = gre
tunnel_id_ranges = 1:1000
enable_tunneling = True
local_ip = 9.181.89.203

Create the integration bridge br-int:
```
# ovs-vsctl --may-exist add-br br-int
```
Start the Networking L2 agent
The Networking Open vSwitch L2 agent can be a service of operating system. The command to start depends on your operating systems. The following command runs the service directly:
```
# neutron-openvswitch-agent --config-file /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini \
  --config-file /etc/neutron/neutron.conf
```

Network nodeDHCP agent

Install the DHCP agent.

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

[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
allow_overlapping_ips = True

Set allow_overlapping_ips because TenantA and TenantC use overlapping subnets.

Update the DHCP /etc/neutron/dhcp_agent.ini configuration file:

interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver

Start the DHCP agent.
The Networking DHCP agent can be a service of operating system. The command to start the service depends on your operating system. The following command runs the service directly:
```
# neutron-dhcp-agent --config-file /etc/neutron/neutron.conf \
  --config-file /etc/neutron/dhcp_agent.ini
```

Network nodeL3 agent

Install the L3 agent.
Add the external network bridge
```
# ovs-vsctl add-br br-ex
```
Add the physical interface, for example eth0, that is connected to the outside network to this bridge:
```
# ovs-vsctl add-port br-ex eth0
```
Update the L3 configuration file /etc/neutron/l3_agent.ini:
```
[DEFAULT]
interface_driver=neutron.agent.linux.interface.OVSInterfaceDriver
use_namespaces=True
```
Set the use_namespaces option (it is True by default) because TenantA and TenantC have overlapping subnets, and the routers are hosted on one l3 agent network node.
Start the L3 agent
The Networking L3 agent can be a service of operating system. The command to start the service depends on your operating system. The following command starts the agent directly:
```
# neutron-l3-agent --config-file /etc/neutron/neutron.conf \
--config-file /etc/neutron/l3_agent.ini
```