Networking Option 1: Provider networks

Install and configure the Networking components on the controller node.

Install the components

# yum install openstack-neutron openstack-neutron-ml2 \
  openstack-neutron-openvswitch

Configure the server component

The Networking server component configuration includes the database, authentication mechanism, message queue, topology change notifications, and plug-in.

Edit the /etc/neutron/neutron.conf file and complete the following actions:
- In the [database] section, configure database access:
```
[database]
# ...
connection = mysql+pymysql://neutron:NEUTRON_DBPASS@controller/neutron
```
  Replace NEUTRON_DBPASS with the password you chose for the database.
  
  Note
  
  Comment out or remove any other connection options in the [database] section.
- In the [DEFAULT] section, enable the Modular Layer 2 (ML2) plug-in and disable additional plug-ins:
```
[DEFAULT]
# ...
core_plugin = ml2
service_plugins =
```
- In the [DEFAULT] section, configure RabbitMQ message queue access:
```
[DEFAULT]
# ...
transport_url = rabbit://openstack:RABBIT_PASS@controller
```
  Replace RABBIT_PASS with the password you chose for the openstack account in RabbitMQ.
- In the [DEFAULT] and [keystone_authtoken] sections, configure Identity service access:
```
[DEFAULT]
# ...
auth_strategy = keystone

[keystone_authtoken]
# ...
www_authenticate_uri = http://controller:5000
auth_url = http://controller:5000
memcached_servers = controller:11211
auth_type = password
project_domain_name = Default
user_domain_name = Default
project_name = service
username = neutron
password = NEUTRON_PASS
```
  Replace NEUTRON_PASS with the password you chose for the neutron user in the Identity service.
  
  Note
  
  Comment out or remove any other options in the [keystone_authtoken] section.
- In the [DEFAULT] and [nova] sections, configure Networking to notify Compute of network topology changes:
```
[DEFAULT]
# ...
notify_nova_on_port_status_changes = true
notify_nova_on_port_data_changes = true

[nova]
# ...
auth_url = http://controller:5000
auth_type = password
project_domain_name = Default
user_domain_name = Default
region_name = RegionOne
project_name = service
username = nova
password = NOVA_PASS
```
  Replace NOVA_PASS with the password you chose for the nova user in the Identity service.

In the [oslo_concurrency] section, configure the lock path:

[oslo_concurrency]
# ...
lock_path = /var/lib/neutron/tmp

Configure the Modular Layer 2 (ML2) plug-in

The ML2 plug-in uses the Linux bridge mechanism to build layer-2 (bridging and switching) virtual networking infrastructure for instances.

Edit the /etc/neutron/plugins/ml2/ml2_conf.ini file and complete the following actions:
- In the [ml2] section, enable flat and VLAN networks:
```
[ml2]
# ...
type_drivers = flat,vlan
```
- In the [ml2] section, disable self-service networks:
```
[ml2]
# ...
tenant_network_types =
```
- In the [ml2] section, enable the Linux bridge mechanism:
```
[ml2]
# ...
mechanism_drivers = openvswitch
```
  Warning
  
  After you configure the ML2 plug-in, removing values in the type_drivers option can lead to database inconsistency.
- In the [ml2] section, enable the port security extension driver:
```
[ml2]
# ...
extension_drivers = port_security
```
- In the [ml2_type_flat] section, configure the provider virtual network as a flat network:
```
[ml2_type_flat]
# ...
flat_networks = provider
```

Configure the Open vSwitch agent

The Linux bridge agent builds layer-2 (bridging and switching) virtual networking infrastructure for instances and handles security groups.

Edit the /etc/neutron/plugins/ml2/openvswitch_agent.ini file and complete the following actions:
- In the [ovs] section, map the provider virtual network to the provider physical network interface:
```
[ovs]
bridge_mappings = provider:PROVIDER_INTERFACE_NAME
```
  Replace PROVIDER_INTERFACE_NAME with the name of the underlying provider physical network interface. See environment-networking-rdo for more information.
- In the [securitygroup] section, enable security groups and configure the Open vSwitch native or the hybrid iptables firewall driver:
```
[securitygroup]
# ...
enable_security_group = true
firewall_driver = openvswitch
#firewall_driver = iptables_hybrid
```
- In the case of using the hybrid iptables firewall driver, ensure your Linux operating system kernel supports network bridge filters by verifying all the following sysctl values are set to 1:
```
net.bridge.bridge-nf-call-iptables
net.bridge.bridge-nf-call-ip6tables
```
  To enable networking bridge support, typically the br_netfilter kernel module needs to be loaded. Check your operating system's documentation for additional details on enabling this module.

Configure the DHCP agent

The DHCP agent provides DHCP services for virtual networks.

Edit the /etc/neutron/dhcp_agent.ini file and complete the following actions:
- In the [DEFAULT] section, configure the Linux bridge interface driver, Dnsmasq DHCP driver, and enable isolated metadata so instances on provider networks can access metadata over the network:
```
[DEFAULT]
# ...
interface_driver = openvswitch
dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
enable_isolated_metadata = true
```

Create the provider network

Follow this provider network document from the General Installation Guide.

Return to Networking controller node configuration.

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