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Networking Option 1: Provider networks

Install and configure the Networking components on the controller node.

Prerequisites

Before you configure networking option 1, you must configure kernel parameters to disable reverse-path filtering.

Edit the /etc/sysctl.conf file to contain the following parameters:
```
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0
```
Implement the changes:
```
# sysctl -p
```

Install the components

ubuntu

# apt-get install neutron-server neutron-plugin-ml2 \
  neutron-plugin-linuxbridge-agent neutron-dhcp-agent \
  neutron-metadata-agent python-neutronclient

rdo

# yum install openstack-neutron openstack-neutron-ml2 \
  openstack-neutron-linuxbridge python-neutronclient

obs

# zypper install --no-recommends openstack-neutron \
  openstack-neutron-server openstack-neutron-linuxbridge-agent \
  openstack-neutron-dhcp-agent openstack-neutron-metadata-agent \
  ipset

debian

Install and configure the networking components

# apt-get install neutron-server neutron-plugin-linuxbridge-agent \
  neutron-dhcp-agent neutron-metadata-agent

For networking option 2, also install the neutron-l3-agent package.

Respond to prompts for database management, Identity service credentials, service endpoint registration, and message queue credentials.
Select the ML2 plug-in:

Note

Selecting the ML2 plug-in also populates the service_plugins and allow_overlapping_ips options in the /etc/neutron/neutron.conf file with the appropriate values.

ubuntu or rdo or obs

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.
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] and [oslo_messaging_rabbit] sections, configure RabbitMQ message queue access:
```
[DEFAULT]
...
rpc_backend = rabbit

[oslo_messaging_rabbit]
...
rabbit_host = controller
rabbit_userid = openstack
rabbit_password = RABBIT_PASS
```
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]
...
auth_uri = http://controller:5000
auth_url = http://controller:35357
auth_plugin = password
project_domain_id = default
user_domain_id = 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_url = http://controller:8774/v2

[nova]
...
auth_url = http://controller:35357
auth_plugin = password
project_domain_id = default
user_domain_id = 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.

(Optional) To assist with troubleshooting, enable verbose logging in the [DEFAULT] section:
```
[DEFAULT]
...
verbose = True
```

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 project (private) networks:
```
[ml2]
...
tenant_network_types =
```
- In the [ml2] section, enable the Linux bridge mechanism:
```
[ml2]
...
mechanism_drivers = linuxbridge
```
  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 public flat provider network:
```
[ml2_type_flat]
...
flat_networks = public
```

Configure the Linux bridge agent

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

Edit the /etc/neutron/plugins/ml2/linuxbridge_agent.ini file and complete the following actions:
- In the [linux_bridge] section, map the public virtual network to the public physical network interface:
```
[linux_bridge]
physical_interface_mappings = public:PUBLIC_INTERFACE_NAME
```
  Replace PUBLIC_INTERFACE_NAME with the name of the underlying physical public network interface.
- In the [vxlan] section, disable VXLAN overlay networks:
```
[vxlan]
enable_vxlan = False
```
- In the [agent] section, enable ARP spoofing protection:
```
[agent]
...
prevent_arp_spoofing = True
```
- In the [securitygroup] section, enable security groups, enable ipset, and configure the Linux bridge iptables firewall driver:
```
[securitygroup]
...
enable_security_group = True
enable_ipset = True
firewall_driver = neutron.agent.linux.iptables_firewall.IptablesFirewallDriver
```

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 public networks can access metadata over the network:
```
[DEFAULT]
...
interface_driver = neutron.agent.linux.interface.BridgeInterfaceDriver
dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
enable_isolated_metadata = True
```
- (Optional) To assist with troubleshooting, enable verbose logging in the [DEFAULT] section:
```
[DEFAULT]
...
verbose = True
```

Return to Networking controller node configuration <neutron-controller-metadata-agent>.

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