Networking Option 1: Provider networks

Install and configure the Networking components on the controller node.

Install the components

# apt install neutron-server neutron-plugin-ml2 \
  neutron-openvswitch-agent neutron-dhcp-agent \
  neutron-metadata-agent

Configure the server component

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

Note

Default configuration files vary by distribution. You might need to add these sections and options rather than modifying existing sections and options. Also, an ellipsis (...) in the configuration snippets indicates potential default configuration options that you should retain.

  • 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 bridge:

      [ovs]
      bridge_mappings = provider:PROVIDER_BRIDGE_NAME
      

      Replace PROVIDER_BRIDGE_NAME with the name of the bridge connected to the underlying provider physical network. See Host networking and Open vSwitch: Provider networks for more information.

    • Ensure PROVIDER_BRIDGE_NAME external bridge is created and PROVIDER_INTERFACE_NAME is added to that bridge

      # ovs-vsctl add-br $PROVIDER_BRIDGE_NAME
      # ovs-vsctl add-port $PROVIDER_BRIDGE_NAME $PROVIDER_INTERFACE_NAME
      
    • 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.