Networking Option 2: Self-service 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-l3-agent neutron-dhcp-agent \
  neutron-metadata-agent

Configure the server component

• 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 router service:

    [DEFAULT]
    # ...
    core_plugin = ml2
    service_plugins = router
    

  • 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, VLAN, and VXLAN networks:

    [ml2]
    # ...
    type_drivers = flat,vlan,vxlan
    

  • In the [ml2] section, enable VXLAN self-service networks:

    [ml2]
    # ...
    tenant_network_types = vxlan
    

  • In the [ml2] section, enable the Linux bridge and layer-2 population mechanisms:

    [ml2]
    # ...
    mechanism_drivers = openvswitch,l2population
    

    Warning

    After you configure the ML2 plug-in, removing values in the type_drivers option can lead to database inconsistency.

    Note

    The Linux bridge agent only supports VXLAN overlay networks.

  • 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
    

  • In the [ml2_type_vxlan] section, configure the VXLAN network identifier range for self-service networks:

    [ml2_type_vxlan]
    # ...
    vni_ranges = 1:1000
    

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 and configure the IP address of the physical network interface that handles overlay networks:

    [ovs]
    bridge_mappings = provider:PROVIDER_BRIDGE_NAME
    local_ip = OVERLAY_INTERFACE_IP_ADDRESS
    

    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.

    Also replace OVERLAY_INTERFACE_IP_ADDRESS with the IP address of the underlying physical network interface that handles overlay networks. The example architecture uses the management interface to tunnel traffic to the other nodes. Therefore, replace OVERLAY_INTERFACE_IP_ADDRESS with the management IP address of the controller node. See Host networking 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 [agent] section, enable VXLAN overlay networks and enable layer-2 population:

    [agent]
    tunnel_types = vxlan
    l2_population = true
    

  • 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 layer-3 agent

The Layer-3 (L3) agent provides routing and NAT services for self-service virtual networks.

• Edit the /etc/neutron/l3_agent.ini file in case additional customization is needed.

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 Dnsmasq DHCP driver, and enable isolated metadata so instances on provider networks can access metadata over the network:

    [DEFAULT]
    # ...
    dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
    enable_isolated_metadata = true
    

Return to Networking controller node configuration.