Networking Option 2: Self-service networks

Configure the Networking components on a compute node.

Configure the Open vSwitch agent

The Open vSwitch 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 compute 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.

Return to Networking compute node configuration.