ironic/install-guide/source/include/configure-neutron-networks.rst

Configure Networking to communicate with the bare metal server

You need to configure Networking so that the bare metal server can communicate with the Networking service for DHCP, PXE boot and other requirements. This section covers configuring Networking for a single flat network for bare metal provisioning.

You will also need to provide Bare Metal service with the MAC address(es) of each node that it is provisioning; Bare Metal service in turn will pass this information to Networking service for DHCP and PXE boot configuration. An example of this is shown in the enrollment section.

1. Edit /etc/neutron/plugins/ml2/ml2_conf.ini and modify these:

   [ml2]
   type_drivers = flat
   tenant_network_types = flat
   mechanism_drivers = openvswitch
   
   [ml2_type_flat]
   flat_networks = physnet1
   
   [securitygroup]
   firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
   enable_security_group = True
   
   [ovs]
   bridge_mappings = physnet1:br-eth2
   # Replace eth2 with the interface on the neutron node which you
   # are using to connect to the bare metal server

2. If neutron-openvswitch-agent runs with ovs_neutron_plugin.ini as the input config-file, edit ovs_neutron_plugin.ini to configure the bridge mappings by adding the [ovs] section described in the previous step, and restart the neutron-openvswitch-agent.

3. Add the integration bridge to Open vSwitch:

   $ ovs-vsctl add-br br-int

4. Create the br-eth2 network bridge to handle communication between the OpenStack services (and the Bare Metal services) and the bare metal nodes using eth2. Replace eth2 with the interface on the network node which you are using to connect to the Bare Metal service:

   $ ovs-vsctl add-br br-eth2
   $ ovs-vsctl add-port br-eth2 eth2

5. Restart the Open vSwitch agent:

   # service neutron-plugin-openvswitch-agent restart

6. On restarting the Networking service Open vSwitch agent, the veth pair between the bridges br-int and br-eth2 is automatically created.

   Your Open vSwitch bridges should look something like this after following the above steps:

   $ ovs-vsctl show
   
       Bridge br-int
           fail_mode: secure
           Port "int-br-eth2"
               Interface "int-br-eth2"
                   type: patch
                   options: {peer="phy-br-eth2"}
           Port br-int
               Interface br-int
                   type: internal
       Bridge "br-eth2"
           Port "phy-br-eth2"
               Interface "phy-br-eth2"
                   type: patch
                   options: {peer="int-br-eth2"}
           Port "eth2"
               Interface "eth2"
           Port "br-eth2"
               Interface "br-eth2"
                   type: internal
       ovs_version: "2.3.0"

7. Create the flat network on which you are going to launch the instances:

   $ neutron net-create --tenant-id $TENANT_ID sharednet1 --shared \
         --provider:network_type flat --provider:physical_network physnet1

8. Create the subnet on the newly created network:

   $ neutron subnet-create sharednet1 $NETWORK_CIDR --name $SUBNET_NAME \
         --ip-version=4 --gateway=$GATEWAY_IP --allocation-pool \
         start=$START_IP,end=$END_IP --enable-dhcp