Procedure 7.10. Configuring the DHCP Agent

1. Configure the DHCP agent to use the Identity service for authentication.
   1. Set the authentication strategy to keystone:

      # openstack-config --set /etc/neutron/dhcp_agent.ini \
         DEFAULT auth_strategy keystone

   2. Set the Identity service host that the DHCP agent must use:

      # openstack-config --set /etc/neutron/dhcp_agent.ini \
         keystone_authtoken auth_host IP

      Replace IP with the IP address or host name of the server hosting the Identity service.
   3. Set the DHCP agent to authenticate as the correct tenant:

      # openstack-config --set /etc/neutron/dhcp_agent.ini \
         keystone_authtoken admin_tenant_name services

      Replace services with the name of the tenant created for the use of OpenStack Networking. Examples in this guide use services.
   4. Set the DHCP agent to authenticate using the neutron administrative user account:

      # openstack-config --set /etc/neutron/dhcp_agent.ini \
         keystone_authtoken admin_user neutron

   5. Set the DHCP agent to use the correct neutron administrative user account password:

      # openstack-config --set /etc/neutron/dhcp_agent.ini \
         keystone_authtoken admin_password PASSWORD

      Replace PASSWORD with the password set when the neutron user was created.
2. Set the interface driver in the /etc/neutron/dhcp_agent.ini file based on the OpenStack Networking plug-in being used. If you are using ML2, select either driver. Use the command that applies to the plug-in used in your environment:

   • Open vSwitch Interface Driver

     # openstack-config --set /etc/neutron/dhcp_agent.ini \
        DEFAULT interface_driver neutron.agent.linux.interface.OVSInterfaceDriver

   • Linux Bridge Interface Driver

     # openstack-config --set /etc/neutron/dhcp_agent.ini \
        DEFAULT interface_driver \
        neutron.agent.linux.interface.BridgeInterfaceDriver

3. Start the neutron-dhcp-agent service and configure it to start at boot time:

   # systemctl start neutron-dhcp-agent.service
   # systemctl enable neutron-dhcp-agent.service