Procedure 7.14. Configuring the DHCP Agent

1. Configuring Authentication

   The DHCP agent must be explicitly configured to use the Identity service for authentication.
   1. Set the authentication strategy (auth_strategy) configuration key to keystone using the openstack-config command.

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

   2. Set the authentication host (auth_host configuration key) to the IP address or host name of the Identity server.

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

      Replace IP with the IP address or host name of the Identity server.
   3. Set the administration tenant name (admin_tenant_name) configuration key to the name of the tenant that was created for the use of the networking services. Examples in this guide use services.

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

   4. Set the administration user name (admin_user) configuration key to the name of the user that was created for the use of the networking services. Examples in this guide use neutron.

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

   5. Set the administration password (admin_password) configuration key to the password that is associated with the user specified in the previous step.

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

2. Configuring the Interface Driver

   Set the value of the interface_driver configuration key in the /etc/neutron/dhcp_agent.ini file based on the networking plug-in being used. Execute only the configuration step 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. Starting the DHCP Agent

   1. Use the service command to start the neutron-dhcp-agent service.

      # service neutron-dhcp-agent start

   2. Use the chkconfig command to ensure that the neutron-dhcp-agent service will be started automatically in the future.

      # chkconfig neutron-dhcp-agent on