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

The DHCP agent provides DHCP services for the virtual networks.

The metadata agent provides configuration information, such as credentials to instances.

Copy and paste the following crudini commands to configure the L3 agent, DHCP agent, and metadata agent to work with neutron components:

crudini --set /etc/neutron/l3_agent.ini DEFAULT interface_driver 
linuxbridge
    
crudini --set /etc/neutron/dhcp_agent.ini DEFAULT interface_driver 
linuxbridge
    
crudini --set /etc/neutron/dhcp_agent.ini DEFAULT dhcp_driver 
neutron.agent.linux.dhcp.Dnsmasq
    
crudini --set /etc/neutron/dhcp_agent.ini DEFAULT enable_isolated_metadata 
true
    
crudini --set /etc/neutron/metadata_agent.ini DEFAULT nova_metadata_ip 
controller
    
crudini --set /etc/neutron/metadata_agent.ini DEFAULT 
metadata_proxy_shared_secret METADATA_SECRET