Learning OpenStack Networking - Third Edition

Scheduling DHCP services to availability zones

The DHCP service for a given network is something often taken for granted and is not directly seen, let alone configurable, by users or operators via the API. Neutron has scheduled DHCP services across multiple DHCP agents for some time using the following configuration option in the Neutron configuration file at /etc/neutron/neutron.conf:

# Number of DHCP agents scheduled to host a tenant network.# If this number isgreaterthan 1, the scheduler automatically# assigns multiple DHCP agents for a given tenant network,# providing high availability for DHCP service.# (integer value)# dhcp_agents_per_network = 1 

When dhcp_agents_per_network is greater than 1, and more than one DHCP agent exists in ...