/etc/neutron/dhcp_agent.ini is in neutron-dhcp-agent 1:2014.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Show debugging output in log (sets DEBUG log level output)
# debug = False
# The DHCP agent will resync its state with Neutron to recover from any
# transient notification or rpc errors. The interval is number of
# seconds between attempts.
# resync_interval = 5
# The DHCP agent requires an interface driver be set. Choose the one that best
# matches your plugin.
# interface_driver =
# Example of interface_driver option for OVS based plugins(OVS, Ryu, NEC, NVP,
# BigSwitch/Floodlight)
# interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
# Name of Open vSwitch bridge to use
# ovs_integration_bridge = br-int
# Use veth for an OVS interface or not.
# Support kernels with limited namespace support
# (e.g. RHEL 6.5) so long as ovs_use_veth is set to True.
# ovs_use_veth = False
# Example of interface_driver option for LinuxBridge
# interface_driver = neutron.agent.linux.interface.BridgeInterfaceDriver
# The agent can use other DHCP drivers. Dnsmasq is the simplest and requires
# no additional setup of the DHCP server.
# dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
# Allow overlapping IP (Must have kernel build with CONFIG_NET_NS=y and
# iproute2 package that supports namespaces).
# use_namespaces = True
# The DHCP server can assist with providing metadata support on isolated
# networks. Setting this value to True will cause the DHCP server to append
# specific host routes to the DHCP request. The metadata service will only
# be activated when the subnet does not contain any router port. The guest
# instance must be configured to request host routes via DHCP (Option 121).
# enable_isolated_metadata = False
# Allows for serving metadata requests coming from a dedicated metadata
# access network whose cidr is 169.254.169.254/16 (or larger prefix), and
# is connected to a Neutron router from which the VMs send metadata
# request. In this case DHCP Option 121 will not be injected in VMs, as
# they will be able to reach 169.254.169.254 through a router.
# This option requires enable_isolated_metadata = True
# enable_metadata_network = False
# Number of threads to use during sync process. Should not exceed connection
# pool size configured on server.
# num_sync_threads = 4
# Location to store DHCP server config files
# dhcp_confs = $state_path/dhcp
# Domain to use for building the hostnames
# dhcp_domain = openstacklocal
# Override the default dnsmasq settings with this file
# dnsmasq_config_file =
# Comma-separated list of DNS servers which will be used by dnsmasq
# as forwarders.
# dnsmasq_dns_servers =
# Limit number of leases to prevent a denial-of-service.
# dnsmasq_lease_max = 16777216
# Location to DHCP lease relay UNIX domain socket
# dhcp_lease_relay_socket = $state_path/dhcp/lease_relay
# Location of Metadata Proxy UNIX domain socket
# metadata_proxy_socket = $state_path/metadata_proxy
# dhcp_delete_namespaces, which is false by default, can be set to True if
# namespaces can be deleted cleanly on the host running the dhcp agent.
# Do not enable this until you understand the problem with the Linux iproute
# utility mentioned in https://bugs.launchpad.net/neutron/+bug/1052535 and
# you are sure that your version of iproute does not suffer from the problem.
# If True, namespaces will be deleted when a dhcp server is disabled.
# dhcp_delete_namespaces = False
# Timeout for ovs-vsctl commands.
# If the timeout expires, ovs commands will fail with ALARMCLOCK error.
# ovs_vsctl_timeout = 10
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