/etc/neutron/l3_agent.ini is in neutron-common 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
# L3 requires that 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)
# that supports L3 agent
# interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
# 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
# Allow overlapping IP (Must have kernel build with CONFIG_NET_NS=y and
# iproute2 package that supports namespaces).
# use_namespaces = True
# If use_namespaces is set as False then the agent can only configure one router.
# This is done by setting the specific router_id.
# router_id =
# When external_network_bridge is set, each L3 agent can be associated
# with no more than one external network. This value should be set to the UUID
# of that external network. To allow L3 agent support multiple external
# networks, both the external_network_bridge and gateway_external_network_id
# must be left empty.
# gateway_external_network_id =
# Indicates that this L3 agent should also handle routers that do not have
# an external network gateway configured. This option should be True only
# for a single agent in a Neutron deployment, and may be False for all agents
# if all routers must have an external network gateway
# handle_internal_only_routers = True
# Name of bridge used for external network traffic. This should be set to
# empty value for the linux bridge. when this parameter is set, each L3 agent
# can be associated with no more than one external network.
# external_network_bridge = br-ex
# TCP Port used by Neutron metadata server
# metadata_port = 9697
# Send this many gratuitous ARPs for HA setup. Set it below or equal to 0
# to disable this feature.
# send_arp_for_ha = 0
# seconds between re-sync routers' data if needed
# periodic_interval = 40
# seconds to start to sync routers' data after
# starting agent
# periodic_fuzzy_delay = 5
# enable_metadata_proxy, which is true by default, can be set to False
# if the Nova metadata server is not available
# enable_metadata_proxy = True
# Location of Metadata Proxy UNIX domain socket
# metadata_proxy_socket = $state_path/metadata_proxy
# router_delete_namespaces, which is false by default, can be set to True if
# namespaces can be deleted cleanly on the host running the L3 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 router is destroyed.
# router_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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