configuration.rst

Configuration

Faucet configuration

Faucet is configured with a YAML-based configuration file, faucet.yaml. The following is example demonstrating a few common features:

.. literalinclude:: ../etc/faucet/faucet.yaml
  :language: yaml
  :caption: faucet.yaml
  :name: faucet.yaml

.. literalinclude:: ../etc/faucet/acls.yaml
  :language: yaml
  :caption: acls.yaml
  :name: acls.yaml

The datapath ID may be specified as an integer or hex string (beginning with 0x).

A port not explicitly defined in the YAML configuration file will be left down and will drop all packets.

Configuration options

Top Level

Faucet.yaml

Attribute	Type	Default	Description
acls	dictionary	{}	Configuration specific to acls. The keys are names of each acl, and the values are config dictionaries holding the acl's configuration (see below).
dps	dictionary	{}	Configuration specific to datapaths. The keys are names or dp_ids of each datapath, and the values are config dictionaries holding the datapath's configuration (see below).
meters	dictionary	{}	Configuration specific to meters. The keys are names of each meter, and the values are config dictionaries holding the meter's configuration (see below).
routers	dictionary	{}	Configuration specific to routers. The keys are names of each router, and the values are config dictionaries holding the router's configuration (see below).
version	integer	2	The config version. 2 is the only supported version.
vlans	dictionary	{}	Configuration specific to vlans. The keys are names or vids of each vlan, and the values are config dictionaries holding the vlan's configuration (see below).

DP

DP configuration is entered in the 'dps' configuration block. The 'dps' configuration contains a dictionary of configuration blocks each containing the configuration for one datapath. The keys can either be string names given to the datapath, or the OFP datapath id.

dps: <dp name or id>: {}

Attribute	Type	Default	Description
advertise_interval	integer	30	How often to advertise (eg. IPv6 RAs)
arp_neighbor_timeout	integer	250	ARP and neighbour timeout in seconds
description	string	name	Description of this datapath, strictly informational
dot1x	dictionary	{}	802.1X configuration (see below)
dp_id	integer	The configuration key	The OFP datapath-id of this datapath
drop_broadcast_source_address	boolean	True	If True, Faucet will drop any packet from a broadcast source address
drop_spoofed_faucet_mac	boolean	True	If True, Faucet will drop any packet it receives with an ethernet source address equal to a MAC address that Faucet is using.
group_table	boolean	False	If True, Faucet will use the OpenFlow Group tables to flood packets. This is an experimental feature that is not fully supported by all devices and may not interoperate with all features of faucet.
hardware	string	"Open vSwitch"	The hardware model of the datapath. Defaults to "Open vSwitch". Other options can be seen in the documentation for valve.py
high_priority	integer	low_priority + 1 (9001)	The high priority value.
highest_priority	integer	high_priority + 98 (9099)	The highest priority number to use.
ignore_learn_ins	integer	10	Ignore every approx nth packet for learning. 2 will ignore 1 out of 2 packets; 3 will ignore 1 out of 3 packets. This limits control plane activity when learning new hosts rapidly. Flooding will still be done by the dataplane even with a packet is ignored for learning purposes.
interfaces	dictionary	{}	Configuration block for interface specific config (see below)
interface_ranges	dictionary	{}	Contains the config blocks for sets of multiple interfaces. The configuration entered here will be used as the defaults for these interfaces. The defaults can be overwritten by configuring the interfaces individually, which will also inherit all defaults not specifically configured. For example, if the range specifies tagged_vlans: [1, 2, 3], and the individual interface specifies tagged_vlans: [4], the result will be tagged_vlans: [4]. The format for the configuration key is a comma separated string. The elements can either be the name or number of an interface or a range of port numbers eg: "1-6,8,port9".
learn_ban_timeout	integer	10	When a host is rapidly moving between ports Faucet will stop learning mac addresses on one of the ports for this number of seconds.
learn_jitter	integer	10	In order to reduce load on the controller Faucet will randomly vary the timeout for learnt mac addresses by up to this number of seconds.
lldp_beacon	dictionary	{}	Configuration block for LLDP beacons
low_priority	integer	low_priority + 9000 (9000)	The low priority value.
lowest_priority	integer	priority_offset (0)	The lowest priority number to use.
max_host_fib_retry_count	integer	10	Limit the number of times Faucet will attempt to resolve a next-hop's l2 address.
max_hosts_per_resolve_cycle	integer	5	Limit the number of hosts resolved per cycle.
max_resolve_backoff_time	integer	32	When resolving next hop l2 addresses, Faucet will back off exponentially until it reaches this value.
metrics_rate_limit_sec	integer	0	Rate limit metric updates - don't update metrics if last update was less than this many seconds ago.
name	string	The configuration key	A name to reference the datapath by.
ofchannel_log	string	None	Name of logfile for openflow logs
packetin_pps	integer	None	Ask switch to rate limit packetin in pps.
slowpath_pps	integer	None	Ask switch to rate limit slowpath in pps.
priority_offset	integer	0	Shift all priority values by this number.
proactive_learn_v4	boolean	True	Whether proactive learning is enabled for IPv4 nexthops
proactive_learn_v6	boolean	True	Whether proactive learning is enabled for IPv6 nexthops
stack	dictionary	{}	Configuration block for stacking config, for loop protection (see below)
timeout	integer	300	Timeout for MAC address learning
use_idle_timeout	boolean	False	Turn on/off the use of idle timeout for src_table, default OFF.
table_sizes	dictionary	{}	For TFM based switches, size of each FAUCET table (any may be specified)
port_table_scale_factor	float	1.0	For TFM based switches, and for tables that are sized by number of ports, scale size estimate.
global_vlan	int	2**11-1	When global routing is enabled, FIB VID used internally

Stacking (DP)

Stacking is configured in the dp configuration block and in the interface configuration block. At the dp level the following attributes can be configured within the configuration block 'stack':

dps: <dp name or id>: stack: {}

Attribute	Type	Default	Description
priority	integer	0	Setting any value for stack priority indicates that this datapath should be the root for the stacking topology. When multiple stack DPs have a priority value applied, the root will be chosen as the DP with the lowest priority
down_time_multiple	integer	3	The down_time_multiple value determines the number of root update time intervals for a stack node to be considered healthy when not running.
min_stack_health	float	1.0	Minimum percentage value of required UP stack ports for this stack node to be considered healthy. The default value of 1.0 is considered 100%.
min_lacp_health	float	1.0	Minimum percentage value of required UP stack ports for this stack node to be considered healthy. The default value of 1.0 is considered 100%.

LLDP (DP)

LLDP beacons are configured in the dp and interface configuration blocks.

LLDP beacons can be used to, among other things, facilitate physical troubleshooting (e.g. so that a standard cable tester can display port information), verify FAUCET stacking topology, and cue a phone to use the right voice VLAN.

Note

While FAUCET can receive and log LLDP from other devices, FAUCET does not do spanning tree. Those LLDP packets will have no influence on FAUCET's forwarding decisions.

The following attributes can be configured within the 'lldp_beacon' configuration block at the dp level:

dps: <dp name or id>: lldp_beacon: {}

Attribute	Type	Default	Description
system_name	string	The datapath name	System name inside LLDP packet
send_interval	integer	None	Seconds between sending beacons
max_per_interval	integer	None	The maximum number of beacons, across all ports to send each interval

Note

When stack ports are enabled FAUCET automatically configures LLDP with the default values for send_interval and max_per_interval to 5.

802.1X (DP)

Note

802.1X support is experimental, and there may be incomplete features or bugs. If you find an issue please email the mailing list or create an Github issue.

Faucet implements 802.1X by forwarding EAPOL packets on the dataplane to a socket it is listening on. These packets are then passed through to a RADIUS server which performs the authentication and generates the reply message.

For each instance of Faucet there is only one 802.1X speaker. This 802.1X speaker is configured by the options below. Except for the 'nfv_sw_port' option, the configuration for the speaker is configured using the first dp's dot1x config dictionary. For all other dps only the 'nfv_sw_port' option is required with the others ignored.

A basic network and configuration with two hosts may look like:

A brief overview of the current state of the implementation:

Implemented:

• EAP Types: MD5, PEAP, TLS, TTLS.
• Authentication session expiry default 3600 seconds. (configurable (per authentication) via returning the Session-Timeout attribute in the RADIUS Access-Accept message).
• Faucet connects to a single RADIUS server, and passes through all EAP messages.
• Client can end session with EAP-Logoff.
• Dynamic assignment of the native VLAN. Use RADIUS attribute Private-Group-Tunnel-ID in Radius Access-Accept with the name of the faucet VLAN.

Not Supported (yet):

• RADIUS Accounting.
• Multiple RADIUS Servers.
• Other EAP types. E.g. FAST, ...
• Dynamic assignment of ACL.

802.1X port authentication is configured in the dp configuration block and in the interface configuration block. At the dp level the following attributes can be configured with the configuration block 'dot1x':

dps: <dp name or id>: dot1x: {}

Attribute	Type	Default	Description
nfv_intf	str		The interface for Faucet to listen for EAP packets from the dataplane. - NOTE: Faucet will only use the config from the first dp
nfv_sw_port	int		Switch port number that connects to the Faucet server's nfv_intf
radius_ip	str		IP address of RADIUS Server the 802.1X speaker will authenticate with. - NOTE: Faucet will only use the config from the first dp
radius_port	int	1812	UDP port of RADIUS Server the 802.1X speaker will authenticate with. - NOTE: Faucet will only use the config from the first dp
radius_secret	str		Shared secret used by the RADIUS server and the 802.1X speaker. - NOTE: Faucet will only use the config from the first dp
noauth_acl	str	None	The name of the defined ACL [refer to acls.yaml for more information] that will be set to all 802.1X ports by default, that is before any user is authenticated. - NOTE: Faucet will only use the config from the first dp
auth_acl	str	None	The name of the defined ACL [refer to acls.yaml for more information] that will be set to an 802.1X port when a user authenticates. - NOTE: Faucet will only use the config from the first dp
dot1x_assigned	boolean	False	True, if this ACL can be dynamically assigned by a RADIUS server during 802.1X authentication.

Interfaces

Configuration for each interface is entered in the 'interfaces' configuration block within the config for the datapath. Each interface configuration block is a dictionary keyed by the interface name.

Defaults for groups of interfaces can also be configured under the 'interface-ranges' attribute within the datapath configuration block. These provide default values for a number of interfaces which can be overwritten with the config block for an individual interface. These are keyed with a string containing a comma separated list of OFP port numbers, interface names or with OFP port number ranges (eg. 1-6).

dps: <dp name or id>: interfaces: <interface name or OFP port number>: {}

Attribute	Type	Default	Description
acl_in	integer or string	None	Deprecated, replaced by acls_in which accepts a list. The acl that should be applied to all packets arriving on this port. referenced by name or list index
acls_in	a list of ACLs, as integers or strings	None	A list of ACLs that should be applied to all packets arriving on this port. referenced by name or list index. ACLs listed first take priority over those later in the list.
description	string	Name (which defaults to the configuration key)	Description, purely informational
dot1x	boolean	False	Enable 802.1X port authentication (NOTE: Requires ACL with dot1x_assigned attribute, for 802.1X Per User ACLs)
dot1x_acl	boolean	False	Enable 802.1X ACL functionality on port (NOTE: Requires dot1x attribute)
dot1x_mab	boolean	False	Enable 802.1X Mac Authentication Bypass on port (NOTE: Requires dot1x attribute)
enabled	boolean	True	Allow packets to be forwarded through this port.
hairpin	boolean	False	If True it allows packets arriving on this port to be output to this port. This is necessary to allow routing between two vlans on this port, or for use with a WIFI radio port.
lldp_beacon	dictionary	{}	Configuration block for lldp configuration
loop_protect	boolean	False	if True, do simple (host/access port) loop protection on this port.
loop_protect_external	boolean	False	if True, do external (other switch) loop protection on this port.
max_hosts	integer	255	the maximum number of mac addresses that can be learnt on this port.
mirror	a list of integers or strings	None	Mirror all allowed packets recieved from (subject to ACLs), and all packets transmitted to, the ports specified (by name or by port number), to this port. If mirroring of denied by ACL packets is desired, use the ACL rule mirror option. The mirrored packets are from the perspective of hosts on the mirrored port (for example, a packet with a VLAN tag, transmitted to a host on a mirrored and untagged port, will be mirrored without its original VLAN tag). NOTE: If packets are exchanged between two ports that are both mirrored, depending on the OpenFlow switch, only one copy of the mirrored traffic may be sent (when a port sends a packet, not when the other receives it). This is because some implementations cannot send a packet more than once to the same port.
name	string	The configuration key.	a name to reference this port by.
native_vlan	integer or string	None	The vlan associated with untagged packets arriving and leaving this interface.
number	integer	The configuration key.	The OFP port number for this port.
opstatus_reconf	boolean	True	If True, FAUCET will reconfigure the pipeline based on operational status of the port.
output_only	boolean	False	If True, no packets will be accepted from this port.
permanent_learn	boolean	False	When True Faucet will only learn the first MAC address on this interface. All packets with an ethernet src address not equal to that MAC address will be dropped.
stack	dictionary	None	configuration block for interface level stacking configuration
tagged_vlans	list of integers or strings	None	The vlans associated with tagged packets arriving and leaving this interfaces.
unicast_flood	boolean	True	If False unicast packets will not be flooded to this port.
restricted_bcast_arpnd	boolean	False	If True, this port cannot send non-ARP/IPv6 ND broadcasts to other restricted_bcast_arpnd ports.
coprocessor	dictionary	None	When enabled (strategy: vlan_vid), a packet received on this port is injected directly into the FAUCET pipeline as if it were received on another port. Additionally, if a packet is received with a VLAN corresponding to a port (by default, VID 1001 to port 1 - offset is set with vlan_vid_base) the packet will be output to that port popping the outermost VLAN header.

Stacking (Interfaces)

Stacking port configuration indicates how datapaths are connected when using stacking. The configuration is found under the 'stack' attribute of an interface configuration block. The following attributes can be configured:

dps: <dp name or id>: interfaces: <interface name or port number: stack: {}

Attribute	Type	Default	Description
dp	integer or string	None	The name or dp_id of the dp connected to this port
port	integer or string	None	The name or OFP port number of the interface on the remote dp connected to this interface.

LLDP (Interfaces)

Interface specific configuration for LLDP.

dps: <dp name or id>: interfaces: <interface name or port number: lldp_beacon: {}

Attribute	Type	Default	Description
enable	boolean	False	Enable sending lldp beacons from this interface
org_tlvs	list	[]	Definitions of Organisational TLVs to add to LLDP beacons
port_descr	string	Interface description	Port description to use in beacons from this interface
system_name	string	lldp_beacon (dp) system name	The System Name to use in beacons from this interface

LLDP Organisational TLVs (Interfaces)

Faucet allows defining organisational TLVs for LLDP beacons. These are configured in a list under lldp_beacons/org_tlvs at the interfaces level of configuration.

Each list element contains a dictionary with the following elements:

dps: <dp name or id>: interfaces: <interface name or port number: lldp_beacon: org_tlvs: - {}

Attribute	Type	Default	Description
info	string	None	The info field of the tlv, as a hex string
oui	integer	None	The Organisationally Unique Identifier
subtype	integer	None	The organizationally defined subtype

Router

Routers config is used to allow routing between VLANs, and optionally BGP. Routers configuration is entered in the 'routers' configuration block at the top level of the faucet configuration file. Configuration for each router is an entry in the routers dictionary and is keyed by a name for the router. The following attributes can be configured:

routers: <router name>: {}

Attribute	Type	Default	Description
vlans	list of integers or strings	None	Enables inter-vlan routing on the given VLANs.
bgp	BGP configuration.	None	See below for BGP configuration.

BGP

Routers config to enable BGP routing.

routers: <router name>: {}

Attribute	Type	Default	Description
as	integer	None	The local AS number to used when speaking BGP
connect_mode	string	"passive"	Must be "passive"
neighbor_addresses	list of strings (IP addresses)	None	The list of BGP neighbours
neighbor_as	integer	None	The AS Number for the BGP neighbours
routerid	string (IP address)	None	BGP router ID.
server_addresses	list of strings (IP addresses)	None	IP addresses for FAUCET to listen for incoming BGP addresses.
port	integer	None	Port to use for BGP sessions
vlan	string	None	The VLAN to add/remove BGP routes from.

VLAN

VLANs are configured in the 'vlans' configuration block at the top level of the faucet config file. The config for each vlan is an entry keyed by its vid or a name. The following attributes can be configured:

vlans: <vlan name or vid>: {}

Attribute	Type	Default	Description
acl_in	string or integer	None	Deprecated, replaced by acls_in which accepts a list. The acl to be applied to all packets arriving on this vlan.
acls_in	a list of ACLs, as integers or strings	None	The acl to be applied to all packets arriving on this vlan. ACLs listed first take priority over those later in the list. NOTE: packets from coprocessor port are not subject to vlan acls, because coprocessors intentionally bypass normal input processing including vlan acls and switch/route learning.
description	string	None	Strictly informational
dot1x_assigned	bool	False	True, if this VLAN can be dynamically assigned by a RADIUS server during 802.1X authentication. Otherwise False
faucet_vips	list of strings (IP address prefixes)	None	The IP Address for Faucet's routing interface on this vlan
faucet_mac	string (MAC address)	None	Set MAC for FAUCET VIPs on this VLAN
max_hosts	integer	255	The maximum number of hosts that can be learnt on this vlan.
minimum_ip_size_check	boolean	True	If False, don't check that IP packets have a payload (must be False for OVS trace/tutorial to work)
name	string	the configuration key	A name that can be used to refer to this vlan.
proactive_arp_limit	integer	2052	Do not proactively ARP for hosts once this value has been reached (set to None for unlimited)
proactive_nd_limit	integer	2052	Don't proactively discover IPv6 hosts once this value has been reached (set to None for unlimited)
routes	list of routes	None	Static routes configured on this vlan (see below)
targeted_gw_resolution	boolean	False	If True, and a gateway has been resolved, target the first re-resolution attempt to the same port rather than flooding.
unicast_flood	boolean	True	If False packets to unknown ethernet destination MAC addresses will be dropped rather than flooded.
vid	integer	the configuration key	The vid for the vlan.

Static Routes

Static routes are given as a list. Each entry in the list contains a dictionary keyed with the keyword 'route' and contains a dictionary configuration block as follows:

vlans: <vlan name or vid>: routes: - route: {}

Attribute	Type	Default	Description
ip_dst	string (IP subnet)	None	The destination subnet.
ip_gw	string (IP address)	None	The next hop for this route

Meters

Note

Meters are platform dependent and not all functions may be available.

Meters are configured under the 'meters' configuration block. The meters block contains a dictionary of individual meters each keyed by its name.

meters: <meter name>:

Attribute	Type	Default	Description
meter_id	int		Unique identifier.
entry	dictionary		Defines the meter actions. Details Below.

: meters: <meter name>: entry:

Attribute	Type	Default	Desciption
flags	string or list of strings	KBPS	Possible values are 'KBPS' (Rate value in kb/s (kilo-bit per second).), 'PKTPS' (Rate value in packet/sec.), 'BURST' (Do burst size), 'STATS' (Collect statistics)
bands	list of bands (which are dictionaries, see below)

: meters: <meter name>: entry: bands:

Attribute	Type	Default	Desciption
type	string		'DROP' - drop apckets when the band rate is exceeded, or 'DSCP_REMARK'- use a simple DiffServ policer to remark the DSCP field in the IP header of packets that exceed the band rate.
rate	int		Rate for dropping or remarking packets, depending on the above type. Value is in KBPS or PKTPS flag depending on the flag set.
burst_size	int		Only used if flags includes BURST. Indicates the length of packet or byte burst to consider for applying the meter.
prec_level	int		Only used if type is DSCP_REMARK. The amount by which the drop precedence should be increased.

ACLs

ACLs are configured under the 'acls' configuration block. The acls block contains a dictionary of individual acls each keyed by its name.

Each acl contains a list of rules: a packet will have the first matching rule applied to it.

Each rule is a dictionary containing the single key 'rule' with matches and actions. Matches are key/values based on the ryu RESTFul API. Actions is a dictionary of actions to apply upon match.

Note

When setting allow to true, the packet will be submitted to the next table AFTER having the output actions applied to it.

: acls: <acl name>: - rule: actions: {}

Attribute	Type	Default	Description
allow	boolean	False	If True allow the packet to continue through the Faucet pipeline, if False drop the packet.
force_port_vlan	boolean	False	if True, don't verify VLAN/port association.
cookie	int, 0-2**16	defaults to datapath cookie value	If set, cookie on this flow will be set to this value.
meter	string	None	Meter to apply to the packet
mirror	string or integer	None	Copy the packet, before any modifications, to the specified port (NOTE: ACL mirroring is done in input direction only)
output	dictionary or list	None	Used to apply more specific output actions for an ACL
ct	dictionary	None	Used to apply connection tracking to the specified flow.

The output action contains a dictionary with the following elements:

Note

When using the dictionary format, Faucet will build the actions in the following order: pop_vlans, vlan_vids, swap_vid, vlan_vids, set_fields, port, ports and then failover. The ACL dictionary format also restricts using port & ports, vlan_vid & vlan_vids at the same time.

Note

When using the list format, the output actions will be applied in the user defined order.

: acls: <acl name>: - rule: actions: output: {}

Attribute	Type	Default	Description
set_fields	list of dictionaries	None	A list of fields to set with values, eg. eth_dst: "1:2:3:4:5:6"
port	integer or string	None	The port to output the packet to.
ports	list of [ integer or string ]	None	The list of ports the packet will be output through.
pop_vlans	boolean	False	Pop vlan tag before output.
vlan_vid	integer	False	Push vlan tag before output.
swap_vid	integer	None	Rewrite the vlan vid of the packet when outputting
vlan_vids	list of [ integer or {vid: integer, eth_type: integer} ]	None	Push vlan tags on output, with optional eth_type.
failover	dictionary	None	Output with a failover port (see below).
tunnel	dictionary	None	Generic port output to any port in the stack

Failover is an experimental option, but can be configured as follows:

: acls: <acl name>: - rule: actions: output: failover: {}

Attribute	Type	Default	Description
group_id	integer	None	The OFP group id to use for the failover group
ports	list	None	The list of ports the packet can be output through.

A tunnel ACL will encapsulate a packet before sending it through the stack topology.

Note

Currently tunnel ACLs only support VLAN encapsulation.

: acls: <acl name>: - rule: actions: output: tunnel: {}

Attribute	Type	Default	Description
type	str	'vlan'	The encapsulation type for the packet. Default is to encapsulate using QinQ.
tunnel_id	int/str	VID that is greater than the largest configured VID	The ID for the encapsulation type
dp	int/str	None	The name or dp_id of the dp where the output port belongs
port	int/str	None	The name or port number of the interface on the remote DP to output the packet
exit_instructions	list	None	An additional list of output actions to apply to the packet after decapsulating from the tunnel and before outputting to the destination. This is in the form of the ordered ACL output actions.
maintain_encapsulation	bool	False	Forces the tunnel encapsulation to be kept on the packet upon exiting the tunnel
bi_directional	bool	False	If true, configures a reverse path (from the destination to the source) indicated by a different VLAN_PCP using the same tunnel ID
reverse	bool	False	If true, configures the tunnel to be solely a 'reverse' tunnel. Indicated by a different VLAN_PCP, potentially using a used tunnel ID. This provides a more general reverse tunnel output that can go to a different destination.

Gauge configuration

Gauge is configured similarly with, gauge.yaml. The following is an example demonstrating a few common features:

.. literalinclude:: ../etc/faucet/gauge.yaml
  :language: yaml
  :caption: gauge.yaml
  :name: gauge.yaml

Verifying configuration

You can verify that your configuration is correct with the check_faucet_config script:

check_faucet_config /etc/faucet/faucet.yaml

Configuration examples

For complete working examples of configuration features, see the unit tests, tests/faucet_mininet_test.py. For example, FaucetUntaggedACLTest shows how to configure an ACL to block a TCP port, FaucetTaggedIPv4RouteTest shows how to configure static IPv4 routing.

Applying configuration updates

You can update FAUCET's configuration by sending it a HUP signal. This will cause it to apply the minimum number of flow changes to the switch(es), to implement the change.

pkill -HUP -f faucet.faucet

Configuration in separate files

Extra DP, VLAN or ACL data can also be separated into different files and included into the main configuration file, as shown below. The include field is used for configuration files which are required to be loaded, and Faucet will log an error if there was a problem while loading a file. Files listed on include-optional will simply be skipped and a warning will be logged instead.

Files are parsed in order, and both absolute and relative (to the configuration file) paths are allowed. DPs, VLANs or ACLs defined in subsequent files overwrite previously defined ones with the same name.

faucet.yaml

include:
    - /etc/faucet/dps.yaml
    - /etc/faucet/vlans.yaml

include-optional:
    - acls.yaml

dps.yaml

# Recursive include is allowed, if needed.
# Again, relative paths are relative to this configuration file.
include-optional:
    - override.yaml

dps:
    test-switch-1:
        ...
    test-switch-2:
        ...

Environment variables

You can use environment variables to override default behaviour of faucet such as paths for configuration files and port numbers.

Environment Variable	Type	Default	Description
FAUCET_CONFIG	Colon-separated list of file paths	/etc/faucet/faucet.yaml: /etc/ryu/faucet/faucet.yaml	Faucet will load its configuration from the first valid file in list
FAUCET_STACK_ROOT_STATE_UPDATE_TIME	int	10	Configures the number of seconds to wait before checking stack root health. If the current root is unhealthy, a new root will be nominated. If set to 0, Faucet will not check root node health.
FAUCET_CONFIG_AUTO_REVERT	boolean	False	If true, Faucet will attempt to revert a bad config file back to the last known good version.
FAUCET_CONFIG_STAT_RELOAD	boolean	False	If true, faucet will automatically reload itself and apply new configuration when FAUCET_CONFIG changes
FAUCET_LOG_LEVEL	Python log level	INFO	Log verbosity
FAUCET_LOG	File path or STDOUT or STDERR	/var/log/faucet/ faucet.log	Location for faucet to log messages to, can be special values STDOUT or STDERR
FAUCET_EXCEPTION_LOG	File path or STDOUT or STDERR	/var/log/faucet/ faucet_exception.log	Location for faucet log to log exceptions to, can be special values STDOUT or STDERR
FAUCET_EVENT_SOCK	Socket path		Location to a UNIX socket where faucet will write events to, or empty to disable events
FAUCET_EVENT_SOCK_HEARTBEAT	seconds	0	If set to a value greater than 0, it emits a dummy event every n seconds so that faucet knows if the event socket connection is broken and closes the connection on it's side.
FAUCET_PROMETHEUS_PORT	Port	9302	TCP port to listen on for faucet prometheus client
FAUCET_PROMETHEUS_ADDR	IP address	0.0.0.0	IP address to listen on for faucet prometheus client
GAUGE_CONFIG	Colon-separated list of file paths	/etc/faucet/gauge.yaml: /etc/ryu/faucet/gauge.yaml	Guage will load it's configuration from the first valid file in list
GAUGE_CONFIG_STAT_RELOAD	boolean	False	If true, gauge will automatically reload itself and apply new configuration when GAUGE_CONFIG changes
GAUGE_LOG_LEVEL	Python log level	INFO	Log verbosity
GAUGE_LOG	File path or STDOUT or STDERR	/var/log/faucet/ gauge.log	Location for gauge to log messages to, can be special values STDOUT or STDERR
GAUGE_EXCEPTION_LOG	File path or STDOUT or STDERR	/var/log/faucet/ gauge_exception.log	Location for faucet log to log exceptions to, can be special values STDOUT or STDERR
GAUGE_PROMETHEUS_ADDR	IP address	0.0.0.0	IP address to listen on for gauge prometheus client