Skip to content

Configuration

You can create a file /etc/pihole/pihole-FTL.conf that will be read by FTLDNS on startup.

Possible settings (the option shown first is the default):


DNS settings

BLOCKINGMODE=NULL|IP-NODATA-AAAA|IP|NXDOMAIN

How should FTL reply to blocked queries?
More details

CNAME_DEEP_INSPECT=true|false (PR #663)

Use this option to disable deep CNAME inspection. This might be beneficial for very low-end devices

BLOCK_ESNI=true|false (PR #733)

Encrypted Server Name Indication (ESNI) is certainly a good step into the right direction to enhance privacy on the web. It prevents on-path observers, including ISPs, coffee shop owners and firewalls, from intercepting the TLS Server Name Indication (SNI) extension by encrypting it. This prevents the SNI from being used to determine which websites users are visiting.

ESNI will obviously cause issues for pixelserv-tls which will be unable to generate matching certificates on-the-fly when it cannot read the SNI. Cloudflare and Firefox are already enabling ESNI. According to the IEFT draft (link above), we can easily restore piselserv-tls's operation by replying NXDOMAIN to _esni. subdomains of blocked domains as this mimics a "not configured for this domain" behavior.


Statistics settings

MAXLOGAGE=24.0

Up to how many hours of queries should be imported from the database and logs? Maximum is 24.0

PRIVACYLEVEL=0|1|2|3

Which privacy level is used?
More details

IGNORE_LOCALHOST=no|yes

Should FTL ignore queries coming from the local machine?

AAAA_QUERY_ANALYSIS=yes|no

Should FTL analyze AAAA queries? The DNS server will handle AAAA queries the same way, reglardless of this setting. All this does is ignoring AAAA queries when computing the statistics of Pi-hole. This setting is considered obsolete and may be removed in a future version.

ANALYZE_ONLY_A_AND_AAAA=false|true

Should FTL only analyze A and AAAA queries?


Other settings

SOCKET_LISTENING=localonly|all

Listen only for local socket connections or permit all connections

FTLPORT=4711

On which port should FTL be listening?

RESOLVE_IPV6=yes|no

Should FTL try to resolve IPv6 addresses to hostnames?

RESOLVE_IPV4=yes|no

Should FTL try to resolve IPv4 addresses to hostnames?

DELAY_STARTUP=0 (PR #716)

In certain configurations, you may want FTL to wait a given amount of time before trying to start the DNS revolver. This is typically found when network interfaces appear only late during system startup and the interface startup priorities are configured incorrectly. This setting takes any integer value between 0 and 300 seconds

NICE=-10 (PR #798)

Can be used to change the niceness of Pi-hole FTL. Defaults to -10 and can be disabled altogether by setting a value of -999.

The nice value is an attribute that can be used to influence the CPU scheduler to favor or disfavor a process in scheduling decisions. The range of the nice value varies across UNIX systems. On modern Linux, the range is -20 (high priority = not very nice to other processes) to +19 (low priority).

NAMES_FROM_NETDB=true|false (PR #784)

Control whether FTL should use the fallback option to try to obtain client names from checking the network table. This behavior can be disabled with this option

Assume an IPv6 client without a host names. However, the network table knows - though the client's MAC address - that this is the same device where we have a host name for another IP address (e.g., a DHCP server managed IPv4 address). In this case, we use the host name associated to the other address as this is the same device.

REFRESH_HOSTNAMES=IPV4|ALL|NONE (PR #953)

With this option, you can change how (and if) hourly PTR requests are made to check for changes in client and upstream server hostnames. The following options are available:

  • REFRESH_HOSTNAMES=IPV4 - Do the hourly PTR lookups only for IPv4 addresses This is the new default since Pi-hole FTL v5.3.2. It should resolve issues with more and more very short-lived PE IPv6 addresses coming up in a lot of networks.
  • REFRESH_HOSTNAMES=ALL - Do the hourly PTR lookups for all addresses This is the same as what we're doing with FTL v5.3(.1). This can create a lot of PTR queries for those with many IPv6 addresses in their networks.
  • REFRESH_HOSTNAMES=NONE - Don't do any hourly PTR lookups This means we look host names up exactly once (when we first see a client) and never again. You may miss future changes of host names.

Long-term database settings

Further details concerning the database

DBIMPORT=yes|no

Should FTL load information from the database on startup to be aware of the most recent history?

MAXDBDAYS=365

How long should queries be stored in the database? Setting this to 0 disables the database

DBINTERVAL=1.0

How often do we store queries in FTL's database [minutes]?

DBFILE=/etc/pihole/pihole-FTL.db

Specify the path and filename of FTL's SQLite3 long-term database. Setting this to DBFILE= disables the database altogether


File options

LOGFILE=/var/log/pihole-FTL.log

The location of FTL's log file. If you want to move the log file to a different place, also consider this FAQ article.

PIDFILE=/run/pihole-FTL.pid

The file which contains the PID of FTL's main process.

PORTFILE=/run/pihole-FTL.port

The file containing the port FTL's API is listening on.

SOCKETFILE=/run/pihole/FTL.sock

The file containing the socket FTL's API is listening on.

SETUPVARSFILE=/etc/pihole/setupVars.conf

The config file of Pi-hole containing, e.g., the current blocking status (do not change).

MACVENDORDB=/etc/pihole/macvendor.db

The database containing MAC -> Vendor information for the network table.

GRAVITYDB=/etc/pihole/gravity.db

Specify path and filename of FTL's SQLite3 gravity database. This database contains all domains relevant for Pi-hole's DNS blocking


Debugging options

DEBUG_ALL=false|true

Enable all debug flags. If this is set to true, all other debug config options are ignored.

DEBUG_DATABASE=false|true

Print debugging information about database actions. This prints performed SQL statements as well as some general information such as the time it took to store the queries and how many have been saved to the database.

DEBUG_NETWORKING=false|true

Prints a list of the detected interfaces on the startup of pihole-FTL. Also, prints whether these interfaces are IPv4 or IPv6 interfaces.

DEBUG_LOCKS=false|true

Print information about shared memory locks. Messages will be generated when waiting, obtaining, and releasing a lock.

DEBUG_QUERIES=false|true

Print extensive query information (domains, types, replies, etc.). This has always been part of the legacy debug mode of pihole-FTL.

DEBUG_FLAGS=false|true

Print flags of queries received by the DNS hooks. Only effective when DEBUG_QUERIES is enabled as well.

DEBUG_SHMEM=false|true

Print information about shared memory buffers. Messages are either about creating or enlarging shmem objects or string injections.

DEBUG_GC=false|true

Print information about garbage collection (GC): What is to be removed, how many have been removed and how long did GC take.

DEBUG_ARP=false|true

Print information about ARP table processing: How long did parsing take, whether read MAC addresses are valid, and if the macvendor.db file exists.

DEBUG_REGEX=false|true

Controls if FTLDNS should print extended details about regex matching into pihole-FTL.log.
Due to legacy reasons, we also support the following setting to be used for enabling the same functionality:
REGEX_DEBUGMODE=false|true Note that if one of them is set to true, the other one cannot be used to disable this setting again.
More details

DEBUG_API=false|true

Print extra debugging information during telnet API calls. Currently only used to send extra information when getting all queries.

DEBUG_OVERTIME=false|true

Print information about overTime memory operations, such as initializing or moving overTime slots.

DEBUG_EXTBLOCKED=false|true

Print information about why FTL decided that certain queries were recognized as being externally blocked.

DEBUG_CAPS=false|true

Print information about capabilities granted to the pihole-FTL process. The current capabilities are printed on receipt of SIGHUP, i.e., the current set of capabilities can be queried without restarting pihole-FTL (by setting DEBUG_CAPS=true and thereafter sending killall -HUP pihole-FTL).

DEBUG_DNSMASQ_LINES=false|true

Print file and line causing a dnsmasq event into FTL's log files. This is handy to implement additional hooks missing from FTL.

DEBUG_VECTORS=false|true (PR #725)

FTL uses dynamically allocated vectors for various tasks. This config option enables extensive debugging information such as information about allocation, referencing, deletion, and appending.

DEBUG_RESOLVER=false|true (PR #728)

Extensive information about hostname resolution like which DNS servers are used in the first and second hostname resolving tries (only affecting internally generated PTR queries).


Last update: December 2, 2020