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).