1 PowerDNS Recursor Settings
2 ==========================
3 Each setting can appear on the command line, prefixed by '--', or in the configuration file.
4 The command line overrides the configuration file.
6 **Note**: Settings marked as 'Boolean' can either be set to an empty value, which means on, or to 'no' or 'off' which means off.
7 Anything else means on.
11 - ``serve-rfc1918`` on its own means: do serve those zones.
12 - ``serve-rfc1918=off`` or ``serve-rfc1918=no`` means: do not serve those zones.
13 - Anything else means: do serve those zones.
15 .. _setting-allow-from:
19 - IP ranges, separated by commas
20 - Default: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16
22 Netmasks (both IPv4 and IPv6) that are allowed to use the server.
23 The default allows access only from :rfc:`1918` private IP addresses.
24 Due to the aggressive nature of the internet these days, it is highly recommended to not open up the recursor for the entire internet.
25 Questions from IP addresses not listed here are ignored and do not get an answer.
27 .. _setting-allow-from-file:
33 Like `allow-from`_, except reading from file.
34 Overrides the `allow-from`_ setting. To use this feature, supply one netmask per line, with optional comments preceded by a "#".
36 .. _setting-any-to-tcp:
43 Answer questions for the ANY type on UDP with a truncated packet that refers the remote server to TCP.
44 Useful for mitigating ANY reflection attacks.
46 .. _setting-allow-trust-anchor-query:
48 ``allow-trust-anchor-query``
49 ----------------------------
50 .. versionadded:: 4.3.0
55 Allow ``trustanchor.server CH TXT`` and ``negativetrustanchor.server CH TXT`` queries to view the configured :doc:`DNSSEC <dnssec>` (negative) trust anchors.
57 .. _setting-api-config-dir:
61 .. versionadded:: 4.0.0
66 Directory where the REST API stores its configuration and zones.
72 .. versionadded:: 4.0.0
77 Static pre-shared authentication key for access to the REST API.
79 .. _setting-api-readonly:
83 .. versionchanged:: 4.2.0
84 This setting has been removed.
89 Disallow data modification through the REST API when set.
91 .. _setting-api-logfile:
95 .. versionchanged:: 4.2.0
96 This setting has been removed.
101 Location of the server logfile (used by the REST API).
103 .. _setting-auth-can-lower-ttl:
105 ``auth-can-lower-ttl``
106 ----------------------
110 Authoritative zones can transmit a TTL value that is lower than that specified in the parent zone.
111 This is called a 'delegation inconsistency'.
112 To follow :rfc:`RFC 2181 section 5.2<2181#section-5.2>` and :rfc:`5.4 <2181#section-5.4>` to the letter, enable this feature.
113 This will mean a slight deterioration of performance, and it will not solve any problems, but does make the recursor more standards compliant.
114 Not recommended unless you have to tick an 'RFC 2181 compliant' box.
116 .. _setting-auth-zones:
120 - Comma separated list of 'zonename=filename' pairs
122 Zones read from these files (in BIND format) are served authoritatively.
123 DNSSEC is not supported. Example:
127 auth-zones=example.org=/var/zones/example.org, powerdns.com=/var/zones/powerdns.com
129 .. _setting-carbon-interval:
136 If sending carbon updates, this is the interval between them in seconds.
139 .. _setting-carbon-namespace:
143 .. versionadded:: 4.2.0
147 Change the namespace or first string of the metric key. The default is pdns.
149 .. _setting-carbon-ourname:
155 If sending carbon updates, if set, this will override our hostname.
156 Be careful not to include any dots in this setting, unless you know what you are doing.
157 See :ref:`metricscarbon`.
159 .. _setting-carbon-instance:
163 .. versionadded:: 4.2.0
167 Change the instance or third string of the metric key. The default is recursor.
169 .. _setting-carbon-server:
175 If set to an IP or IPv6 address, will send all available metrics to this server via the carbon protocol, which is used by graphite and metronome. Moreover you can specify more than one server using a comma delimited list, ex: carbon-server=10.10.10.10,10.10.10.20.
176 You may specify an alternate port by appending :port, for example: ``127.0.0.1:2004``.
183 - Path to a Directory
185 If set, chroot to this directory for more security.
188 Make sure that ``/dev/log`` is available from within the chroot.
189 Logging will silently fail over time otherwise (on logrotate).
191 When using ``chroot``, all other paths (except for `config-dir`_) set in the configuration are relative to the new root.
193 When using ``chroot`` and the API (`webserver`_), `api-readonly`_ **must** be set and `api-config-dir`_ unset.
195 When running on a system where systemd manages services, ``chroot`` does not work out of the box, as PowerDNS cannot use the ``NOTIFY_SOCKET``.
196 Either do not ``chroot`` on these systems or set the 'Type' of this service to 'simple' instead of 'notify' (refer to the systemd documentation on how to modify unit-files).
198 .. _setting-client-tcp-timeout:
200 ``client-tcp-timeout``
201 ----------------------
205 Time to wait for data from TCP clients.
207 .. _setting-config-dir:
213 Location of configuration directory (``recursor.conf``).
214 Usually ``/etc/powerdns``, but this depends on ``SYSCONFDIR`` during compile-time.
216 .. _setting-config-name:
223 When running multiple recursors on the same server, read settings from :file:`recursor-{name}.conf`, this will also rename the binary image.
229 .. versionadded:: 4.1.0
234 Set CPU affinity for worker threads, asking the scheduler to run those threads on a single CPU, or a set of CPUs.
235 This parameter accepts a space separated list of thread-id=cpu-id, or thread-id=cpu-id-1,cpu-id-2,...,cpu-id-N.
236 For example, to make the worker thread 0 run on CPU id 0 and the worker thread 1 on CPUs 1 and 2::
240 The number of worker threads is determined by the :ref:`setting-threads` setting.
241 If :ref:`setting-pdns-distributes-queries` is set, an additional thread is started, assigned the id 0,
242 and is the only one listening on client sockets and accepting queries, distributing them to the other worker threads afterwards.
244 Starting with version 4.2.0, the thread handling the control channel, the webserver and other internal stuff has been assigned
245 id 0 and more than one distributor thread can be started using the :ref:`setting-distributor-threads` setting, so the distributor
246 threads if any are assigned id 1 and counting, and the other threads follow behind.
248 This parameter is only available on OS that provides the `pthread_setaffinity_np()` function.
257 .. versionchanged:: 4.0.0
259 Default is now "no", was "yes" before.
261 Operate in the background.
263 .. _setting-delegation-only:
267 - Domains, comma separated
269 Which domains we only accept delegations from (a Verisign special).
271 .. _setting-dont-throttle-names:
273 ``dont-throttle-names``
274 ----------------------------
275 .. versionadded:: 4.2.0
277 - Comma separated list of domain-names
280 When an authoritative server does not answer a query or sends a reply the recursor does not like, it is throttled.
281 Any servers' name suffix-matching the supplied names will never be throttled.
284 Most servers on the internet do not respond for a good reason (overloaded or unreachable), ``dont-throttle-names`` could make this load on the upstream server even higher, resulting in further service degradation.
286 .. _setting-dont-throttle-netmasks:
288 ``dont-throttle-netmasks``
289 ----------------------------
290 .. versionadded:: 4.2.0
292 - Comma separated list of netmasks
295 When an authoritative server does not answer a query or sends a reply the recursor does not like, it is throttled.
296 Any servers matching the supplied netmasks will never be throttled.
298 This can come in handy on lossy networks when forwarding, where the same server is configured multiple times (e.g. with ``forward-zones-recurse=example.com=192.0.2.1;192.0.2.1``).
299 By default, the PowerDNS Recursor would throttle the "first" server on a timeout and hence not retry the "second" one.
300 In this case, ``dont-throttle-netmasks`` could be set to ``192.0.2.1``.
303 Most servers on the internet do not respond for a good reason (overloaded or unreachable), ``dont-throttle-netmasks`` could make this load on the upstream server even higher, resulting in further service degradation.
305 .. _setting-disable-packetcache:
307 ``disable-packetcache``
308 -----------------------
312 Turn off the packet cache. Useful when running with Lua scripts that can
315 .. _setting-disable-syslog:
322 Do not log to syslog, only to stdout.
323 Use this setting when running inside a supervisor that handles logging (like systemd).
324 **Note**: do not use this setting in combination with `daemon`_ as all logging will disappear.
326 .. _setting-distribution-load-factor:
328 ``distribution-load-factor``
329 ----------------------------
330 .. versionadded:: 4.1.12
335 If `pdns-distributes-queries`_ is set and this setting is set to another value
336 than 0, the distributor thread will use a bounded load-balancing algorithm while
337 distributing queries to worker threads, making sure that no thread is assigned
338 more queries than distribution-load-factor times the average number of queries
339 currently processed by all the workers.
340 For example, with a value of 1.25, no server should get more than 125 % of the
341 average load. This helps making sure that all the workers have roughly the same
342 share of queries, even if the incoming traffic is very skewed, with a larger
343 number of requests asking for the same qname.
345 .. _setting-distribution-pipe-buffer-size:
347 ``distribution-pipe-buffer-size``
348 ---------------------------------
349 .. versionadded:: 4.2.0
354 Size in bytes of the internal buffer of the pipe used by the distributor to pass incoming queries to a worker thread.
355 Requires support for `F_SETPIPE_SZ` which is present in Linux since 2.6.35. The actual size might be rounded up to
356 a multiple of a page size. 0 means that the OS default size is used.
357 A large buffer might allow the recursor to deal with very short-lived load spikes during which a worker thread gets
358 overloaded, but it will be at the cost of an increased latency.
360 .. _setting-distributor-threads:
362 ``distributor-threads``
363 -----------------------
364 .. versionadded:: 4.2.0
367 - Default: 1 if `pdns-distributes-queries`_ is set, 0 otherwise
369 If `pdns-distributes-queries`_ is set, spawn this number of distributor threads on startup. Distributor threads
370 handle incoming queries and distribute them to other threads based on a hash of the query, to maximize the cache hit
377 .. versionadded:: 4.0.0
379 - One of ``off``, ``process-no-validate``, ``process``, ``log-fail``, ``validate``, String
380 - Default: ``process-no-validate``
382 Set the mode for DNSSEC processing:
386 No DNSSEC processing whatsoever.
387 Ignore DO-bits in queries, don't request any DNSSEC information from authoritative servers.
388 This behaviour is similar to PowerDNS Recursor pre-4.0.
392 Respond with DNSSEC records to clients that ask for it, set the DO bit on all outgoing queries.
393 Don't do any validation.
397 Respond with DNSSEC records to clients that ask for it, set the DO bit on all outgoing queries.
398 Do validation for clients that request it (by means of the AD- bit or DO-bit in the query).
402 Similar behaviour to ``process``, but validate RRSIGs on responses and log bogus responses.
406 Full blown DNSSEC validation. Send SERVFAIL to clients on bogus responses.
408 .. _setting-dnssec-log-bogus:
415 Log every DNSSEC validation failure.
416 **Note**: This is not logged per-query but every time records are validated as Bogus.
418 .. _setting-dont-query:
422 - Netmasks, comma separated
423 - Default: 127.0.0.0/8, 10.0.0.0/8, 100.64.0.0/10, 169.254.0.0/16, 192.168.0.0/16, 172.16.0.0/12, ::1/128, fc00::/7, fe80::/10, 0.0.0.0/8, 192.0.0.0/24, 192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24, 240.0.0.0/4, ::/96, ::ffff:0:0/96, 100::/64, 2001:db8::/32
425 The DNS is a public database, but sometimes contains delegations to private IP addresses, like for example 127.0.0.1.
426 This can have odd effects, depending on your network, and may even be a security risk.
427 Therefore, the PowerDNS Recursor by default does not query private space IP addresses.
428 This setting can be used to expand or reduce the limitations.
430 Queries to addresses for zones as configured in any of the settings `forward-zones`_, `forward-zones-file`_ or `forward-zones-recurse`_ are performed regardless of these limitations.
432 .. _setting-ecs-add-for:
436 .. versionadded:: 4.2.0
438 - Comma separated list of netmasks
439 - Default: 0.0.0.0/0, ::, !127.0.0.0/8, !10.0.0.0/8, !100.64.0.0/10, !169.254.0.0/16, !192.168.0.0/16, !172.16.0.0/12, !::1/128, !fc00::/7, !fe80::/10
441 List of requestor netmasks for which the requestor IP Address should be used as the :rfc:`EDNS Client Subnet <7871>` for outgoing queries. Outgoing queries for requestors that do not match this list will use the `ecs-scope-zero-address`_ instead.
442 Valid incoming ECS values from `use-incoming-edns-subnet`_ are not replaced.
444 Regardless of the value of this setting, ECS values are only sent for outgoing queries matching the conditions in the `edns-subnet-whitelist`_ setting. This setting only controls the actual value being sent.
446 This defaults to not using the requestor address inside RFC1918 and similar "private" IP address spaces.
448 .. _setting-ecs-ipv4-bits:
452 .. versionadded:: 4.1.0
457 Number of bits of client IPv4 address to pass when sending EDNS Client Subnet address information.
459 .. _setting-ecs-ipv4-cache-bits:
461 ``ecs-ipv4-cache-bits``
462 -----------------------
463 .. versionadded:: 4.1.12
468 Maximum number of bits of client IPv4 address used by the authoritative server (as indicated by the EDNS Client Subnet scope in the answer) for an answer to be inserted into the query cache. This condition applies in conjunction with ``ecs-cache-limit-ttl``.
469 That is, only if both the limits apply, the record will not be cached.
471 .. _setting-ecs-ipv6-bits:
475 .. versionadded:: 4.1.0
480 Number of bits of client IPv6 address to pass when sending EDNS Client Subnet address information.
482 .. _setting-ecs-ipv6-cache-bits:
484 ``ecs-ipv6-cache-bits``
485 -----------------------
486 .. versionadded:: 4.1.12
491 Maximum number of bits of client IPv6 address used by the authoritative server (as indicated by the EDNS Client Subnet scope in the answer) for an answer to be inserted into the query cache. This condition applies in conjunction with ``ecs-cache-limit-ttl``.
492 That is, only if both the limits apply, the record will not be cached.
494 .. _setting-ecs-minimum-ttl-override:
496 ``ecs-minimum-ttl-override``
497 ----------------------------
499 - Default: 0 (disabled)
501 This setting artificially raises the TTLs of records in the ANSWER section of ECS-specific answers to be at least this long.
502 While this is a gross hack, and violates RFCs, under conditions of DoS, it may enable you to continue serving your customers.
503 Can be set at runtime using ``rec_control set-ecs-minimum-ttl 3600``.
505 .. _setting-ecs-cache-limit-ttl:
507 ``ecs-cache-limit-ttl``
508 -----------------------
509 .. versionadded:: 4.1.12
512 - Default: 0 (disabled)
514 The minimum TTL for an ECS-specific answer to be inserted into the query cache. This condition applies in conjunction with ``ecs-ipv4-cache-bits`` or ``ecs-ipv6-cache-bits``.
515 That is, only if both the limits apply, the record will not be cached.
517 .. _setting-ecs-scope-zero-address:
519 ``ecs-scope-zero-address``
520 --------------------------
521 .. versionadded:: 4.1.0
523 - IPv4 or IPv6 Address
526 The IP address sent via EDNS Client Subnet to authoritative servers listed in
527 `edns-subnet-whitelist`_ when `use-incoming-edns-subnet`_ is set and the query has
528 an ECS source prefix-length set to 0.
529 The default is to look for the first usable (not an ``any`` one) address in
530 `query-local-address`_ then `query-local-address6`_. If no suitable address is
531 found, the recursor fallbacks to sending 127.0.0.1.
533 .. _setting-edns-outgoing-bufsize:
535 ``edns-outgoing-bufsize``
536 -------------------------
537 .. versionchanged:: 4.2.0
538 Before 4.2.0, the default was 1680
545 1232 is the largest number of payload bytes that can fit in the smallest IPv6 packet.
546 IPv6 has a minimum MTU of 1280 bytes (:rfc:`RFC 8200, section 5 <8200#section-5>`), minus 40 bytes for the IPv6 header, minus 8 bytes for the UDP header gives 1232, the maximum payload size for the DNS response.
548 This is the value set for the EDNS0 buffer size in outgoing packets.
549 Lower this if you experience timeouts.
551 .. _setting-edns-subnet-whitelist:
553 ``edns-subnet-whitelist``
554 -------------------------
555 - Comma separated list of domain names and netmasks
558 List of netmasks and domains that :rfc:`EDNS Client Subnet <7871>` should be enabled for in outgoing queries.
560 For example, an EDNS Client Subnet option containing the address of the initial requestor (but see `ecs-add-for`_) will be added to an outgoing query sent to server 192.0.2.1 for domain X if 192.0.2.1 matches one of the supplied netmasks, or if X matches one of the supplied domains.
561 The initial requestor address will be truncated to 24 bits for IPv4 (see `ecs-ipv4-bits`_) and to 56 bits for IPv6 (see `ecs-ipv6-bits`_), as recommended in the privacy section of RFC 7871.
563 By default, this option is empty, meaning no EDNS Client Subnet information is sent.
565 .. _setting-entropy-source:
570 - Default: /dev/urandom
572 PowerDNS can read entropy from a (hardware) source.
573 This is used for generating random numbers which are very hard to predict.
574 Generally on UNIX platforms, this source will be ``/dev/urandom``, which will always supply random numbers, even if entropy is lacking.
575 Change to ``/dev/random`` if PowerDNS should block waiting for enough entropy to arrive.
577 .. _setting-etc-hosts-file:
582 - Default: /etc/hosts
584 The path to the /etc/hosts file, or equivalent.
585 This file can be used to serve data authoritatively using `export-etc-hosts`_.
587 .. _setting-export-etc-hosts:
594 If set, this flag will export the host names and IP addresses mentioned in ``/etc/hosts``.
596 .. _setting-export-etc-hosts-search-suffix:
598 ``export-etc-hosts-search-suffix``
599 ----------------------------------
602 If set, all hostnames in the `export-etc-hosts`_ file are loaded in canonical form, based on this suffix, unless the name contains a '.', in which case the name is unchanged.
603 So an entry called 'pc' with ``export-etc-hosts-search-suffix='home.com'`` will lead to the generation of 'pc.home.com' within the recursor.
604 An entry called 'server1.home' will be stored as 'server1.home', regardless of this setting.
606 .. _setting-forward-zones:
610 - 'zonename=IP' pairs, comma separated
612 Queries for zones listed here will be forwarded to the IP address listed. i.e.
616 forward-zones=example.org=203.0.113.210, powerdns.com=2001:DB8::BEEF:5
618 Multiple IP addresses can be specified and port numbers other than 53 can be configured:
622 forward-zones=example.org=203.0.113.210:5300;127.0.0.1, powerdns.com=127.0.0.1;198.51.100.10:530;[2001:DB8::1:3]:5300
624 Forwarded queries have the 'recursion desired' bit set to 0, meaning that this setting is intended to forward queries to authoritative servers.
626 **IMPORTANT**: When using DNSSEC validation (which is default), forwards to non-delegated (e.g. internal) zones that have a DNSSEC signed parent zone will validate as Bogus.
627 To prevent this, add a Negative Trust Anchor (NTA) for this zone in the `lua-config-file`_ with ``addNTA("your.zone", "A comment")``.
628 If this forwarded zone is signed, instead of adding NTA, add the DS record to the `lua-config-file`_.
629 See the :doc:`dnssec` information.
631 .. _setting-forward-zones-file:
633 ``forward-zones-file``
634 ----------------------
637 Same as `forward-zones`_, parsed from a file. Only 1 zone is allowed per line, specified as follows:
641 example.org=203.0.113.210, 192.0.2.4:5300
643 Zones prefixed with a '+' are forwarded with the recursion-desired bit set, for which see `forward-zones-recurse`_.
644 Default behaviour without '+' is as with `forward-zones`_.
646 .. versionchanged:: 4.0.0
648 Comments are allowed, everything behind '#' is ignored.
650 The DNSSEC notes from `forward-zones`_ apply here as well.
652 .. _setting-forward-zones-recurse:
654 ``forward-zones-recurse``
655 -------------------------
656 - 'zonename=IP' pairs, comma separated
658 Like regular `forward-zones`_, but forwarded queries have the 'recursion desired' bit set to 1, meaning that this setting is intended to forward queries to other recursive servers.
660 The DNSSEC notes from `forward-zones`_ apply here as well.
662 .. _setting-gettag-needs-edns-options:
664 ``gettag-needs-edns-options``
665 -----------------------------
666 .. versionadded:: 4.1.0
671 If set, EDNS options in incoming queries are extracted and passed to the :func:`gettag` hook in the ``ednsoptions`` table.
673 .. _setting-hint-file:
679 If set, the root-hints are read from this file. If unset, default root hints are used.
681 .. _setting-include-dir:
687 Directory to scan for additional config files. All files that end with .conf are loaded in order using ``POSIX`` as locale.
689 .. _setting-latency-statistic-size:
691 ``latency-statistic-size``
692 --------------------------
696 Indication of how many queries will be averaged to get the average latency reported by the 'qa-latency' metric.
698 .. _setting-local-address:
702 - IP addresses, comma separated
705 Local IPv4 or IPv6 addresses to bind to.
706 Addresses can also contain port numbers, for IPv4 specify like this: ``192.0.2.4:5300``, for IPv6: ``[::1]:5300``.
708 **Warning**: When binding to wildcard addresses, UNIX semantics mean that answers may not be sent from the address a query was received on.
709 It is highly recommended to bind to explicit addresses.
711 .. _setting-local-port:
718 Local port to bind to.
719 If an address in `local-address`_ does not have an explicit port, this port is used.
721 .. _setting-log-timestamp:
726 .. versionadded:: 4.1.0
731 When printing log lines to stdout, prefix them with timestamps.
732 Disable this if the process supervisor timestamps these lines already.
735 The systemd unit file supplied with the source code already disables timestamp printing
737 .. _setting-non-local-bind:
744 Bind to addresses even if one or more of the `local-address`_'s do not exist on this server.
745 Setting this option will enable the needed socket options to allow binding to non-local addresses.
746 This feature is intended to facilitate ip-failover setups, but it may also mask configuration issues and for this reason it is disabled by default.
748 .. _setting-loglevel:
752 - Integer between 0 and 9
756 Higher is more, more logging may destroy performance.
757 It is recommended not to set this below 3.
759 .. _setting-log-common-errors:
761 ``log-common-errors``
762 ---------------------
766 Some DNS errors occur rather frequently and are no cause for alarm.
770 .. versionadded:: 4.1.0
775 Log additions and removals to RPZ zones at Info (6) level instead of Debug (7).
777 .. _setting-logging-facility:
783 If set to a digit, logging is performed under this LOCAL facility.
785 Do not pass names like 'local0'!
787 .. _setting-lowercase-outgoing:
789 ``lowercase-outgoing``
790 ----------------------
794 Set to true to lowercase the outgoing queries.
795 When set to 'no' (the default) a query from a client using mixed case in the DNS labels (such as a user entering mixed-case names or `draft-vixie-dnsext-dns0x20-00 <http://tools.ietf.org/html/draft-vixie-dnsext-dns0x20-00>`_), PowerDNS preserves the case of the query.
796 Broken authoritative servers might give a wrong or broken answer on this encoding.
797 Setting ``lowercase-outgoing`` to 'yes' makes the PowerDNS Recursor lowercase all the labels in the query to the authoritative servers, but still return the proper case to the client requesting.
799 .. _setting-lua-config-file:
805 If set, and Lua support is compiled in, this will load an additional configuration file for newer features and more complicated setups.
806 See :doc:`lua-config/index` for the options that can be set in this file.
808 .. _setting-lua-dns-script:
815 Path to a lua file to manipulate the Recursor's answers. See :doc:`lua-scripting/index` for more information.
817 .. _setting-maintenance-interval:
819 ``lua-maintenance-interval``
820 ----------------------------
821 .. versionadded:: 4.2.0
827 The interval between calls to the Lua user defined `maintenance()` function in seconds.
828 See :ref:`hooks-maintenance-callback`
830 .. _setting-max-cache-bogus-ttl:
832 ``max-cache-bogus-ttl``
833 -----------------------
834 .. versionadded:: 4.2.0
839 Maximum number of seconds to cache an item in the DNS cache (negative or positive) if its DNSSEC validation failed, no matter what the original TTL specified, to reduce the impact of a broken domain.
841 .. _setting-max-cache-entries:
843 ``max-cache-entries``
844 ---------------------
848 Maximum number of DNS cache entries.
849 1 million per thread will generally suffice for most installations.
851 .. _setting-max-cache-ttl:
858 Maximum number of seconds to cache an item in the DNS cache, no matter what the original TTL specified.
860 .. versionchanged:: 4.1.0
862 The minimum value of this setting is 15. i.e. setting this to lower than 15 will make this value 15.
864 .. _setting max-concurrent-requests-per-tcp-connection:
866 ``max-concurrent-requests-per-tcp-connection``
867 ----------------------------------------------
871 Maximum number of incoming requests handled concurrently per tcp
872 connection. This number must be larger than 0 and smaller than 65536
873 and also smaller than `max-mthreads`.
875 .. _setting-max-generate-steps:
877 ``max-generate-steps``
878 ----------------------
880 .. versionadded:: 4.3.0
885 Maximum number of steps for a '$GENERATE' directive when parsing a
886 zone file. This is a protection measure to prevent consuming a lot of
887 CPU and memory when untrusted zones are loaded. Default to 0 which
890 .. _setting-max-mthreads:
897 Maximum number of simultaneous MTasker threads.
899 .. _setting-max-packetcache-entries:
901 ``max-packetcache-entries``
902 ---------------------------
906 Maximum number of Packet Cache entries.
907 1 million per thread will generally suffice for most installations.
909 .. _setting-max-qperq:
916 The maximum number of outgoing queries that will be sent out during the resolution of a single client query.
917 This is used to limit endlessly chasing CNAME redirections.
919 .. _setting-max-negative-ttl:
926 A query for which there is authoritatively no answer is cached to quickly deny a record's existence later on, without putting a heavy load on the remote server.
927 In practice, caches can become saturated with hundreds of thousands of hosts which are tried only once.
928 This setting, which defaults to 3600 seconds, puts a maximum on the amount of time negative entries are cached.
930 .. _setting-max-recursion-depth:
932 ``max-recursion-depth``
933 -----------------------
937 Total maximum number of internal recursion calls the server may use to answer a single query.
939 The value of `stack-size`_ should be increased together with this one to prevent the stack from overflowing.
941 .. versionchanged:: 4.1.0
943 Before 4.1.0, this settings was unlimited.
945 .. _setting-max-tcp-clients:
952 Maximum number of simultaneous incoming TCP connections allowed.
954 .. _setting-max-tcp-per-client:
956 ``max-tcp-per-client``
957 ----------------------
959 - Default: 0 (unlimited)
961 Maximum number of simultaneous incoming TCP connections allowed per client (remote IP address).
963 .. _setting-max-tcp-queries-per-connection:
965 ``max-tcp-queries-per-connection``
966 ----------------------------------
967 .. versionadded:: 4.1.0
970 - Default: 0 (unlimited)
972 Maximum number of DNS queries in a TCP connection.
974 .. _setting-max-total-msec:
981 Total maximum number of milliseconds of wallclock time the server may use to answer a single query.
983 .. _setting-max-udp-queries-per-round:
985 ``max-udp-queries-per-round``
986 ----------------------------------
987 .. versionadded:: 4.1.4
992 Under heavy load the recursor might be busy processing incoming UDP queries for a long while before there is no more of these, and might therefore
993 neglect scheduling new ``mthreads``, handling responses from authoritative servers or responding to :doc:`rec_control <manpages/rec_control.1>`
995 This setting caps the maximum number of incoming UDP DNS queries processed in a single round of looping on ``recvmsg()`` after being woken up by the multiplexer, before
996 returning back to normal processing and handling other events.
998 .. _setting-minimum-ttl-override:
1000 ``minimum-ttl-override``
1001 ------------------------
1003 - Default: 0 (disabled)
1005 This setting artificially raises all TTLs to be at least this long.
1006 While this is a gross hack, and violates RFCs, under conditions of DoS, it may enable you to continue serving your customers.
1007 Can be set at runtime using ``rec_control set-minimum-ttl 3600``.
1009 .. _setting-new-domain-tracking:
1011 ``new-domain-tracking``
1012 -----------------------
1013 .. versionadded:: 4.2.0
1016 - Default: no (disabled)
1018 Whether to track newly observed domains, i.e. never seen before. This
1019 is a probablistic algorithm, using a stable bloom filter to store
1020 records of previously seen domains. When enabled for the first time,
1021 all domains will appear to be newly observed, so the feature is best
1022 left enabled for e.g. a week or longer before using the results. Note
1023 that this feature is optional and must be enabled at compile-time,
1024 thus it may not be available in all pre-built packages.
1025 If protobuf is enabled and configured, then the newly observed domain
1026 status will appear as a flag in Response messages.
1028 .. _setting-new-domain-log:
1032 .. versionadded:: 4.2.0
1035 - Default: yes (enabled)
1037 If a newly observed domain is detected, log that domain in the
1038 recursor log file. The log line looks something like::
1040 Jul 18 11:31:25 Newly observed domain nod=sdfoijdfio.com
1042 .. _setting-new-domain-lookup:
1044 ``new-domain-lookup``
1045 ---------------------
1046 .. versionadded:: 4.2.0
1049 - Example: nod.powerdns.com
1051 If a domain is specified, then each time a newly observed domain is
1052 detected, the recursor will perform an A record lookup of "<newly
1053 observed domain>.<lookup domain>". For example if 'new-domain-lookup'
1054 is configured as 'nod.powerdns.com', and a new domain 'xyz123.tv' is
1055 detected, then an A record lookup will be made for
1056 'xyz123.tv.nod.powerdns.com'. This feature gives a way to share the
1057 newly observed domain with partners, vendors or security teams. The
1058 result of the DNS lookup will be ignored by the recursor.
1060 .. _setting-new-domain-db-size:
1062 ``new-domain-db-size``
1063 ----------------------
1064 .. versionadded:: 4.2.0
1069 The default size of the stable bloom filter used to store previously
1070 observed domains is 67108864. To change the number of cells, use this
1071 setting. For each cell, the SBF uses 1 bit of memory, and one byte of
1072 disk for the persistent file.
1073 If there are already persistent files saved to disk, this setting will
1074 have no effect unless you remove the existing files.
1076 .. _setting-new-domain-history-dir:
1078 ``new-domain-history-dir``
1079 --------------------------
1080 .. versionadded:: 4.2.0
1084 This setting controls which directory is used to store the on-disk
1085 cache of previously observed domains.
1087 The default depends on ``LOCALSTATEDIR`` when building the software.
1088 Usually this comes down to ``/var/lib/pdns-recursor/nod`` or ``/usr/local/var/lib/pdns-recursor/nod``).
1090 The newly observed domain feature uses a stable bloom filter to store
1091 a history of previously observed domains. The data structure is
1092 synchronized to disk every 10 minutes, and is also initialized from
1093 disk on startup. This ensures that previously observed domains are
1094 preserved across recursor restarts.
1095 If you change the new-domain-db-size setting, you must remove any files
1096 from this directory.
1098 .. _setting-new-domain-whitelist:
1100 ``new-domain-whitelist``
1101 ------------------------
1102 .. versionadded:: 4.2.0
1104 - List of Domain Names, comma separated
1105 - Example: xyz.com, abc.com
1107 This setting is a list of all domains (and implicitly all subdomains)
1108 that will never be considered a new domain. For example, if the domain
1109 'xyz123.tv' is in the list, then 'foo.bar.xyz123.tv' will never be
1110 considered a new domain. One use-case for the whitelist is to never
1111 reveal details of internal subdomains via the new-domain-lookup
1114 .. _setting-new-domain-pb-tag:
1116 ``new-domain-pb-tag``
1117 ---------------------
1118 .. versionadded:: 4.2.0
1123 If protobuf is configured, then this tag will be added to all protobuf response messages when
1124 a new domain is observed.
1126 .. _setting-network-timeout:
1133 Number of milliseconds to wait for a remote authoritative server to respond.
1135 .. _setting-nothing-below-nxdomain:
1137 ``nothing-below-nxdomain``
1138 --------------------------
1139 .. versionadded:: 4.3.0
1141 - One of ``no``, ``dnssec``, ``yes``, String
1142 - Default: ``dnssec``
1144 The type of :rfc:`8020` handling using cached NXDOMAIN responses.
1145 This RFC specifies that NXDOMAIN means that the DNS tree under the denied name MUST be empty.
1146 When an NXDOMAIN exists in the cache for a shorter name than the qname, no lookup is done and an NXDOMAIN is sent to the client.
1148 For instance, when ``foo.example.net`` is negatively cached, any query
1149 matching ``*.foo.example.net`` will be answered with NXDOMAIN directly
1150 without consulting authoritative servers.
1154 No :rfc:`8020` processing is done.
1158 :rfc:`8020` processing is only done using cached NXDOMAIN records that are
1163 :rfc:`8020` processing is done using any non-Bogus NXDOMAIN record
1164 available in the cache.
1166 .. _setting-nsec3-max-iterations:
1168 ``nsec3-max-iterations``
1169 ------------------------
1170 .. versionadded:: 4.1.0
1175 Maximum number of iterations allowed for an NSEC3 record.
1176 If an answer containing an NSEC3 record with more iterations is received, its DNSSEC validation status is treated as Insecure.
1178 .. _setting-packetcache-ttl:
1185 Maximum number of seconds to cache an item in the packet cache, no matter what the original TTL specified.
1187 .. _setting-packetcache-servfail-ttl:
1189 ``packetcache-servfail-ttl``
1190 ----------------------------
1194 Maximum number of seconds to cache a 'server failure' answer in the packet cache.
1196 .. versionchanged:: 4.0.0
1198 This setting's maximum is capped to `packetcache-ttl`_.
1199 i.e. setting ``packetcache-ttl=15`` and keeping ``packetcache-servfail-ttl`` at the default will lower ``packetcache-servfail-ttl`` to ``15``.
1201 .. _setting-pdns-distributes-queries:
1203 ``pdns-distributes-queries``
1204 ----------------------------
1208 If set, PowerDNS will have only 1 thread listening on client sockets, and distribute work by itself over threads by using a hash of the query,
1209 maximizing the cache hit ratio. Starting with version 4.2.0, more than one distributing thread can be started using the `distributor-threads`_
1211 Improves performance on Linux.
1213 .. _setting-protobuf-use-kernel-timestamp:
1215 ``protobuf-use-kernel-timestamp``
1216 ---------------------------------
1217 .. versionadded:: 4.2.0
1222 Whether to compute the latency of responses in protobuf messages using the timestamp set by the kernel when the query packet was received (when available), instead of computing it based on the moment we start processing the query.
1224 .. _setting-public-suffix-list-file:
1226 ``public-suffix-list-file``
1227 ---------------------------
1228 .. versionadded:: 4.2.0
1233 Path to the Public Suffix List file, if any. If set, PowerDNS will try to load the Public Suffix List from this file instead of using the built-in list. The PSL is used to group the queries by relevant domain names when displaying the top queries.
1235 .. _setting-qname-minimization:
1237 ``qname-minimization``
1238 ----------------------
1239 .. versionadded:: 4.3.0
1244 Enable Query Name Minimization. This is a experimental feature, implementing a relaxed form of Query Name Mimimization as
1245 described in :rfc:`7816`.
1247 .. _setting-query-local-address:
1249 ``query-local-address``
1250 -----------------------
1251 - IPv4 Address, comma separated
1254 Send out local queries from this address, or addresses, by adding multiple addresses, increased spoofing resilience is achieved.
1256 .. _setting-query-local-address6:
1258 ``query-local-address6``
1259 ------------------------
1260 - IPv6 addresses, comma separated
1263 Send out local IPv6 queries from this address or addresses.
1264 Disabled by default, which also disables outgoing IPv6 support.
1275 .. _setting-reuseport:
1282 If ``SO_REUSEPORT`` support is available, allows multiple processes to open a listening socket on the same port.
1284 Since 4.1.0, when ``pdns-distributes-queries`` is set to false and ``reuseport`` is enabled, every thread will open a separate listening socket to let the kernel distribute the incoming queries, avoiding any thundering herd issue as well as the distributor thread being a bottleneck, thus leading to much higher performance on multi-core boxes.
1294 Specify which random number generator to use. Permissible choises are
1295 - auto - choose automatically
1296 - sodium - Use libsodium ``randombytes_uniform``
1297 - openssl - Use libcrypto ``RAND_bytes``
1298 - getrandom - Use libc getrandom, falls back to urandom if it does not really work
1299 - arc4random - Use BSD ``arc4random_uniform``
1300 - urandom - Use ``/dev/urandom``
1301 - kiss - Use simple settable deterministic RNG. **FOR TESTING PURPOSES ONLY!**
1304 Not all choises are available on all systems.
1306 .. _setting-root-nx-trust:
1313 If set, an NXDOMAIN from the root-servers will serve as a blanket NXDOMAIN for the entire TLD the query belonged to.
1314 The effect of this is far fewer queries to the root-servers.
1316 .. versionchanged:: 4.0.0
1318 Default is 'yes' now, was 'no' before 4.0.0
1320 .. _setting-security-poll-suffix:
1322 ``security-poll-suffix``
1323 ------------------------
1325 - Default: secpoll.powerdns.com.
1327 Domain name from which to query security update notifications.
1328 Setting this to an empty string disables secpoll.
1330 .. _setting-serve-rfc1918:
1337 This makes the server authoritatively aware of: ``10.in-addr.arpa``, ``168.192.in-addr.arpa``, ``16-31.172.in-addr.arpa``, which saves load on the AS112 servers.
1338 Individual parts of these zones can still be loaded or forwarded.
1340 .. _setting-server-down-max-fails:
1342 ``server-down-max-fails``
1343 -------------------------
1347 If a server has not responded in any way this many times in a row, no longer send it any queries for `server-down-throttle-time`_ seconds.
1348 Afterwards, we will try a new packet, and if that also gets no response at all, we again throttle for `server-down-throttle-time`_ seconds.
1349 Even a single response packet will drop the block.
1351 .. _setting-server-down-throttle-time:
1353 ``server-down-throttle-time``
1354 -----------------------------
1358 Throttle a server that has failed to respond `server-down-max-fails`_ times for this many seconds.
1360 .. _setting-server-id:
1365 - Default: The hostname of the server
1367 The reply given by The PowerDNS recursor to a query for 'id.server' with its hostname, useful for in clusters.
1368 When a query contains the :rfc:`NSID EDNS0 Option <5001>`, this value is returned in the response as the NSID value.
1370 This setting can be used to override the answer given to these queries.
1371 Set to "disabled" to disable NSID and 'id.server' answers.
1373 Query example (where 192.0.2.14 is your server):
1377 dig @192.0.2.14 CHAOS TXT id.server.
1378 dig @192.0.2.14 example.com IN A +nsid
1380 ``setgid``, ``setuid``
1381 ----------------------
1385 PowerDNS can change its user and group id after binding to its socket.
1386 Can be used for better :doc:`security <security>`.
1388 .. _setting-signature-inception-skew:
1390 ``signature-inception-skew``
1391 ----------------------------------
1392 .. versionadded:: 4.1.5
1397 Allow the signature inception to be off by this number of seconds. Negative values are not allowed.
1399 .. versionchanged:: 4.2.0
1401 Default is now 60, was 0 before.
1403 .. _setting-single-socket:
1410 Use only a single socket for outgoing queries.
1412 .. _setting-snmp-agent:
1416 .. versionadded:: 4.1.0
1421 If set to true and PowerDNS has been compiled with SNMP support, it will register as an SNMP agent to provide statistics and be able to send traps.
1423 .. _setting-snmp-master-socket:
1425 ``snmp-master-socket``
1426 ----------------------
1427 .. versionadded:: 4.1.0
1432 If not empty and ``snmp-agent`` is set to true, indicates how PowerDNS should contact the SNMP master to register as an SNMP agent.
1434 .. _setting-socket-dir:
1440 Where to store the control socket and pidfile.
1441 The default depends on ``LOCALSTATEDIR`` or the ``--with-socketdir`` setting when building (usually ``/var/run`` or ``/run``).
1443 When using `chroot`_ the default becomes to ``/``.
1445 ``socket-owner``, ``socket-group``, ``socket-mode``
1446 ---------------------------------------------------
1447 Owner, group and mode of the controlsocket.
1448 Owner and group can be specified by name, mode is in octal.
1450 .. _setting-spoof-nearmiss-max:
1452 ``spoof-nearmiss-max``
1453 ----------------------
1457 If set to non-zero, PowerDNS will assume it is being spoofed after seeing this many answers with the wrong id.
1459 .. _setting-stack-size:
1466 Size of the stack per thread.
1468 .. _setting-statistics-interval:
1470 ``statistics-interval``
1471 -----------------------
1472 .. versionadded:: 4.1.0
1477 Interval between logging statistical summary on recursor performance.
1480 .. _setting-stats-api-blacklist:
1482 ``stats-api-blacklist``
1483 -----------------------
1484 .. versionadded:: 4.2.0
1487 - Default: "cache-bytes, packetcache-bytes, special-memory-usage, ecs-v4-response-bits-*, ecs-v6-response-bits-*"
1489 A list of comma-separated statistic names, that are disabled when retrieving the complete list of statistics via the API for performance reasons.
1490 These statistics can still be retrieved individually by specifically asking for it.
1492 .. _setting-stats-carbon-blacklist:
1494 ``stats-carbon-blacklist``
1495 --------------------------
1496 .. versionadded:: 4.2.0
1499 - Default: "cache-bytes, packetcache-bytes, special-memory-usage, ecs-v4-response-bits-*, ecs-v6-response-bits-*"
1501 A list of comma-separated statistic names, that are prevented from being exported via carbon for performance reasons.
1503 .. _setting-stats-rec-control-blacklist:
1505 ``stats-rec-control-blacklist``
1506 -------------------------------
1507 .. versionadded:: 4.2.0
1510 - Default: "cache-bytes, packetcache-bytes, special-memory-usage, ecs-v4-response-bits-*, ecs-v6-response-bits-*"
1512 A list of comma-separated statistic names, that are disabled when retrieving the complete list of statistics via `rec_control get-all`, for performance reasons.
1513 These statistics can still be retrieved individually.
1515 .. _setting-stats-ringbuffer-entries:
1517 ``stats-ringbuffer-entries``
1518 ----------------------------
1522 Number of entries in the remotes ringbuffer, which keeps statistics on who is querying your server.
1523 Can be read out using ``rec_control top-remotes``.
1525 .. _setting-stats-snmp-blacklist:
1527 ``stats-snmp-blacklist``
1528 ------------------------
1529 .. versionadded:: 4.2.0
1532 - Default: "cache-bytes, packetcache-bytes, special-memory-usage, ecs-v4-response-bits-*, ecs-v6-response-bits-*"
1534 A list of comma-separated statistic names, that are prevented from being exported via SNMP, for performance reasons.
1536 .. _setting-tcp-fast-open:
1540 .. versionadded:: 4.1.0
1543 - Default: 0 (Disabled)
1545 Enable TCP Fast Open support, if available, on the listening sockets.
1546 The numerical value supplied is used as the queue size, 0 meaning disabled.
1548 .. _setting-threads:
1555 Spawn this number of threads on startup.
1564 If turned on, output impressive heaps of logging.
1565 May destroy performance under load.
1567 .. _setting-udp-source-port-min:
1569 ``udp-source-port-min``
1570 -----------------------
1571 .. versionadded:: 4.2.0
1576 This option sets the low limit of UDP port number to bind on.
1578 In combination with `udp-source-port-max`_ it configures the UDP
1579 port range to use. Port numbers are randomized within this range on
1580 initialization, and exceptions can be configured with `udp-source-port-avoid`_
1582 .. _setting-udp-source-port-max:
1584 ``udp-source-port-max``
1585 -----------------------
1586 .. versionadded:: 4.2.0
1591 This option sets the maximum limit of UDP port number to bind on.
1593 See `udp-source-port-min`_.
1595 .. _setting-udp-source-port-avoid:
1597 ``udp-source-port-avoid``
1598 -------------------------
1599 .. versionadded:: 4.2.0
1604 A list of comma-separated UDP port numbers to avoid when binding.
1607 See `udp-source-port-min`_.
1609 .. _setting-udp-truncation-threshold:
1611 ``udp-truncation-threshold``
1612 ----------------------------
1613 .. versionchanged:: 4.2.0
1614 Before 4.2.0, the default was 1680
1619 EDNS0 allows for large UDP response datagrams, which can potentially raise performance.
1620 Large responses however also have downsides in terms of reflection attacks.
1621 This setting limits the accepted size.
1622 Maximum value is 65535, but values above 4096 should probably not be attempted.
1624 To know why 1232, see the note at :ref:`setting-edns-outgoing-bufsize`.
1626 .. _setting-unique-response-tracking:
1628 ``unique-response-tracking``
1629 ----------------------------
1630 .. versionadded:: 4.2.0
1633 - Default: no (disabled)
1635 Whether to track unique DNS responses, i.e. never seen before combinations
1636 of the triplet (query name, query type, RR[rrname, rrtype, rrdata]).
1637 This can be useful for tracking potentially suspicious domains and
1638 behaviour, e.g. DNS fast-flux.
1639 If protobuf is enabled and configured, then the Protobuf Response message
1640 will contain a flag with udr set to true for each RR that is considered
1641 unique, i.e. never seen before.
1642 This feature uses a probabilistic data structure (stable bloom filter) to
1643 track unique responses, which can have false positives as well as false
1644 negatives, thus it is a best-effort feature. Increasing the number of cells
1645 in the SBF using the unique-response-db-size setting can reduce FPs and FNs.
1647 .. _setting-unique-response-log:
1649 ``unique-response-log``
1650 -----------------------
1651 .. versionadded:: 4.2.0
1654 - Default: no (disabled)
1656 Whether to log when a unique response is detected. The log line
1657 looks something like:
1659 Oct 24 12:11:27 Unique response observed: qname=foo.com qtype=A rrtype=AAAA rrname=foo.com rrcontent=1.2.3.4
1661 .. _setting-unique-response-db-size:
1663 ``unique-response-db-size``
1664 ---------------------------
1665 .. versionadded:: 4.2.0
1670 The default size of the stable bloom filter used to store previously
1671 observed responses is 67108864. To change the number of cells, use this
1672 setting. For each cell, the SBF uses 1 bit of memory, and one byte of
1673 disk for the persistent file.
1674 If there are already persistent files saved to disk, this setting will
1675 have no effect unless you remove the existing files.
1677 .. _setting-unique-response-history-dir:
1679 ``unique-response-history-dir``
1680 -------------------------------
1681 .. versionadded:: 4.2.0
1685 This setting controls which directory is used to store the on-disk
1686 cache of previously observed responses.
1688 The default depends on ``LOCALSTATEDIR`` when building the software.
1689 Usually this comes down to ``/var/lib/pdns-recursor/udr`` or ``/usr/local/var/lib/pdns-recursor/udr``).
1691 The newly observed domain feature uses a stable bloom filter to store
1692 a history of previously observed responses. The data structure is
1693 synchronized to disk every 10 minutes, and is also initialized from
1694 disk on startup. This ensures that previously observed responses are
1695 preserved across recursor restarts. If you change the
1696 unique-response-db-size, you must remove any files from this directory.
1698 .. _setting-unique-response-pb-tag:
1700 ``unique-response-pb-tag``
1701 --------------------------
1702 .. versionadded:: 4.2.0
1707 If protobuf is configured, then this tag will be added to all protobuf response messages when
1708 a unique DNS response is observed.
1710 .. _setting-use-incoming-edns-subnet:
1712 ``use-incoming-edns-subnet``
1713 ----------------------------
1717 Whether to process and pass along a received EDNS Client Subnet to authoritative servers.
1718 The ECS information will only be sent for netmasks and domains listed in `edns-subnet-whitelist`_ and will be truncated if the received scope exceeds `ecs-ipv4-bits`_ for IPv4 or `ecs-ipv6-bits`_ for IPv6.
1720 .. _setting-version:
1724 Print version of this binary. Useful for checking which version of the PowerDNS recursor is installed on a system.
1726 .. _setting-version-string:
1731 - Default: PowerDNS Recursor version number
1733 By default, PowerDNS replies to the 'version.bind' query with its version number.
1734 Security conscious users may wish to override the reply PowerDNS issues.
1736 .. _setting-webserver:
1743 Start the webserver (for REST API).
1745 .. _setting-webserver-address:
1747 ``webserver-address``
1748 ---------------------
1750 - Default: 127.0.0.1
1752 IP address for the webserver to listen on.
1754 .. _setting-webserver-allow-from:
1756 ``webserver-allow-from``
1757 ------------------------
1758 - IP addresses, comma separated
1759 - Default: 127.0.0.1,::1
1761 .. versionchanged:: 4.1.0
1763 Default is now 127.0.0.1,::1, was 0.0.0.0,::/0 before.
1765 These subnets are allowed to access the webserver.
1767 .. _setting-webserver-loglevel:
1769 ``webserver-loglevel``
1770 ----------------------
1771 .. versionadded:: 4.2.0
1773 - String, one of "none", "normal", "detailed"
1775 The amount of logging the webserver must do. "none" means no useful webserver information will be logged.
1776 When set to "normal", the webserver will log a line per request that should be familiar::
1778 [webserver] e235780e-a5cf-415e-9326-9d33383e739e 127.0.0.1:55376 "GET /api/v1/servers/localhost/bla HTTP/1.1" 404 196
1780 When set to "detailed", all information about the request and response are logged::
1782 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Request Details:
1783 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Headers:
1784 [webserver] e235780e-a5cf-415e-9326-9d33383e739e accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
1785 [webserver] e235780e-a5cf-415e-9326-9d33383e739e accept-encoding: gzip, deflate
1786 [webserver] e235780e-a5cf-415e-9326-9d33383e739e accept-language: en-US,en;q=0.5
1787 [webserver] e235780e-a5cf-415e-9326-9d33383e739e connection: keep-alive
1788 [webserver] e235780e-a5cf-415e-9326-9d33383e739e dnt: 1
1789 [webserver] e235780e-a5cf-415e-9326-9d33383e739e host: 127.0.0.1:8081
1790 [webserver] e235780e-a5cf-415e-9326-9d33383e739e upgrade-insecure-requests: 1
1791 [webserver] e235780e-a5cf-415e-9326-9d33383e739e user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0
1792 [webserver] e235780e-a5cf-415e-9326-9d33383e739e No body
1793 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Response details:
1794 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Headers:
1795 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Connection: close
1796 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Content-Length: 49
1797 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Content-Type: text/html; charset=utf-8
1798 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Server: PowerDNS/0.0.15896.0.gaba8bab3ab
1799 [webserver] e235780e-a5cf-415e-9326-9d33383e739e Full body:
1800 [webserver] e235780e-a5cf-415e-9326-9d33383e739e <!html><title>Not Found</title><h1>Not Found</h1>
1801 [webserver] e235780e-a5cf-415e-9326-9d33383e739e 127.0.0.1:55376 "GET /api/v1/servers/localhost/bla HTTP/1.1" 404 196
1803 The value between the hooks is a UUID that is generated for each request. This can be used to find all lines related to a single request.
1806 The webserver logs these line on the NOTICE level. The :ref:`settings-loglevel` seting must be 5 or higher for these lines to end up in the log.
1808 .. _setting-webserver-password:
1810 ``webserver-password``
1811 ----------------------
1815 Password required to access the webserver.
1817 .. _setting-webserver-port:
1824 TCP port where the webserver should listen on.
1826 .. _setting-write-pid:
1833 If a PID file should be written to `socket-dir`_
1835 .. _setting-xpf-allow-from:
1839 .. versionadded:: 4.2.0
1841 - IP ranges, separated by commas
1845 This is an experimental implementation of `draft-bellis-dnsop-xpf <https://datatracker.ietf.org/doc/draft-bellis-dnsop-xpf/>`_.
1847 The server will trust XPF records found in queries sent from those netmasks (both IPv4 and IPv6),
1848 and will adjust queries' source and destination accordingly. This is especially useful when the recursor
1849 is placed behind a proxy like `dnsdist <https://dnsdist.org>`_.
1850 Note that the :ref:`setting-allow-from` setting is still applied to the original source address, and thus access restriction
1851 should be done on the proxy.
1853 .. _setting-xpf-rr-code:
1857 .. versionadded:: 4.2.0
1863 This is an experimental implementation of `draft-bellis-dnsop-xpf <https://datatracker.ietf.org/doc/draft-bellis-dnsop-xpf/>`_.
1865 This option sets the resource record code to use for XPF records, as long as an official code has not been assigned to it.
1866 0 means that XPF is disabled.
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