/etc/powerdns/pdns.conf is in pdns-server 4.1.1-1.
This file is owned by root:root, with mode 0o600.
The actual contents of the file can be viewed below.
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#################################
# 8bit-dns Allow 8bit dns queries
#
# 8bit-dns=no
#################################
# allow-axfr-ips Allow zonetransfers only to these subnets
#
# allow-axfr-ips=127.0.0.0/8,::1
#################################
# allow-dnsupdate-from A global setting to allow DNS updates from these IP ranges.
#
# allow-dnsupdate-from=127.0.0.0/8,::1
#################################
# allow-notify-from Allow AXFR NOTIFY from these IP ranges. If empty, drop all incoming notifies.
#
# allow-notify-from=0.0.0.0/0,::/0
#################################
# allow-unsigned-notify Allow unsigned notifications for TSIG secured domains
#
# allow-unsigned-notify=yes
#################################
# allow-unsigned-supermaster Allow supermasters to create zones without TSIG signed NOTIFY
#
# allow-unsigned-supermaster=yes
#################################
# also-notify When notifying a domain, also notify these nameservers
#
# also-notify=
#################################
# any-to-tcp Answer ANY queries with tc=1, shunting to TCP
#
# any-to-tcp=yes
#################################
# api Enable/disable the REST API (including HTTP listener)
#
# api=no
#################################
# api-key Static pre-shared authentication key for access to the REST API
#
# api-key=
#################################
# api-logfile Location of the server logfile (used by the REST API)
#
# api-logfile=/var/log/pdns.log
#################################
# api-readonly Disallow data modification through the REST API when set
#
# api-readonly=no
#################################
# axfr-lower-serial Also AXFR a zone from a master with a lower serial
#
# axfr-lower-serial=no
#################################
# cache-ttl Seconds to store packets in the PacketCache
#
# cache-ttl=20
#################################
# carbon-interval Number of seconds between carbon (graphite) updates
#
# carbon-interval=30
#################################
# carbon-ourname If set, overrides our reported hostname for carbon stats
#
# carbon-ourname=
#################################
# carbon-server If set, send metrics in carbon (graphite) format to this server IP address
#
# carbon-server=
#################################
# chroot If set, chroot to this directory for more security
#
# chroot=
#################################
# config-dir Location of configuration directory (pdns.conf)
#
# config-dir=/etc/powerdns
#################################
# config-name Name of this virtual configuration - will rename the binary image
#
# config-name=
#################################
# control-console Debugging switch - don't use
#
# control-console=no
#################################
# daemon Operate as a daemon
#
# daemon=no
#################################
# default-ksk-algorithm Default KSK algorithm
#
# default-ksk-algorithm=ecdsa256
#################################
# default-ksk-size Default KSK size (0 means default)
#
# default-ksk-size=0
#################################
# default-soa-edit Default SOA-EDIT value
#
# default-soa-edit=
#################################
# default-soa-edit-signed Default SOA-EDIT value for signed zones
#
# default-soa-edit-signed=
#################################
# default-soa-mail mail address to insert in the SOA record if none set in the backend
#
# default-soa-mail=
#################################
# default-soa-name name to insert in the SOA record if none set in the backend
#
# default-soa-name=a.misconfigured.powerdns.server
#################################
# default-ttl Seconds a result is valid if not set otherwise
#
# default-ttl=3600
#################################
# default-zsk-algorithm Default ZSK algorithm
#
# default-zsk-algorithm=
#################################
# default-zsk-size Default ZSK size (0 means default)
#
# default-zsk-size=0
#################################
# direct-dnskey Fetch DNSKEY RRs from backend during DNSKEY synthesis
#
# direct-dnskey=no
#################################
# disable-axfr Disable zonetransfers but do allow TCP queries
#
# disable-axfr=no
#################################
# disable-axfr-rectify Disable the rectify step during an outgoing AXFR. Only required for regression testing.
#
# disable-axfr-rectify=no
#################################
# disable-syslog Disable logging to syslog, useful when running inside a supervisor that logs stdout
#
# disable-syslog=no
#################################
# disable-tcp Do not listen to TCP queries
#
# disable-tcp=no
#################################
# distributor-threads Default number of Distributor (backend) threads to start
#
# distributor-threads=3
#################################
# dname-processing If we should support DNAME records
#
# dname-processing=no
#################################
# dnssec-key-cache-ttl Seconds to cache DNSSEC keys from the database
#
# dnssec-key-cache-ttl=30
#################################
# dnsupdate Enable/Disable DNS update (RFC2136) support. Default is no.
#
# dnsupdate=no
#################################
# do-ipv6-additional-processing Do AAAA additional processing
#
# do-ipv6-additional-processing=yes
#################################
# domain-metadata-cache-ttl Seconds to cache domain metadata from the database
#
# domain-metadata-cache-ttl=60
#################################
# edns-subnet-processing If we should act on EDNS Subnet options
#
# edns-subnet-processing=no
#################################
# entropy-source If set, read entropy from this file
#
# entropy-source=/dev/urandom
#################################
# expand-alias Expand ALIAS records
#
# expand-alias=no
#################################
# forward-dnsupdate A global setting to allow DNS update packages that are for a Slave domain, to be forwarded to the master.
#
# forward-dnsupdate=yes
#################################
# forward-notify IP addresses to forward received notifications to regardless of master or slave settings
#
# forward-notify=
#################################
# guardian Run within a guardian process
#
# guardian=no
#################################
# include-dir Include *.conf files from this directory
#
# include-dir=
include-dir=/etc/powerdns/pdns.d
#################################
# launch Which backends to launch and order to query them in
#
# launch=
launch=
#################################
# load-modules Load this module - supply absolute or relative path
#
# load-modules=
#################################
# local-address Local IP addresses to which we bind
#
# local-address=0.0.0.0
#################################
# local-address-nonexist-fail Fail to start if one or more of the local-address's do not exist on this server
#
# local-address-nonexist-fail=yes
#################################
# local-ipv6 Local IP address to which we bind
#
# local-ipv6=::
#################################
# local-ipv6-nonexist-fail Fail to start if one or more of the local-ipv6 addresses do not exist on this server
#
# local-ipv6-nonexist-fail=yes
#################################
# local-port The port on which we listen
#
# local-port=53
#################################
# log-dns-details If PDNS should log DNS non-erroneous details
#
# log-dns-details=no
#################################
# log-dns-queries If PDNS should log all incoming DNS queries
#
# log-dns-queries=no
#################################
# log-timestamp Print timestamps in log lines
#
# log-timestamp=yes
#################################
# logging-facility Log under a specific facility
#
# logging-facility=
#################################
# loglevel Amount of logging. Higher is more. Do not set below 3
#
# loglevel=4
#################################
# lua-axfr-script Script to be used to edit incoming AXFRs
#
# lua-axfr-script=
#################################
# lua-dnsupdate-policy-script Lua script with DNS update policy handler
#
# lua-dnsupdate-policy-script=
#################################
# lua-prequery-script Lua script with prequery handler (DO NOT USE)
#
# lua-prequery-script=
#################################
# master Act as a master
#
# master=no
#################################
# max-cache-entries Maximum number of entries in the query cache
#
# max-cache-entries=1000000
#################################
# max-ent-entries Maximum number of empty non-terminals in a zone
#
# max-ent-entries=100000
#################################
# max-nsec3-iterations Limit the number of NSEC3 hash iterations
#
# max-nsec3-iterations=500
#################################
# max-packet-cache-entries Maximum number of entries in the packet cache
#
# max-packet-cache-entries=1000000
#################################
# max-queue-length Maximum queuelength before considering situation lost
#
# max-queue-length=5000
#################################
# max-signature-cache-entries Maximum number of signatures cache entries
#
# max-signature-cache-entries=
#################################
# max-tcp-connections Maximum number of TCP connections
#
# max-tcp-connections=20
#################################
# max-tcp-connections-per-client Maximum number of simultaneous TCP connections per client
#
# max-tcp-connections-per-client=0
#################################
# module-dir Default directory for modules
#
#################################
# negquery-cache-ttl Seconds to store negative query results in the QueryCache
#
# negquery-cache-ttl=60
#################################
# no-shuffle Set this to prevent random shuffling of answers - for regression testing
#
# no-shuffle=off
#################################
# non-local-bind Enable binding to non-local addresses by using FREEBIND / BINDANY socket options
#
# non-local-bind=no
#################################
# only-notify Only send AXFR NOTIFY to these IP addresses or netmasks
#
# only-notify=0.0.0.0/0,::/0
#################################
# out-of-zone-additional-processing Do out of zone additional processing
#
# out-of-zone-additional-processing=yes
#################################
# outgoing-axfr-expand-alias Expand ALIAS records during outgoing AXFR
#
# outgoing-axfr-expand-alias=no
#################################
# overload-queue-length Maximum queuelength moving to packetcache only
#
# overload-queue-length=0
#################################
# prevent-self-notification Don't send notifications to what we think is ourself
#
# prevent-self-notification=yes
#################################
# query-cache-ttl Seconds to store query results in the QueryCache
#
# query-cache-ttl=20
#################################
# query-local-address Source IP address for sending queries
#
# query-local-address=0.0.0.0
#################################
# query-local-address6 Source IPv6 address for sending queries
#
# query-local-address6=::
#################################
# query-logging Hint backends that queries should be logged
#
# query-logging=no
#################################
# queue-limit Maximum number of milliseconds to queue a query
#
# queue-limit=1500
#################################
# receiver-threads Default number of receiver threads to start
#
# receiver-threads=1
#################################
# resolver Use this resolver for ALIAS and the internal stub resolver
#
# resolver=no
#################################
# retrieval-threads Number of AXFR-retrieval threads for slave operation
#
# retrieval-threads=2
#################################
# reuseport Enable higher performance on compliant kernels by using SO_REUSEPORT allowing each receiver thread to open its own socket
#
# reuseport=no
#################################
# security-poll-suffix Domain name from which to query security update notifications
#
# security-poll-suffix=secpoll.powerdns.com.
security-poll-suffix=
#################################
# server-id Returned when queried for 'id.server' TXT or NSID, defaults to hostname - disabled or custom
#
# server-id=
#################################
# setgid If set, change group id to this gid for more security
#
setgid=pdns
#################################
# setuid If set, change user id to this uid for more security
#
setuid=pdns
#################################
# signing-threads Default number of signer threads to start
#
# signing-threads=3
#################################
# slave Act as a slave
#
# slave=no
#################################
# slave-cycle-interval Schedule slave freshness checks once every .. seconds
#
# slave-cycle-interval=60
#################################
# slave-renotify If we should send out notifications for slaved updates
#
# slave-renotify=no
#################################
# soa-expire-default Default SOA expire
#
# soa-expire-default=604800
#################################
# soa-minimum-ttl Default SOA minimum ttl
#
# soa-minimum-ttl=3600
#################################
# soa-refresh-default Default SOA refresh
#
# soa-refresh-default=10800
#################################
# soa-retry-default Default SOA retry
#
# soa-retry-default=3600
#################################
# socket-dir Where the controlsocket will live, /var/run when unset and not chrooted
#
# socket-dir=
#################################
# tcp-control-address If set, PowerDNS can be controlled over TCP on this address
#
# tcp-control-address=
#################################
# tcp-control-port If set, PowerDNS can be controlled over TCP on this address
#
# tcp-control-port=53000
#################################
# tcp-control-range If set, remote control of PowerDNS is possible over these networks only
#
# tcp-control-range=127.0.0.0/8, 10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, ::1/128, fe80::/10
#################################
# tcp-control-secret If set, PowerDNS can be controlled over TCP after passing this secret
#
# tcp-control-secret=
#################################
# tcp-fast-open Enable TCP Fast Open support on the listening sockets, using the supplied numerical value as the queue size
#
# tcp-fast-open=0
#################################
# traceback-handler Enable the traceback handler (Linux only)
#
# traceback-handler=yes
#################################
# trusted-notification-proxy IP address of incoming notification proxy
#
# trusted-notification-proxy=
#################################
# udp-truncation-threshold Maximum UDP response size before we truncate
#
# udp-truncation-threshold=1680
#################################
# version-string PowerDNS version in packets - full, anonymous, powerdns or custom
#
# version-string=full
#################################
# webserver Start a webserver for monitoring (api=yes also enables the HTTP listener)
#
# webserver=no
#################################
# webserver-address IP Address of webserver/API to listen on
#
# webserver-address=127.0.0.1
#################################
# webserver-allow-from Webserver/API access is only allowed from these subnets
#
# webserver-allow-from=127.0.0.1,::1
#################################
# webserver-password Password required for accessing the webserver
#
# webserver-password=
#################################
# webserver-port Port of webserver/API to listen on
#
# webserver-port=8081
#################################
# webserver-print-arguments If the webserver should print arguments
#
# webserver-print-arguments=no
#################################
# write-pid Write a PID file
#
# write-pid=yes
#################################
# xfr-max-received-mbytes Maximum number of megabytes received from an incoming XFR
#
# xfr-max-received-mbytes=100
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