unbound/doc/example.conf

#
# Example configuration file.
#
# See unbound.conf(5) man page.
#
# this is a comment.

#Use this to include other text into the file.
#include: "otherfile.conf"

# The server clause sets the main parameters. 
server:
	# whitespace is not necessary, but looks cleaner.

	# verbosity number, 0 is least verbose. 1 is default.
	verbosity: 1

	# print statistics to the log (for every thread) every N seconds.
	# Set to "" or 0 to disable. Default is disabled.
	# statistics-interval: 0
	
	# enable cumulative statistics, without clearing them after printing.
	# statistics-cumulative: no

	# number of threads to create. 1 disables threading.
	# num-threads: 1

	# specify the interfaces to answer queries from by ip-address.
	# The default is to listen to localhost (127.0.0.1 and ::1).
	# specify 0.0.0.0 and ::0 to bind to all available interfaces.
	# specify every interface on a new 'interface:' labelled line.
	# The listen interfaces are not changed on reload, only on restart.
	# interface: 192.0.2.153
	# interface: 192.0.2.154
	# interface: 2001:DB8::5
	
	# enable this feature to copy the source address of queries to reply.
	# Socket options not be supported on all platforms. experimental. 
	# interface-automatic: no

	# port to answer queries from
	# port: 53

	# specify the interfaces to send outgoing queries to authoritative
	# server from by ip-address. If none, the default (all) interface
	# is used. Specify every interface on a 'outgoing-interface:' line.
	# outgoing-interface: 192.0.2.153
	# outgoing-interface: 2001:DB8::5
	# outgoing-interface: 2001:DB8::6

	# unbound needs to send packets to authoritative nameservers.
	# it uses a range of ports for that.
	# the start number of the port range
	# outgoing-port: 1053

	# number of port to allocate per thread, determines the size of the
	# port range. A larger port range gives more resistance to certain
	# spoof attacks, as it gets harder to guess which port is used. 
	# But also takes more system resources (for open sockets).
	# outgoing-range: 256

	# number of outgoing simultaneous tcp buffers to hold per thread.
	# outgoing-num-tcp: 10

	# number of incoming simultaneous tcp buffers to hold per thread.
	# incoming-num-tcp: 10
	
	# buffer size for handling DNS data. No messages larger than this
	# size can be sent or received, by UDP or TCP. In bytes.
	# msg-buffer-size: 65552

	# the amount of memory to use for the message cache.
	# plain value in bytes or you can append k, m or G. default is "4Mb". 
	# msg-cache-size: 4m

	# the number of slabs to use for the message cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	# msg-cache-slabs: 4

	# the number of queries that a thread gets to service.
	# num-queries-per-thread: 1024

	# the amount of memory to use for the RRset cache.
	# plain value in bytes or you can append k, m or G. default is "4Mb". 
	# rrset-cache-size: 4m

	# the number of slabs to use for the RRset cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	# rrset-cache-slabs: 4
	
	# the time to live (TTL) value cap for RRsets and messages in the
	# cache. Items are not cached for longer. In seconds.
	# cache-max-ttl: 86400

	# the time to live (TTL) value for cached roundtrip times and
	# EDNS version information for hosts. In seconds.
	# infra-host-ttl: 900

	# the time to live (TTL) value for cached lame delegations. In sec.
	# infra-lame-ttl: 900

	# the number of slabs to use for the Infrastructure cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	# infra-cache-slabs: 4

	# the maximum number of hosts that are cached (roundtrip times, EDNS).
	# infra-cache-numhosts: 10000

	# the maximum size of the lame zones cached per host. in bytes.
	# infra-cache-lame-size: 10k

	# Enable IPv4, "yes" or "no".
	# do-ip4: yes

	# Enable IPv6, "yes" or "no".
	# do-ip6: yes

	# Enable UDP, "yes" or "no".
	# do-udp: yes

	# Enable TCP, "yes" or "no".
	# do-tcp: yes

	# Detach from the terminal, run in background, "yes" or "no".
	# do-daemonize: yes

	# control which clients are allowed to make (recursive) queries
	# to this server. Specify classless netblocks with /size and action.
	# By default everything is refused, except for localhost.
	# Choose deny (drop message), refuse (polite error reply), allow.
	# access-control: 0.0.0.0/0 refuse
	# access-control: 127.0.0.0/8 allow
	# access-control: ::0/0 refuse
	# access-control: ::1 allow
	# access-control: ::ffff:127.0.0.1 allow
	
	# if given, a chroot(2) is done to the given directory.
	# i.e. you can chroot to the working directory, for example,
	# for extra security, but make sure all files are in that directory.
	# If you give "" no chroot is performed.
	# chroot: "/etc/unbound"

	# if given, user privileges are dropped (after binding port),
	# and the given username is assumed. Default is user "unbound".
	# If you give "" no privileges are dropped.
	# username: "unbound"

	# the working directory.
	# directory: "/etc/unbound"

	# the log file, "" means log to stderr. 
	# Use of this option sets use-syslog to "no".
	# logfile: ""
	
	# Log to syslog(3) if yes. The log facility LOG_DAEMON is used to 
	# log to, with identity "unbound". If yes, it overrides the logfile.
	# use-syslog: yes 

	# the pid file.
	# pidfile: "/etc/unbound/unbound.pid"
	
	# file to read root hints from.
	# get one from ftp://FTP.INTERNIC.NET/domain/named.cache
	# root-hints: ""
	
	# enable to not answer id.server and hostname.bind queries.
	# hide-identity: no
	
	# enable to not answer version.server and version.bind queries.
	# hide-version: no
	
	# the identity to report. Leave "" or default to return hostname.
	# identity: ""
	
	# the version to report. Leave "" or default to return package version.
	# version: ""
	
	# the target fetch policy.
	# series of integers describing the policy per dependency depth. 
	# The number of values in the list determines the maximum dependency 
	# depth the recursor will pursue before giving up. Each integer means:
	# 	-1 : fetch all targets opportunistically,
	# 	0: fetch on demand,
	#	positive value: fetch that many targets opportunistically.
	# Enclose the list of numbers between quotes ("").
	# target-fetch-policy: "3 2 1 0 0"
	
	# Harden against very small EDNS buffer sizes. 
	# harden-short-bufsize: no
	
	# Harden against unseemly large queries.
	# harden-large-queries: no
	
	# Harden against out of zone rrsets, to avoid spoofing attempts. 
	# harden-glue: yes
	
	# Harden against receiving dnssec-stripped data. If you turn it
	# off, failing to validate dnskey data for a trustanchor will 
	# trigger insecure mode for that zone (like without a trustanchor).
	# Default on, which insists on dnssec data for trust-anchored zones.
	# harden-dnssec-stripped: yes
	
	# Use 0x20-encoded random bits in the query to foil spoof attempts.
	# Disabled by default, because some caching forwarders may not
	# support this (if you have forward-zones). Most authority servers do.
	# This feature is an experimental implementation of draft dns-0x20.
	# use-caps-for-id: no
	
	# Do not query the following addresses. No DNS queries are sent there.
	# List one address per entry. List classless netblocks with /size,
	# do-not-query-address: 127.0.0.1/8
	# do-not-query-address: ::1
	
	# if yes, the above default do-not-query-address entries are present.
	# if no, localhost can be queried (for testing and debugging).
	# do-not-query-localhost: yes
	
	# module configuration of the server. A string with identifiers
	# separated by spaces. "iterator" or "validator iterator"
	# module-config: "validator iterator"
	
	# File with trusted keys for validation. Specify more than one file
	# with several entries, one file per entry.
	# Zone file format, with DS and DNSKEY entries.
	# trust-anchor-file: ""
	
	# Trusted key for validation. DS or DNSKEY. specify the RR on a
	# single line, surrounded by "". TTL is ignored. class is IN default.
	# (These examples are from August 2007 and may not be valid anymore).
	# trust-anchor: "nlnetlabs.nl. DNSKEY 257 3 5 AQPzzTWMz8qSWIQlfRnPckx2BiVmkVN6LPupO3mbz7FhLSnm26n6iG9N Lby97Ji453aWZY3M5/xJBSOS2vWtco2t8C0+xeO1bc/d6ZTy32DHchpW 6rDH1vp86Ll+ha0tmwyy9QP7y2bVw5zSbFCrefk8qCUBgfHm9bHzMG1U BYtEIQ=="
	# trust-anchor: "jelte.nlnetlabs.nl. DS 42860 5 1 14D739EB566D2B1A5E216A0BA4D17FA9B038BE4A"

	# File with trusted keys for validation. Specify more than one file
	# with several entries, one file per entry. Like trust-anchor-file
	# but has a different file format. Format is BIND-9 style format, 
	# the trusted-keys { name flag proto algo "key"; }; clauses are read.
	# trusted-keys-file: ""

	# Override the date for validation with a specific fixed date.
	# Do not set this unless you are debugging signature inception
	# and expiration. "" or "0" turns the feature off. 
	# val-override-date: ""
	
	# The time to live for bogus data, rrsets and messages. This avoids
	# some of the revalidation, until the time interval expires. in secs.
	# val-bogus-ttl: 900
	
	# Should additional section of secure message also be kept clean of
	# unsecure data. Useful to shield the users of this validator from
	# potential bogus data in the additional section. All unsigned data 
	# in the additional section is removed from secure messages.
	# val-clean-additional: yes
	
	# Turn permissive mode on to permit bogus messages. Thus, messages
	# for which security checks failed will be returned to clients,
	# instead of SERVFAIL. It still performs the security checks, which
	# result in interesting log files and possibly the AD bit in
	# replies if the message is found secure. The default is off.
	# val-permissive-mode: no
	
	# It is possible to configure NSEC3 maximum iteration counts per
	# keysize. Keep this table very short, as linear search is done.
	# A message with an NSEC3 with larger count is marked insecure.
	# List in ascending order the keysize and count values.
	# val-nsec3-keysize-iterations: "1024 150 2048 500 4096 2500"

	# the amount of memory to use for the key cache.
	# plain value in bytes or you can append k, m or G. default is "4Mb". 
	# key-cache-size: 4m

	# the number of slabs to use for the key cache.
	# the number of slabs must be a power of 2.
	# more slabs reduce lock contention, but fragment memory usage.
	# key-cache-slabs: 4

	# a number of locally served zones can be configured.
	# 	local-zone: <zone> <type>
	# 	local-data: "<resource record string>"
	# o deny serves local data (if any), else, drops queries. 
	# o refuse serves local data (if any), else, replies with error.
	# o static serves local data, else, nxdomain or nodata answer.
	# o transparent serves local data, else, resolves normally .
	# o redirect serves the zone data for any subdomain in the zone.
	# o nodefault can be used to normally resolve AS112 zones.
	#
	# defaults are localhost address, reverse for 127.0.0.1 and ::1
	# and nxdomain for AS112 zones. If you configure one of these zones
	# the default content is omitted, or you can omit it with 'nodefault'.
	# 
	# If you configure local-data without specifying local-zone, by
	# default a transparent local-zone is created for the data.
	#
	# You can add locally served data with
	# local-zone: "local." static
	# local-data: "mycomputer.local. IN A 192.0.2.51"
	# local-data: 'mytext.local TXT "content of text record"'
	#
	# You can override certain queries with
	# local-data: "adserver.example.com A 127.0.0.1"
	#
	# You can redirect a domain to a fixed address with
	# (this makes example.com, www.example.com, etc, all go to 192.0.2.3)
	# local-zone: "example.com" redirect
	# local-data: "example.com A 192.0.2.3"


# Stub zones.
# Create entries like below, to make all queries for 'example.com' and 
# 'example.org' go to the given list of nameservers. list zero or more 
# nameservers by hostname or by ipaddress.
# stub-zone:
#	name: "example.com"
#	stub-addr: 192.0.2.68
# stub-zone:
#	name: "example.org"
#	stub-host: ns.example.com.

# Forward zones
# Create entries like below, to make all queries for 'example.com' and
# 'example.org' go to the given list of servers. These servers have to handle
# recursion to other nameservers. List zero or more nameservers by hostname
# or by ipaddress. Use an entry with name "." to forward all queries.
# forward-zone:
# 	name: "example.com"
# 	forward-addr: 192.0.2.68
# 	forward-addr: 192.0.2.73@5355  # forward to port 5355.
# forward-zone:
# 	name: "example.org"
# 	forward-host: fwd.example.com