Dockerfile

Dockerfile

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+FROM alpine:latest
+
+MAINTAINER Jochen Welzel
+
+RUN apk update && apk upgrade && apk add bash && apk add nsd
+RUN mkdir -p /var/db/nsd/zones/master && mkdir /var/db/nsd/zones/slave && mkdir /var/run/nsd
+COPY nsd.conf.example /tmp
+COPY entrypoint.sh /
+RUN chmod 755 /entrypoint.sh
+
+EXPOSE 53/TCP 53/UDP
+VOLUME ["/etc/nsd/", "/var/db/nsd"]
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

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+#!/usr/bin/env bash
+set -e
+
+if [ ! -f "/etc/nsd/nsd.conf" ]; then
+    cp /tmp/nsd.conf.example /etc/nsd/nsd.conf
+fi
+
+exec nsd -d
+

nsd.conf.example

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+#
+# nsd.conf -- the NSD(8) configuration file, nsd.conf(5).
+#
+# Copyright (c) 2001-2011, NLnet Labs. All rights reserved.
+#
+# See LICENSE for the license.
+#
+
+# This is a comment.
+# Sample configuration file
+# include: "file" # include that file's text over here.  Globbed, "*.conf"
+
+# options for the nsd server
+server:
+	# Number of NSD servers to fork.  Put the number of CPUs to use here.
+	# server-count: 1
+
+	# uncomment to specify specific interfaces to bind (default are the
+	# wildcard interfaces 0.0.0.0 and ::0).
+	# For servers with multiple IP addresses, list them one by one,
+	# or the source address of replies could be wrong.
+	# Use ip-transparent to be able to list addresses that turn on later.
+	# ip-address: 1.2.3.4
+	# ip-address: 1.2.3.4@5678
+	# ip-address: 12fe::8ef0
+
+	# Allow binding to non local addresses. Default no.
+	# ip-transparent: no
+
+	# Allow binding to addresses that are down.  Default no.
+	# ip-freebind: no
+
+	# use the reuseport socket option for performance. Default no.
+	# reuseport: no
+
+	# enable debug mode, does not fork daemon process into the background.
+	# debug-mode: no
+
+	# listen on IPv4 connections
+	# do-ip4: yes
+
+	# listen on IPv6 connections
+	# do-ip6: yes
+
+	# port to answer queries on. default is 53.
+	# port: 53
+
+	# Verbosity level.
+	# verbosity: 0
+
+	# After binding socket, drop user privileges.
+	# can be a username, id or id.gid.
+	# username: nsd
+
+	# Run NSD in a chroot-jail.
+	# make sure to have pidfile and database reachable from there.
+	# by default, no chroot-jail is used.
+	# chroot: "/etc/nsd"
+
+	# The directory for zonefile: files.  The daemon chdirs here.
+	# zonesdir: "/etc/nsd"
+	
+	# the list of dynamically added zones.
+	# zonelistfile: "/var/db/nsd/zone.list"
+
+	# the database to use
+	# if set to "" then no disk-database is used, less memory usage.
+	# database: "/var/db/nsd/nsd.db"
+
+	# log messages to file. Default to stderr and syslog (with
+	# facility LOG_DAEMON).  stderr disappears when daemon goes to bg.
+	# logfile: "/var/log/nsd.log"
+
+	# File to store pid for nsd in.
+	# pidfile: "/var/run/nsd/nsd.pid"
+
+	# The file where secondary zone refresh and expire timeouts are kept.
+	# If you delete this file, all secondary zones are forced to be 
+	# 'refreshing' (as if nsd got a notify).  Set to "" to disable.
+	# xfrdfile: "/var/db/nsd/xfrd.state"
+
+	# The directory where zone transfers are stored, in a subdir of it.
+	# xfrdir: "/var/db/nsd"
+
+	# don't answer VERSION.BIND and VERSION.SERVER CHAOS class queries
+	# hide-version: no
+
+	# version string the server responds with for chaos queries.
+	# default is 'NSD x.y.z' with the server's version number.
+	# version: "NSD"
+
+	# identify the server (CH TXT ID.SERVER entry).
+	# identity: "unidentified server"
+
+	# NSID identity (hex string, or "ascii_somestring"). default disabled.
+	# nsid: "aabbccdd"
+
+	# Maximum number of concurrent TCP connections per server.
+	# tcp-count: 100
+
+	# Maximum number of queries served on a single TCP connection.
+	# By default 0, which means no maximum.
+	# tcp-query-count: 0
+
+	# Override the default (120 seconds) TCP timeout.
+	# tcp-timeout: 120
+
+	# Maximum segment size (MSS) of TCP socket on which the server
+	# responds to queries. Default is 0, system default MSS.
+	# tcp-mss: 0
+
+	# Maximum segment size (MSS) of TCP socket for outgoing AXFR request.
+	# Default is 0, system default MSS.
+	# outgoing-tcp-mss: 0
+
+	# Preferred EDNS buffer size for IPv4.
+	# ipv4-edns-size: 4096
+
+	# Preferred EDNS buffer size for IPv6.
+	# ipv6-edns-size: 4096
+
+	# statistics are produced every number of seconds. Prints to log.
+	# Default is 0, meaning no statistics are produced.
+	# statistics: 3600
+
+	# Number of seconds between reloads triggered by xfrd.
+	# xfrd-reload-timeout: 1
+	
+	# log timestamp in ascii (y-m-d h:m:s.msec), yes is default.
+	# log-time-ascii: yes
+
+	# round robin rotation of records in the answer.
+	# round-robin: no
+
+	# check mtime of all zone files on start and sighup
+	# zonefiles-check: yes
+	
+	# write changed zonefiles to disk, every N seconds.
+	# default is 0(disabled) or 3600(if database is "").
+	# zonefiles-write: 3600
+
+
+# Remote control config section. 
+remote-control:
+	# Enable remote control with nsd-control(8) here.
+	# set up the keys and certificates with nsd-control-setup.
+	# control-enable: no
+
+	# what interfaces are listened to for control, default is on localhost.
+	# control-interface: 127.0.0.1
+	# control-interface: ::1
+
+	# port number for remote control operations (uses TLS over TCP).
+	# control-port: 8952
+
+	# nsd server key file for remote control.
+	# server-key-file: "/etc/nsd/nsd_server.key"
+
+	# nsd server certificate file for remote control.
+	# server-cert-file: "/etc/nsd/nsd_server.pem"
+
+	# nsd-control key file.
+	# control-key-file: "/etc/nsd/nsd_control.key"
+
+	# nsd-control certificate file.
+	# control-cert-file: "/etc/nsd/nsd_control.pem"
+
+
+# Secret keys for TSIGs that secure zone transfers.
+# You could include: "secret.keys" and put the 'key:' statements in there,
+# and give that file special access control permissions.
+#
+# key:
+	# The key name is sent to the other party, it must be the same
+	#name: "keyname"
+	# algorithm hmac-md5, or sha1, sha256, sha224, sha384, sha512
+	#algorithm: sha256
+	# secret material, must be the same as the other party uses.
+	# base64 encoded random number.
+	# e.g. from dd if=/dev/random of=/dev/stdout count=1 bs=32 | base64
+	#secret: "K2tf3TRjvQkVCmJF3/Z9vA=="
+
+
+# Patterns have zone configuration and they are shared by one or more zones.
+# 
+# pattern:
+	# name by which the pattern is referred to
+	#name: "myzones"
+	# the zonefile for the zones that use this pattern.
+	# if relative then from the zonesdir (inside the chroot).
+	# the name is processed: %s - zone name (as appears in zone:name).
+	# %1 - first character of zone name, %2 second, %3 third.
+	# %z - topleveldomain label of zone, %y, %x next labels in name.
+	# if label or character does not exist you get a dot '.'.
+	# for example "%s.zone" or "zones/%1/%2/%3/%s" or "secondary/%z/%s"
+	#zonefile: "%s.zone"
+	
+	# If no master and slave access control elements are provided,
+	# this zone will not be served to/from other servers.
+
+	# A master zone needs notify: and provide-xfr: lists.  A slave
+	# may also allow zone transfer (for debug or other secondaries).
+	# notify these slaves when the master zone changes, address TSIG|NOKEY
+	# IP can be ipv4 and ipv6, with @port for a nondefault port number.
+	#notify: 192.0.2.1 NOKEY
+	# allow these IPs and TSIG to transfer zones, addr TSIG|NOKEY|BLOCKED
+	# address range 192.0.2.0/24, 1.2.3.4&255.255.0.0, 3.0.2.20-3.0.2.40
+	#provide-xfr: 192.0.2.0/24 my_tsig_key_name
+	# set the number of retries for notify.
+	#notify-retry: 5
+
+	# uncomment to provide AXFR to all the world
+	# provide-xfr: 0.0.0.0/0 NOKEY
+	# provide-xfr: ::0/0 NOKEY
+
+	# A slave zone needs allow-notify: and request-xfr: lists.
+	#allow-notify: 2001:db8::0/64 my_tsig_key_name
+	# By default, a slave will request a zone transfer with IXFR/TCP.
+	# If you want to make use of IXFR/UDP use: UDP addr tsigkey
+	# for a master that only speaks AXFR (like NSD) use AXFR addr tsigkey
+	#request-xfr: 192.0.2.2 the_tsig_key_name
+	# Attention: You cannot use UDP and AXFR together. AXFR is always over 
+	# TCP. If you use UDP, we higly recommend you to deploy TSIG.
+	# Allow AXFR fallback if the master does not support IXFR. Default
+	# is yes.
+	#allow-axfr-fallback: yes
+	# set local interface for sending zone transfer requests.
+	# default is let the OS choose.
+	#outgoing-interface: 10.0.0.10
+	# limit the refresh and retry interval in seconds.
+	#max-refresh-time: 2419200
+	#min-refresh-time: 0
+	#max-retry-time: 1209600
+	#min-retry-time: 0
+	# Slave server tries zone transfer to all masters and picks highest
+	# zone version available, for when masters have different versions.
+	#multi-master-check: no
+
+	# limit the zone transfer size (in bytes), stops very large transfers
+	# 0 is no limits enforced.
+	# size-limit-xfr: 0
+
+	# if compiled with --enable-zone-stats, give name of stat block for
+	# this zone (or group of zones).  Output from nsd-control stats.
+	# zonestats: "%s"
+
+	# if you give another pattern name here, at this point the settings
+	# from that pattern are inserted into this one (as if it were a 
+	# macro).  The statement can be given in between other statements,
+	# because the order of access control elements can make a difference
+	# (which master to request from first, which slave to notify first).
+	#include-pattern: "common-masters"
+
+
+# Fixed zone entries.  Here you can config zones that cannot be deleted.
+# Zones that are dynamically added and deleted are put in the zonelist file.
+#
+# zone:
+ 	# name: "example.com"
+ 	# you can give a pattern here, all the settings from that pattern
+ 	# are then inserted at this point
+ 	# include-pattern: "master"
+ 	# You can also specify (additional) options directly for this zone.
+ 	# zonefile: "example.com.zone"
+ 	# request-xfr: 192.0.2.1 example.com.key
+
+