Compare commits
1 Commits
| Author | SHA1 | Date | |
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| 9e1968b1be |
@@ -208,20 +208,6 @@ vault::disable_mlock: false
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profiles::dns::base::nameservers:
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- 198.18.19.16
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profiles::dns::master::basedir: '/var/named/sources'
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# dns record publishing. During the k8s cutover both methods run; set
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# manage_export false once k8s is authoritative.
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# - export: legacy exported-resources -> puppet DNS master
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# - nsupdate: RFC2136 to the k8s bind-authoritative write endpoint (.9),
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# inert until the TSIG key is set in eyaml:
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# profiles::dns::updater::key_secret: ENC[...]
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# (must match the key the bind-authoritative zones allow-update
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# with; algorithm hmac-sha256)
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profiles::dns::updater::manage_export: true
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profiles::dns::updater::manage_nsupdate: true
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profiles::dns::updater::server: '198.18.200.9'
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profiles::dns::updater::key_name: 'client-update'
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profiles::dns::updater::key_algorithm: 'hmac-sha256'
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#profiles::dns::base::ns_role: 'roles::infra::dns::resolver'
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#profiles::dns::base::use_ns: 'region'
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profiles::consul::server::members_role: roles::infra::storage::consul
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@@ -1,88 +0,0 @@
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# frozen_string_literal: true
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# lib/facter/dns_records.rb
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#
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# Reports this host's expected DNS records (assembled by profiles::dns::updater
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# into its records file) versus what is currently deployed on the authoritative
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# server, so puppet can detect drift and re-apply.
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#
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# Structured value:
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# { server, count, expected => [{zone,fqdn,type,ttl,value}], in_sync,
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# drift => [{...,deployed => [...]}] }
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# Helpers for the dns_records fact.
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module DnsRecordsFact
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RECORDS_FILE = '/var/lib/dns-updater/records'
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SERVER_FILE = '/var/lib/dns-updater/server'
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module_function
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# normalise a value for comparison: strip, drop trailing dot, downcase
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def norm(value)
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value.to_s.strip.chomp('.').downcase
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end
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def server
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File.exist?(SERVER_FILE) ? File.read(SERVER_FILE).strip : nil
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end
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# a name relative to a zone (or @) as a fully-qualified name
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def to_fqdn(name, zone)
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return "#{zone}." if name.to_s.empty? || name == '@'
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"#{name}.#{zone}."
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end
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# parse one "zone|name|type|ttl|value" line into a record hash (nil to skip)
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def parse_line(line)
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line = line.strip
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return nil if line.empty? || line.start_with?('#')
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zone, name, type, ttl, value = line.split('|', 5)
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return nil unless zone && type && value
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{ 'zone' => zone, 'fqdn' => to_fqdn(name, zone), 'type' => type, 'ttl' => ttl, 'value' => value }
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end
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# parse the records file into record hashes
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def expected
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return [] unless File.exist?(RECORDS_FILE)
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File.readlines(RECORDS_FILE).filter_map { |line| parse_line(line) }
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end
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# the values currently deployed for a record, per the authoritative server
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def deployed(record, srv)
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cmd = ['dig', '+short', '+time=2', '+tries=1']
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cmd << "@#{srv}" if srv && !srv.empty?
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cmd += [record['fqdn'], record['type']]
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out = Facter::Core::Execution.execute(cmd.join(' '), on_fail: '')
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out.to_s.split("\n").map { |line| norm(line) }.reject(&:empty?)
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end
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def report
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srv = server
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exp = expected
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drift = exp.filter_map do |record|
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dep = deployed(record, srv)
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record.merge('deployed' => dep) unless dep.include?(norm(record['value']))
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end
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{ 'server' => srv, 'count' => exp.length, 'expected' => exp, 'in_sync' => drift.empty?, 'drift' => drift }
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end
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end
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Facter.add(:dns_records) do
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confine kernel: 'Linux'
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setcode do
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File.exist?(DnsRecordsFact::RECORDS_FILE) ? DnsRecordsFact.report : nil
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end
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end
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# Convenience boolean for `if $facts['dns_records_insync']` guards.
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Facter.add(:dns_records_insync) do
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confine kernel: 'Linux'
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setcode do
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v = Facter.value(:dns_records)
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v.nil? ? nil : v['in_sync']
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end
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end
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@@ -11,12 +11,9 @@ class profiles::dns::base (
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Optional[String] $ns_role = undef,
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){
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# install bind_utils (provides nsupdate)
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# install bind_utils
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include bind::updater
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# assemble the host's DNS records and nsupdate them to the authoritative server
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include profiles::dns::updater
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# if ns_role is set, find all hosts matching that enc_role
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$nameserver_array = $ns_role ? {
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undef => $nameservers,
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@@ -1,10 +1,4 @@
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# profiles::dns::record
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#
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# Declares a DNS record for this host. Publishes it via either or both methods,
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# controlled by profiles::dns::updater's toggles (both on during cutover):
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# - nsupdate: a local concat fragment consumed by profiles::dns::updater,
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# which nsupdates it to the authoritative server.
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# - export: the legacy @@concat::fragment exported to the puppet DNS master.
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# defines the base record that will be exported
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define profiles::dns::record (
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String $record,
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Enum[
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@@ -19,26 +13,11 @@ define profiles::dns::record (
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String $value,
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String $zone,
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Integer $order,
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Integer $ttl = 300,
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Stdlib::AbsolutePath $basedir = lookup('profiles::dns::master::basedir'),
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) {
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include profiles::dns::updater
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# new: local records file consumed by the nsupdate service
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if $profiles::dns::updater::manage_nsupdate {
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# zone|name|type|ttl|value (parsed by the dns-update script)
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concat::fragment { "dns-record-${name}":
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target => $profiles::dns::updater::records_file,
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content => "${zone}|${record}|${type}|${ttl}|${value}\n",
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order => sprintf('%03d', $order),
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}
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}
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# legacy: export the fragment to the puppet DNS master
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if $profiles::dns::updater::manage_export {
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@@concat::fragment { "${zone}_${name}":
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target => "${profiles::dns::updater::master_basedir}/${zone}.conf",
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target => "${basedir}/${zone}.conf",
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content => "${record} IN ${type} ${value}\n",
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order => $order,
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}
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}
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}
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@@ -1,127 +0,0 @@
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# profiles::dns::updater
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#
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# Publishes this host's DNS records. Two methods, independently toggled so both
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# can run during the k8s cutover (profiles::dns::record honours the same flags):
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#
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# - nsupdate ($manage_nsupdate): assemble the records into a local file and
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# nsupdate them to the k8s authoritative write endpoint via a systemd .path
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# unit that watches the file. Inert until $key_secret (TSIG) is set.
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# - export ($manage_export): the legacy exported-resources flow to the puppet
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# DNS master. Kept during cutover; disable once k8s is authoritative.
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#
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# nsupdate comes from bind-utils (installed via bind::updater in
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# profiles::dns::base).
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class profiles::dns::updater (
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Boolean $manage_nsupdate = true,
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Boolean $manage_export = true,
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String $server = '198.18.200.9',
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String $key_name = 'client-update',
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String $key_algorithm = 'hmac-sha256',
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Optional[Sensitive[String]] $key_secret = undef,
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Integer $default_ttl = 300,
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Stdlib::AbsolutePath $records_file = '/var/lib/dns-updater/records',
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Stdlib::AbsolutePath $state_dir = '/var/lib/dns-updater',
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Stdlib::AbsolutePath $config_dir = '/etc/dns-updater',
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Stdlib::AbsolutePath $master_basedir = lookup('profiles::dns::master::basedir'),
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) {
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$state_file = "${state_dir}/applied"
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$server_file = "${state_dir}/server"
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$key_file = "${config_dir}/key"
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if $manage_nsupdate {
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file { $state_dir:
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ensure => directory,
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owner => 'root',
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group => 'root',
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mode => '0755',
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}
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# Server address, read by the dns_records fact for drift detection.
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file { $server_file:
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ensure => file,
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owner => 'root',
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group => 'root',
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mode => '0644',
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content => "${server}\n",
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require => File[$state_dir],
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}
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# Records file, assembled from profiles::dns::record fragments.
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concat { $records_file:
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ensure => present,
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owner => 'root',
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group => 'root',
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mode => '0644',
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ensure_newline => true,
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warn => false,
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require => File[$state_dir],
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}
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concat::fragment { 'dns-update-header':
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target => $records_file,
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content => "# Managed by puppet (profiles::dns::record): zone|name|type|ttl|value\n",
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order => '00',
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}
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if $key_secret =~ Undef {
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notify { 'dns-updater-inert':
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message => 'profiles::dns::updater: key_secret unset; records assembled but not applied.',
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loglevel => 'info',
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}
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} else {
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file { $config_dir:
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ensure => directory,
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owner => 'root',
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group => 'root',
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mode => '0700',
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}
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file { $key_file:
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ensure => file,
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owner => 'root',
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group => 'root',
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mode => '0600',
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show_diff => false,
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content => Sensitive(epp('profiles/dns/tsig-key.epp', {
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'name' => $key_name,
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'algorithm' => $key_algorithm,
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'secret' => $key_secret.unwrap,
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})),
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}
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file { '/usr/local/bin/dns-update':
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ensure => file,
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owner => 'root',
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group => 'root',
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mode => '0755',
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content => epp('profiles/dns/dns-update.sh.epp', {
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'server' => $server,
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'key_file' => $key_file,
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'records_file' => $records_file,
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'state_file' => $state_file,
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}),
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}
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systemd::unit_file { 'dns-update.service':
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content => epp('profiles/dns/dns-update.service.epp', { 'script' => '/usr/local/bin/dns-update' }),
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}
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# The .path unit watches the records file and triggers the service.
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systemd::unit_file { 'dns-update.path':
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content => epp('profiles/dns/dns-update.path.epp', { 'records_file' => $records_file }),
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active => true,
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enable => true,
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}
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# Also apply within the puppet run whenever the records change.
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exec { 'dns-update-apply':
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command => '/usr/local/bin/dns-update',
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refreshonly => true,
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subscribe => Concat[$records_file],
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require => [File['/usr/local/bin/dns-update'], File[$key_file]],
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}
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}
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}
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}
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@@ -1,10 +0,0 @@
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<%- | String $records_file | -%>
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[Unit]
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Description=Watch the DNS records file and apply changes
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[Path]
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PathModified=<%= $records_file %>
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Unit=dns-update.service
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[Install]
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WantedBy=multi-user.target
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@@ -1,9 +0,0 @@
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<%- | String $script | -%>
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[Unit]
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Description=Apply host DNS records via nsupdate
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After=network-online.target
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Wants=network-online.target
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[Service]
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Type=oneshot
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ExecStart=<%= $script %>
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@@ -1,56 +0,0 @@
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<%- | String $server, String $key_file, String $records_file, String $state_file | -%>
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#!/bin/bash
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# Managed by puppet (profiles::dns::updater). Applies this host's records to the
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# authoritative DNS server via TSIG nsupdate. Only the delta since the last
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# successful run is sent; removed records are deleted.
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set -euo pipefail
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SERVER="<%= $server %>"
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KEYFILE="<%= $key_file %>"
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RECORDS="<%= $records_file %>"
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STATE="<%= $state_file %>"
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[ -f "$RECORDS" ] || exit 0
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touch "$STATE"
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# Format per line: zone|name|type|ttl|value (name is relative to zone, or @).
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desired="$(grep -vE '^[[:space:]]*(#|$)' "$RECORDS" | sort -u || true)"
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applied="$(grep -vE '^[[:space:]]*(#|$)' "$STATE" 2>/dev/null | sort -u || true)"
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[ "$desired" = "$applied" ] && exit 0
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fqdn() { # name zone
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if [ -z "$1" ] || [ "$1" = "@" ]; then printf '%s.' "$2"; else printf '%s.%s.' "$1" "$2"; fi
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}
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msg="$(mktemp)"
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trap 'rm -f "$msg"' EXIT
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printf 'server %s\n' "$SERVER" >> "$msg"
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# Process per zone so each UPDATE message targets a single zone.
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zones="$(printf '%s\n%s\n' "$desired" "$applied" | cut -d'|' -f1 | sort -u | grep -v '^$' || true)"
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for zone in $zones; do
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printf 'zone %s.\n' "$zone" >> "$msg"
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# Additions/updates: replace the RRset for every desired record in this zone.
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printf '%s\n' "$desired" | awk -F'|' -v z="$zone" 'NF>=5 && $1==z' | \
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while IFS='|' read -r z name type ttl value; do
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f="$(fqdn "$name" "$z")"
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printf 'update delete %s %s\n' "$f" "$type" >> "$msg"
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printf 'update add %s %s %s %s\n' "$f" "$ttl" "$type" "$value" >> "$msg"
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done
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# Deletions: records present last run but gone now.
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comm -23 <(printf '%s\n' "$applied") <(printf '%s\n' "$desired") | \
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awk -F'|' -v z="$zone" 'NF>=5 && $1==z' | \
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while IFS='|' read -r z name type ttl value; do
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f="$(fqdn "$name" "$z")"
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printf 'update delete %s %s %s\n' "$f" "$type" "$value" >> "$msg"
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done
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printf 'send\n' >> "$msg"
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done
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if nsupdate -k "$KEYFILE" "$msg"; then
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printf '%s\n' "$desired" > "$STATE"
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else
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echo "dns-update: nsupdate to ${SERVER} failed" >&2
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exit 1
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fi
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@@ -1,5 +0,0 @@
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<%- | String $name, String $algorithm, String $secret | -%>
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key "<%= $name %>" {
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algorithm <%= $algorithm %>;
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secret "<%= $secret %>";
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};
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Reference in New Issue
Block a user