Add TTL config option with default to 300sec

ref #4

CHANGELOG.md

@@ -1,13 +1,21 @@
 ## 2.2.0 (unreleased)
 
+### New Feautres:
+
+* Add global config for time-to-live via `VagrantDNS::Config.ttl`
+
 ### Fixes:
 
 * Fixes acceptance tests for macOS High Sierra (10.13) to cope with `scutil`s new output format
 * Adds the log-time missing `license` gem config
 
-### Changes:
+### Breaking Changes:
 
 * Removes the global and vm config  `ipv4only`. It was nver been used.
+
+### Changes:
+
+* Resources will now respond with a low TTL (time-to-live) of 5 minutes (300 seconds) instead of the old 24 hours by default. Use `VagrantDNS::Config.ttl = 86400` to reset to the old behaviour.
 * Internal changes on how the dns pattern config is read and written. (Now using `YAML::Store`)
 * Acceptance tests run against vagrant v2.1.4
 * Acceptance tests run against Ubuntu 18.04

README.md

@@ -137,6 +137,7 @@ We can use [multivm](https://www.vagrantup.com/docs/multi-machine/) configuratio
 ## Global Options
 
 * `VagrantDNS::Config.listen`: an Array of Arrays describing interfaces to bind to. Defaults to `[[:udp, "127.0.0.1", 5300]]`.
+* `VagrantDNS::Config.ttl`: The time-to-live in seconds for all resources. Defaults to `300` (5 minutes).
 * `VagrantDNS::Config.auto_run`: (re)start and reconfigure the server every time a machine is started. On by default.
 * `VagrantDNS::Config.check_public_suffix`: Check if you are going to configure a [Public Suffix](https://publicsuffix.org/) (like a Top Level Domain) in a VMs `tld(s)` config, which could mess up your local dev machines DNS config. Possible configuration values are:
   - `false`: Disables the feature.

lib/vagrant-dns/config.rb

@@ -3,12 +3,16 @@
 module VagrantDNS
   class Config < Vagrant.plugin(2, :config)
     class << self
-      attr_accessor :listen, :logger, :auto_run, :check_public_suffix
+      attr_accessor :listen, :ttl, :logger, :auto_run, :check_public_suffix
 
       def listen
         @listen ||= [[:udp, "127.0.0.1", 5300]]
       end
 
+      def ttl
+        @ttl ||= 300
+      end
+
       def auto_run
         return true if @auto_run.nil?
         @auto_run

lib/vagrant-dns/service.rb

@@ -33,11 +33,12 @@ def run!(run_options)
 
         registry = Registry.new(tmp_path).to_hash
         std_resolver = RubyDNS::Resolver.new(Async::DNS::System.nameservers)
+        ttl = VagrantDNS::Config.ttl
 
         RubyDNS::run_server(VagrantDNS::Config.listen) do
           registry.each do |pattern, ip|
             match(pattern, Resolv::DNS::Resource::IN::A) do |transaction, match_data|
-              transaction.respond!(ip)
+              transaction.respond!(ip, ttl: ttl)
             end
           end
 

testdrive/Vagrantfile

@@ -23,4 +23,5 @@ Vagrant.configure("2") do |config|
   config.vm.synced_folder ".", "/vagrant", disabled: true
 
   VagrantDNS::Config.listen = [[:udp, "0.0.0.0", 5300]]
+  VagrantDNS::Config.ttl = 30
 end