Roadworker

Roadworker is a tool to manage Route53.

It defines the state of Route53 using DSL, and updates Route53 according to DSL.

Notice

Roadworker cannot update TTL of two or more same weighted A records (with different SetIdentifier) after creation.

Installation

Add this line to your application's Gemfile:

gem 'roadworker'

And then execute:

$ bundle

Or install it yourself as:

$ gem install roadworker

Usage

export AWS_ACCESS_KEY_ID='...'
export AWS_SECRET_ACCESS_KEY='...'
roadwork -e -o Routefile
vi Routefile
roadwork -a --dry-run
roadwork -a

Help

Usage: roadwork [options]
    -p, --profile PROFILE_NAME
        --credentials-path PATH
    -k, --access-key ACCESS_KEY
    -s, --secret-key SECRET_KEY
    -a, --apply
    -f, --file FILE
        --dry-run
        --force
        --health-check-gc
    -e, --export
    -o, --output FILE
        --split
        --with-soa-ns
    -t, --test
        --nameservers SERVERS
        --port PORT
        --target-zone REGEXP
        --exclude-zone REGEXP
        --no-color
        --debug

Routefile example

require 'other/routefile'

hosted_zone "winebarrel.jp." do
  rrset "winebarrel.jp.", "A" do
    ttl 300
    resource_records(
      "127.0.0.1",
      "127.0.0.2"
    )
  end

  rrset "winebarrel.jp.", "MX" do
    ttl 300
    resource_records(
      "10 mx.winebarrel.jp",
      "10 mx2.winebarrel.jp"
    )
  end
end

hosted_zone "info.winebarrel.jp." do
  rrset "xxx.info.winebarrel.jp.", "A" do
    dns_name "elb-dns-name.elb.amazonaws.com"
  end

  rrset "yyy.info.winebarrel.jp.", "A" do
    dns_name "elb-dns-name2.elb.amazonaws.com", :evaluate_target_health => true
  end

  rrset "zzz.info.winebarrel.jp", "A" do
    set_identifier "Primary"
    failover "PRIMARY"
    health_check "http://example.com:80/path", :search_string => "ANY_RESPONSE_STRING", :request_interval => 30, :failure_threshold => 3
    # If you want to specify the IP address:
    #health_check "http://192.0.43.10:80/path", :host => "example.com",...
    ttl 456
    resource_records(
      "127.0.0.1",
      "127.0.0.2"
    )
  end

  rrset "zzz.info.winebarrel.jp", "A" do
    set_identifier "Secondary"
    failover "SECONDARY"
    health_check "tcp://192.0.43.10:3306", :request_interval => 30, :failure_threshold => 3
    ttl 456
    resource_records(
      "127.0.0.3",
      "127.0.0.4"
    )
  end
end

# Private HostedZone
hosted_zone "winebarrel.local." do
  vpc "us-east-1", "vpc-xxxxxxxx"
  vpc "us-east-2", "vpc-xxxxxxxx"

  rrset "winebarrel.local.", "A" do
    ttl 300
    resource_records(
      "10.0.0.1",
      "10.0.0.2"
    )
  end
end

Calculated Health Checks

rrset "zzz.info.winebarrel.jp", "A" do
  set_identifier "Secondary"
  failover "SECONDARY"
  health_check :calculated => ["07c03a45-5b69-4044-9ec3-016cd8e5f74b", "bba4d1ea-27c2-4d0c-a249-c857a3e46d88"], :health_threshold => 1, :inverted => false
  ttl 456
  resource_records(
    "127.0.0.3",
    "127.0.0.4"
  )
end

Cloudwatch Metric Health Checks

rrset "zzz.info.winebarrel.jp", "A" do
  set_identifier "Secondary"
  failover "SECONDARY"
  health_check :cloudwatch_metric => {:region=>"ap-northeast-1", :name=>"MyCheck"}, :inverted => false, :insufficient_data_health_status => "LastKnownStatus"
  ttl 456
  resource_records(
    "127.0.0.3",
    "127.0.0.4"
  )
end

Dynamic private DNS example

require 'aws-sdk'

hosted_zone "us-east-1.my.local." do
  vpc "us-east-1", "vpc-xxxxxxxx"

  resp = Aws::EC2::Client.new(region: "us-east-1").describe_instances(filters:[{ name: 'vpc-id', values: ["vpc-xxxxxxxx"] }])
  instances = resp.reservations.each_with_object({}) do |reservation, reservations|
    reservations.merge!(reservation.instances.each_with_object({}) do |instance, instances|
      tag_name = instance.tags.find {|tag| tag['key'] == 'Name' }
      instances[instance.private_ip_address] = tag_name['value'] if tag_name and tag_name['value'] != ''
    end)
  end

  instances.each {|private_ip_address, tag_name|
    rrset "#{tag_name}.us-east-1.my.local.", "A" do
      ttl 300
      resource_records private_ip_address
    end
  }
end

Use template

template "default_rrset" do
  rrset context.name + "." + context.hosted_zone_name, "A" do
    ttl context.ttl
    resource_records(
      "127.0.0.1"
    )
  end
end

hosted_zone "winebarrel.jp." do
  context.ttl = 100
  include_template "default_rrset", :name => "www"
  include_template "default_rrset", :name => "www2"
end

Exclude specific records from management under Roadworker

Use this if your zone contains rrsets managed by other tools, and you want to ignore them in Roadworker.

hosted_zone "winebarrel.jp." do
  ignore "ignore.winebarrel.jp"
  ignore /^regexp-ignore/

  # *.ignore2.winebarrel.jp and ignore2.winebarrel.jp
  ignore_under "ignore2.winebarrel.jp"
end

Test

Routefile compares the results of a query to the DNS and DSL in the test mode.

shell> roadwork -t
..F..
info.winebarrel.jp. A:
  expected=127.0.0.1(300),127.0.0.3(300)
  actual=127.0.0.1(300),127.0.0.2(300)
5 examples, 1 failure

(Please note test of A(Alias) is not possible to perfection...)

Demo

DNS management using GitHub/Bitbucket

Link

RubyGems.org site

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