Push IP address changes to DNSimple from machines with dynamic IPs

dnsimple_dynamic_ip_update.rb

require 'dnsimple'

def update_dns
  # TODO: Put DNSimple username and API Key or password in ~/.dnsimple
  # See https://github.com/aetrion/dnsimple-ruby/blob/master/README.md#credentials
  DNSimple::Client.load_credentials_if_necessary

  # TODO replace with domain and record name
  record = find_record 'example.com', 'www'

  update_record_content record, local_ip
end

def find_record domain_name, record_name
  domain = DNSimple::Domain.find domain_name
  records = DNSimple::Record.all(domain)
  records.select! do |record|
    record.name == record_name
  end
  records.first
end

def update_record_content record, local_ip
  puts "[#{Time.now}] UPDATE #{record.name}.#{record.domain.name} -> #{local_ip}"
  record.content = local_ip
  record.save
end

def local_ip
  `curl --silent --connect-timeout 5 icanhazip.com`
end

update_dns