AWS SDK Route 53 list zone entries.

route53_list.rb

require 'aws-sdk'
route53 = Aws::Route53::Client.new(
  region: 'sa-east-1',
  access_key_id: 'xxxxxx',
  secret_access_key: 'xxxxxx'
)

response = route53.list_resource_record_sets(
  :hosted_zone_id => "xxxxxx",
)

puts response[:resource_record_sets].map{|r| r[:name]}