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require 'aws-sdk-core'

config = {
  :region => "ap-northeast-1"
}
client = Aws::EC2::Client.new(
   region: config[:region],
)

resp = client.describe_instances({
  filters: [
    {
      name: "tag-value",
      values: ["test"],
    },
  ]
})

puts resp.reservations[0].instances[0].public_ip_address