動的にec2のipを取得する

script.rb

require 'aws-sdk'

credentials = Aws::Credentials.new(ENV['AWS_ACCESS_KEY_ID'], ENV['AWS_SECRET_ACCESS_KEY'])
ec2 = Aws::EC2::Client.new(region: ENV['AWS_DEFAULT_REGION'], credentials: credentials)

res = ec2.describe_instances(
  {
    filters: [
      {
        name: "tag:Environment",
        values: ["Staging"],
      },
      {
        name: "instance-state-name",
        values: ["running"],
      },
    ],
  }
)

web = res.reservations.flat_map(&:instances).select { |instance|
  instance.tags.any? { |tag| tag.key == "Role" && tag.value == "Web" }
}.map(&:private_ip_address)

batch = res.reservations.flat_map(&:instances).select { |instance|
  instance.tags.any? { |tag| tag.key == "Role" && tag.value == "batch" }
}.map(&:private_ip_address)