Capistrano実行時にEC2とかRDSを引っ張ってきてRole設定する - Qiita

require 'aws-sdk' set :aws_access_key_id, ENV['AWS_ACCESS_KEY_ID'] set :aws_secret_access_key, ENV['AWS_SECRET_ACCESS_KEY'] # EC2 if ENV['EC2_URL'] ec2=AWS::EC2.new(:ec2_endpoint => ENV['EC2_URL'].sub(/^https?:\/\//,"")) else ec2=AWS::EC2.new end instances = ec2.instances.select {|instance| instance.tags[:app] == 'true' && instance.status == :running}.map(&:private_ip_address) role :app, *instance