Script to map in ssh_config the opsworks instances alias for vary regions

opsworks_generator.rb

#!/usr/bin/env ruby

require "rubygems"
require "aws-sdk"
require "pry-nav"

def run_ops_client(opsworks, file_path)
  true_instances = []

  stacks = opsworks.describe_stacks.stacks

  stacks.each do |stack|
    layers = opsworks.describe_layers({ stack_id: stack.stack_id }).layers

    layers.each do |layer|
      instances = opsworks.describe_instances({ layer_id: layer.layer_id }).instances

      instances.each do |instance|
        unless instance.private_ip.nil?
          true_instances << TrueInstance.new(instance.hostname, instance.private_ip, layer.name, stack.name, instance.public_ip, false)
        else
          true_instances << TrueInstance.new(instance.hostname, instance.private_ip, layer.name, stack.name, instance.public_ip, true)
        end
      end
    end
  end

  true_instances.sort!{|a, b| a.hostname <=> b.hostname }
  valid_instances = true_instances - true_instances.select(&:off)

  File.open(file_path, 'a') do |f|
    valid_instances.each do |instance|
      f.write("# Project #{instance.stack}\n")
      f.write("# Layer #{instance.layer}\n")
      f.write("# Public IP #{instance.public_ip}\n")
      f.write("Host #{instance.hostname}\n")
      f.write("\s\sHostName #{instance.public_ip}\n")
      f.write("\s\sPort 22\n")
      f.write("\s\sUser ubuntu\n")
      f.write("\s\sIdentityFile ~/.ssh/opsworks\n")
      f.write("\n")
    end
    
    # true_instances.select(&:off).each do |instance|
    #    f.write("# Project #{instance.stack}\n")
    #    f.write("# Layer #{instance.layer}\n")
    #    f.write("# Public IP #{instance.public_ip}\n")
    #    f.write("#Host #{instance.hostname}\n")
    #    f.write("#\s\sHostName #{instance.private_ip}\n")
    #    f.write("#\s\sPort 22\n")
    #    f.write("#\s\sUser ubuntu\n")
    #    f.write("#\s\sIdentityFile ~/.ssh/opsworks\n")
    #    f.write("\n")
    # end
  end
end

# -- Constructor
opsworks_cli = []
opsworks_cli << Aws::OpsWorks::Client.new(region: "us-east-1")
opsworks_cli << Aws::OpsWorks::Client.new(region: "sa-east-1")

# Doctor account
c = Aws::Credentials.new(ENV['DR_AWS_ACCESS_KEY_ID'], ENV['DR_AWS_SECRET_ACCESS_KEY'])
opsworks_cli << Aws::OpsWorks::Client.new(region: "us-east-1", credentials:c)

TrueInstance = Struct.new(:hostname, :private_ip, :layer, :stack, :public_ip, :off)
file_path = File.join(File.dirname(__FILE__), '..', 'config')
File.open(file_path, 'w') {|f| f.write ''}
opsworks_cli.each{|i| run_ops_client(i, file_path)}