gistfile1.txt

  def self.search_ip(provider, server_name)
    if provider == "openstack" then
      server = Fog::Compute.new({
          :provider            => provider,
          :openstack_auth_url  => ENV['OS_AUTH_URL'] || "",
          :openstack_username  => ENV['OS_USERNAME'] || "",
          :openstack_tenant    => ENV['OS_TENANT_NAME'] || "",
          :openstack_api_key   => ENV['OS_API_KEY'] || "",
          :openstack_region    => ENV['OS_REGION_NAME'] || ""
      })
      instance = server.servers.find { |i| i.name = server_name }
      return instance.addresses['dmz-net'][0]['addr']
    elsif provider == "AWS" then
      server = Fog::Compute.new({
          :provider              => provider,
          :aws_access_key_id     => ENV["AWS_ACCESS_KEY_ID"] || "",
          :aws_secret_access_key => ENV["AWS_SECRET_ACCESS_KEY"] || "",
          :region                => ENV["AWS_REGION"] || ""
      })
      instance = server.servers.find { |i| i.tags['Name'] =server_name }
      return instance.dns_name
    end
  end
  
p Server.search_ip('openstack', 'instance-lb')
p Server.search_ip('AWS', 'instance-lb')

gistfile2.txt

$ ruby fog-file.rb
"192.168.0.24"
"ec2-54-65-13-167.ap-northeast-1.compute.amazonaws.com"