def fe_servers
      res = @servers.select { |s| s.nickname =~ /Front End/ || s.nickname =~ /FrontEnd/ || s.nickname =~ /Apache with HAproxy/ || s.nickname =~ /Load Balancer/ }
      raise "FATAL: No frontend servers found" unless res.length > 0
      res
    end
def fe_servers
      res = @servers.select { |s| s.nickname =~ /Front End/ || s.nickname =~ /FrontEnd/ || s.nickname =~ /Apache with HAproxy/ || s.nickname =~ /Load Balancer/ }
      raise "FATAL: No frontend servers found" unless res.length > 0
      res
    end
require File.expand_path(File.dirname(__FILE__), "application")
 returns an Array of the Front End servers in the deployment