gistfile1.rb

   def ganglia_interface(host)
    if host[:ganglia] && host[:ganglia][:cluster] && host[:ganglia][:cluster][:interface]
      interface = host[:ganglia_cluster][:interface]
    else
      interface = host[:network][:default_interface]
    end
  end


  def ganglia_ip(host)
    interface = ganglia_interface(host)
    host[:network][:interfaces][interface][:addresses].each do |addr,value|
      if host[:network][:interfaces][interface][:addresses][addr][:family] == "inet"
        return addr
      end
    end
  end

  def get_ips(cluster)
    ips = []
    search(:node, "*").each do |host|
      if host[:ganglia] && host[:ganglia][:cluster] == cluster
        ipaddr = ganglia_ip(host)
        ips << ipaddr
      end
    end
    return ips
  end