config = new CompositeConfiguration();
if (System.getProperty("whirr.config") != null)
{
config.addConfiguration(
new PropertiesConfiguration(System.getProperty("whirr.config")));
}
config.addConfiguration(new PropertiesConfiguration("whirr-default.properties"));
clusterSpec = new ClusterSpec(config);
if (clusterSpec.getPrivateKey() == null)
{
Map<String, String> pair = KeyPair.generate();