TemplateBuilder slaveTemplateBuilder = computeService.templateBuilder()
.options(runScript(slaveBootScript)
.installPrivateKey(clusterSpec.getPrivateKey())
.authorizePublicKey(clusterSpec.getPublicKey()));
slaveTemplateBuilder.fromTemplate(masterTemplate); // base on master
slaveTemplateBuilder.locationId(masterTemplate.getLocation().getId());
Template slaveTemplate = slaveTemplateBuilder.build();
instanceTemplate = clusterSpec.getInstanceTemplate(WORKER_ROLE);