private static void applyNodesTagJvmArgs(List<ApplicationContainer> containers, String jvmArgs) {
        for (Container container: containers) {
            if (container.getAssignedJvmOptions().isEmpty())
                container.prependJvmOptions(jvmArgs);
        }
    }
Allocate a container cluster without a nodes tag
config-model/src/main/java/com/yahoo/vespa/model/container/xml/ContainerModelBuilder.java