private List<BindingPattern> serverBindings(DeployState deployState, ConfigModelContext context, Element searchElement, Collection<BindingPattern> defaultBindings) {
        List<Element> bindings = XML.getChildren(searchElement, "binding");
        if (bindings.isEmpty())
            return List.copyOf(defaultBindings);

        return toBindingList(deployState, context, bindings);
    }
Allocate a container cluster without a nodes tag
config-model/src/main/java/com/yahoo/vespa/model/container/xml/ContainerModelBuilder.java