private static Collection<UserBindingPattern> userBindingPattern(String path, Set<Integer> portBindingOverride) {
        UserBindingPattern bindingPattern = UserBindingPattern.fromPattern(path);
        if (portBindingOverride.isEmpty()) return Set.of(bindingPattern);
        return portBindingOverride.stream()
                .map(bindingPattern::withOverriddenPort)
                .toList();
    }
Allocate a container cluster without a nodes tag
config-model/src/main/java/com/yahoo/vespa/model/container/xml/ContainerModelBuilder.java