private static boolean useCpuSocketAffinity(Element nodesElement) {
        if (nodesElement.hasAttribute(VespaDomBuilder.CPU_SOCKET_AFFINITY_ATTRIB_NAME))
            return Boolean.parseBoolean(nodesElement.getAttribute(VespaDomBuilder.CPU_SOCKET_AFFINITY_ATTRIB_NAME));
        else
            return false;
    }
Allocate a container cluster without a nodes tag
config-model/src/main/java/com/yahoo/vespa/model/container/xml/ContainerModelBuilder.java