def METHOD_NAME(self, service):
    umilit_file = '/etc/systemd/system/{}.service.d/override.conf'.format(service)
    if not os.path.exists(umilit_file):
        os.makedirs(os.path.dirname(umilit_file))
        self.writeFile(umilit_file, '[Service]\nLimitNOFILE=262144\n')