def METHOD_NAME(self, soln_stk, container_cfg):
    """
    Copies the appropriate Dockerfile (preconfigured Docker) that match the
    given solution stack to given destination. For example, with the given
    solution stack:
    64bit Debian jessie v1.2.0 running GlassFish 4.1 Java 8 (Preconfigured - Docker)
    copy Dockerfile with name
    glassfish-runtime-4.1-jdk8
    to destination_dockerfile.
    :param destination_dockerfile: str: destination Dockerfile location
    :param soln_stk: SolutionStack: solution stack
    :param container_cfg: dict: container_config.json
    :return: None
    """
    assert(containerops.is_preconfigured(soln_stk, container_cfg))
    dfile_path = containerops._get_runtime_dockerfile_path(soln_stk,
                                                           container_cfg)
    shutil.copyfile(dfile_path, self.pathconfig.new_dockerfile_path())