def replicate_global_dbs(cloud_url=None, local_url=None):
    """
    Set up replication of the global databases from the cloud server to the
    local server.

    :param str cloud_url: Used to override the cloud url from the global
    configuration in case the calling function is in the process of
    initializing the cloud server
    :param str local_url: Used to override the local url from the global
    configuration in case the calling function is in the process of
    initializing the local server
    """
    local_url = local_url or config["local_server"]["url"]
    cloud_url = cloud_url or config["cloud_server"]["url"]
    server = Server(local_url)
    for db_name in global_dbs:
        server.replicate(
            db_name, urljoin(cloud_url, db_name), db_name, continuous=True,
        )