code: def _mongodump_exec(mongodump, address, port, user, passwd, db,
                      out_dir, auth_db, dry_run):
      
  
      # Log the call
      log.msg("mongodump [{mongodump}] db={db} auth_db={auth_db}" \
              " mongodb://{user}@{host}:{port} > {output}"
              .format(mongodump=mongodump, user=user, host=address,
                      port=port, db=db, auth_db=auth_db, output=out_dir))
  
      # Prepare the call
      args = "--host {host}:{port} -d {db} -u {user} -p {passwd} " \
             "--authenticationDatabase {auth_db} -o {output}"\
             .format(host=address, port=port, db=db, user=user, passwd=passwd,
                     auth_db=auth_db, output=out_dir)
  
      if not dry_run:
          # Make the actual call to mongodump
          shell.run(mongodump, args=args)
docs: Run mongodump on a database
  
      :param address: server host name or IP address
      :param port: server port
      :param user: user name
      :param passwd: password
      :param db: database name
      :param out_dir: output directory
      :param auth_db: authentication database
      :param dry_run: dry run mode
      :raises OSError: if mongodump process returns error