log-bin = mysql-bin
server-id = 1
binlog_format = MIXED   ## or ROW?
enforce-gtid-consistency
gtid-mode=ON
binlog_do_db = foo  ## dont know if this is needed?
log-slave-updates     ## dont know if this is needed?
relay-log-recovery    ## dont know if this is needed?

create user 'replicator'@'%' identified by 'xxx';
grant replication slave on *.* to 'replicator'@'%';

server_id = 2
log_bin = mysql-bin
binlog_format = MIXED  ## or ROW?
skip_slave_start            ## is this needed?  What if this server becomes master???
gtid_mode = on
enforce_gtid_consistency
log_slave_updates
binlog_do_db = foo  ## dont know if this is needed?

SQL> CHANGE MASTER TO
 MASTER_HOST='master_ip',
 MASTER_PORT=3306,
 MASTER_USER='slave_user_name',
 MASTER_PASSWORD='xxx',
 MASTER_AUTO_POSITION=???;

SQL> START SLAVE;