To created replication (master-slave) on ServerX slave-server (suppose that its IP is 192.168.1.4) and ServerY master-Server (suppose that its IP is 192.168.1.135), below is the procedure step by step:

1. @ServerY (Master): add this to my.cnf:
   

   server-id               = 1
   log_bin                 = /var/log/mysql/mysql-bin.log
   expire_logs_days        = 10
   max_binlog_size         = 100M
   #For the greatest possible durability and consistency in a replication 
   #setup using InnoDB with transactions
   innodb_flush_log_at_trx_commit  =1
   sync_binlog                     =1
   

2. @ServerX(Slave) add this
   

   server-id                   = 2
   log_bin                     = /var/log/mysql/mysql-bin.log
   log-slave-updates           =yes
   #set log-slave-update IF you want to chain replication servers, 
   #otherwise just drop it
   

3. create slave users on ServerY
   mysql> grant replication slave on *.* to 'slave'@'192.168.1.4'  IDENTIFIED BY 'Mypass';
4. copy DB from ServerY to ServerX
5. run 
mysqladmin -uroot -pth3gat3sql shutdown
6. run 
tar cf /tmp/MyDB.tar ./MyDB
7. @ServerX run
   scp Username@192.168.1.35:/tmp/MyDB.tar /var/lib/mysql
   
tar -xvf MyDB.tar
8. @ServerY: 
mysql>FLUSH TABLES WITH READ LOCK;

   mysql> show master status;
   Save the result of show master status
9. @ServerX, Run run this query:
   
CHANGE MASTER TO
   MASTER_HOST='192.168.1.135',
   MASTER_USER='slave',
   MASTER_PASSWORD='MyDB',
   MASTER_LOG_FILE='mysql-bin.000003',
   MASTER_LOG_POS=106;
   the values of MASTER_LOG_FILE and MASTER_LOG_POS are those came from show master status on ServerY.
10. now to be sure that your replication is fine
    
@ServerX:

    show slave status
    Slave_IO_Running and Slave_SQL_Running MUST be Yes for both.