setup mysql replication on CentOS error

[tentamen tentamen]

hi,

im using mysql 5.0.77 on centos 5.4 at both 2 server.

now, i want setup master-slave replication.

at master, i edit /etc/my.cnf file

log-bin = /var/log/mysql/mysql-bin.log
binlog-do-db=exampledb
server-id=1

after restart mysql, i create mysql user with replication privileges

STOP SLAVE;
GRANT REPLICATION SLAVE ON *.* TO 'slave_user'@'%' IDENTIFIED BY 'slave_password';
FLUSH PRIVILEGES;

next, i check master status, but it show empty set

USE exampledb;
FLUSH TABLES WITH READ LOCK;
SHOW MASTER STATUS;
Empty set (0.00 sec)

replication dont work?

help me,

thanks
Quan