Configured MySQL replication but its not working

Question

I have configured MySQL master and slave replication setup on 5.5.x. But for some reason data is not getting replicated properly. What might be the reason?

At Master:

/etc/my.cnf

[mysqld]
log-bin=/var/lib/mysql/mysql-bin.log
server-id=1
innodb_flush_log_at_trx_commit=1
sync_binlog=1
binlog-do-db=cmdb
binlog-do-db=nagios

mysql> show master status;

+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 | 168019 | cmdb,nagios | |
+------------------+----------+--------------+------------------+

At Slave:

/etc/my.cnf

[mysqld]
server-id=2
log-bin=/var/lib/mysql/mysql-bin.log
innodb_flush_log_at_trx_commit=1
sync_binlog=1
report-host=10.10.0.22
replicate-do-db=cmdb
replicate-do-db=nagios

mysql> show slave status\G;

*************************** 1. row ***************************
 Slave_IO_State: Waiting for master to send event
 Master_Host: 10.10.0.21
 Master_User: replicator
 Master_Port: 3306
 Connect_Retry: 60
 Master_Log_File: mysql-bin.000005
 Read_Master_Log_Pos: 198123
 Relay_Log_File: CentOS62-relay-bin.000012
 Relay_Log_Pos: 198269
 Relay_Master_Log_File: mysql-bin.000005
 Slave_IO_Running: Yes
 Slave_SQL_Running: Yes
 Replicate_Do_DB: cmdb,nagios
 Replicate_Ignore_DB:
 Replicate_Do_Table:
 Replicate_Ignore_Table:
 Replicate_Wild_Do_Table:
 Replicate_Wild_Ignore_Table:
 Last_Errno: 0
 Last_Error:
 Skip_Counter: 0
 Exec_Master_Log_Pos: 198123
 Relay_Log_Space: 198574
 Until_Condition: None
 Until_Log_File:
 Until_Log_Pos: 0
 Master_SSL_Allowed: No
 Master_SSL_CA_File:
 Master_SSL_CA_Path:
 Master_SSL_Cert:
 Master_SSL_Cipher:
 Master_SSL_Key:
 Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
 Last_IO_Errno: 0
 Last_IO_Error:
 Last_SQL_Errno: 0
 Last_SQL_Error:
 Replicate_Ignore_Server_Ids:
 Master_Server_Id: 1
1 row in set (0.00 sec)

• RolandoMySQLDBA: Do you have other databases on the master besides cmdb and nagios ?
• Prakash: Yes there are few other databases in the master table.

Answer 1

What concerns me here is the use of both replicate-do-db on the Slave and binlog-do-db on the Master at the same time.

There is no need to use both. I would remove binlog-do-db from the Master. I would also look over any queries with fully qualified table names. Why ?

If you replicate any SQL use fully qualified table names (dbname.tblname) and you use replicate-do-db, MySQL Replication gets confused if you execute USE dbname.

Percona explained this in conjunction with binlog-do-db and replicate-do-db back in May 2009.

Percona also suggested reading the replication filtering rules thoroughly.

• Prakash: Thanks for your suggestion. I tried removing the binlog-do-db from the master & replication is happening. But I see a strange behavior. In the same table some of the columns are getting replicated but few of the columns are not getting replicated. What might be the reason??