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This article is about how to achieve mutual master-slave replication in mysql. Xiaobian thinks it is quite practical, so share it with you to learn. I hope you can gain something after reading this article. Let's not say much. Let's take a look at it together with Xiaobian.

Error:

1）

The change master caused:

Last_IO_Error: error connecting to master - retry-time: 60 retries

2）

Stop the slave process without unlocking:

> stop slave;

ERROR 1192 (HY000): Can't execute the given command because you have active locked tables or an active transaction

3）

change master syntax error, falling comma

mysql> change master to

-> master_host='IP'

-> master_user='USER',

-> master_password='PASSWD',

-> master_log_file='mysql-bin.000002',

-> master_log_pos=106;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'master_user='USER',

master_password='PASSWD',

master_log_file='mysql-bin.000002' at line 3

4）

Change master without stopping slave processes

mysql> change master to master_host=‘IP', master_user='USER', master_password='PASSWD', master_log_file='mysql-bin.000001',master_log_pos=106;

ERROR 1198 (HY000): This operation cannot be performed with a running slave; run STOP SLAVE first

5）

A B's server-id is the same:

Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids;

these ids must be different for replication to work (or the --replicate-same-server-id option must be used on

slave but this does not always make sense; please check the manual before using it).

View server-id

mysql> show variables like 'server_id';

Modify server-id manually

mysql> set global server_id=2; #The value here is the same as that set in my.cnf

mysql> slave start;

6) After changing master, check slave status and find slave_IO_running is NO

The above is how to realize mutual master-slave replication in mysql. Xiaobian believes that some knowledge points may be seen or used in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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