MYSQL的MASTER到MASTER的主主循环同步

以前抽空做的MYSQL 的主主同步。不过心理做好准备，对性能会有一定的影响！把步骤写下来，至于会出现的什么问题，以后随时更新。这里我同步的数据库是TEST1、环境描述。 主机：192.168.0.231（A） 主机：192.168.0.232（B） MYSQL 版本为5.1.212、授权用户。A：mysql> grant replication slave,file on *.* to 'repl1'@'192.168.0.232' identifiedby '123456';Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)B：mysql> grant replication slave,file on *.* to 'repl2'@'192.168.0.231' identifiedby '123456';Query OK, 0 rows affected (0.00 sec)mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)然后都停止MYSQL 服务器。3、配置文件。在两个机器上的my.cnf里面都开启二进制日志 。A：user = mysqllog-bin=mysql-binserver-id = 1binlog-do-db=testbinlog-ignore-db=mysqlreplicate-do-db=testreplicate-ignore-db=mysqllog-slave-updatesslave-skip-errors=allsync_binlog=1auto_increment_increment=2auto_increment_offset=1B：user = mysqllog-bin=mysql-binserver-id = 2binlog-do-db=testbinlog-ignore-db=mysqlreplicate-do-db=testreplicate-ignore-db=mysqllog-slave-updatesslave-skip-errors=allsync_binlog=1auto_increment_increment=2auto_increment_offset=2至于这些参数的说明具体看手册。红色的部分非常重要，如果一个MASTER 挂掉的话，另外一个马上接管。紫红色的部分指的是服务器频繁的刷新日志。这个保证了在其中一台挂掉的话，日志刷新到另外一台。从而保证了数据的同步 。4、重新启动MYSQL服务器。在A和B上执行相同的步骤[root@localhost ~]# /usr/local/mysql/bin/mysqld_safe &[1] 4264[root@localhost ~]# 071213 14:53:20 mysqld_safe Logging to '/usr/local/mysql/data/localhost.localdomain.err'./usr/local/mysql/bin/mysqld_safe: line 366: [: -eq: unary operator expected071213 14:53:20 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data5、进入MYSQL的SHELL。A：mysql> flush tables with read lockGQuery OK, 0 rows affected (0.00 sec)mysql> show master statusG*************************** 1. row *************************** File: mysql-bin.000007 Position: 528 Binlog_Do_DB: testBinlog_Ignore_DB: mysql1 row in set (0.00 sec)B：mysql> flush tables with read lock;Query OK, 0 rows affected (0.00 sec)mysql> show master statusG*************************** 1. row *************************** File: mysql-bin.000004 Position: 595 Binlog_Do_DB: testBinlog_Ignore_DB: mysql1 row in set (0.00 sec)然后备份自己的数据，保持两个机器的数据一致。方法很多。完了后看下一步。6、在各自机器上执行CHANGE MASTER TO命令。A：mysql> change master to -> master_host='192.168.0.232', -> master_user='repl2', -> master_password='123456', -> master_log_file='mysql-bin.000004', -> master_log_pos=595;Query OK, 0 rows affected (0.01 sec)mysql> start slave;Query OK, 0 rows affected (0.00 sec)B：mysql> change master to -> master_host='192.168.0.231', -> master_user='repl1', -> master_password='123456', -> master_log_file='mysql-bin.000007', -> master_log_pos=528;Query OK, 0 rows affected (0.01 sec)mysql> start slave;Query OK, 0 rows affected (0.00 sec)