MYSQL 的 MASTER到MASTER的主主循环同步

刚刚抽空做了一下MYSQL 的主主同步。 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TEST 1、环境描述。    主机：192.168.0.231（A）    主机：192.168.0.232（B）    MYSQL 版本为5.1.21 2、授权用户。 A： mysql> grant replication slave,file on *.* to 'repl1'@'192.168.0.232' identified  by '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' identified  by '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 = mysql log-bin=mysql-bin server-id       = 1 binlog-do-db=test binlog-ignore-db=mysql replicate-do-db=test replicate-ignore-db=mysql log-slave-updates slave-skip-errors=all sync_binlog=1 auto_increment_increment=2 auto_increment_offset=1 B： user = mysql log-bin=mysql-bin server-id       = 2 binlog-do-db=test binlog-ignore-db=mysql replicate-do-db=test replicate-ignore-db=mysql log-slave-updates slave-skip-errors=all sync_binlog=1 auto_increment_increment=2 auto_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 expected 071213 14:53:20 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data 5、进入MYSQL的SHELL。 A： mysql> flush tables with read lock\G Query OK, 0 rows affected (0.00 sec) mysql> show master status\G *************************** 1. row ***************************             File: mysql-bin.000007         Position: 528     Binlog_Do_DB: test Binlog_Ignore_DB: mysql 1 row in set (0.00 sec) B： mysql> flush tables with read lock; Query OK, 0 rows affected (0.00 sec) mysql> show master status\G *************************** 1. row ***************************             File: mysql-bin.000004         Position: 595     Binlog_Do_DB: test Binlog_Ignore_DB: mysql 1 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) 7、查看各自机器上的IO进程和 SLAVE进程是否都开启。 A： mysql> show processlist\G *************************** 1. row ***************************      Id: 2    User: repl    Host: 192.168.0.232:54475      db: NULL Command: Binlog Dump    Time: 1590 State: Has sent all binlog to slave; waiting for binlog to be updated    Info: NULL *************************** 2. row ***************************      Id: 3    User: system user    Host:      db: NULL Command: Connect    Time: 1350 State: Waiting for master to send event    Info: NULL *************************** 3. row ***************************      Id: 4    User: system user    Host:      db: NULL Command: Connect    Time: 1149 State: Has read all relay log; waiting for the slave I/O thread to update it    Info: NULL *************************** 4. row ***************************      Id: 5    User: root    Host: localhost      db: test Command: Query    Time: 0   State: NULL    Info: show processlist 4 rows in set (0.00 sec) B： mysql> show processlist\G *************************** 1. row ***************************      Id: 1    User: system user    Host:      db: NULL Command: Connect    Time: 2130 State: Waiting for master to send event    Info: NULL *************************** 2. row ***************************      Id: 2    User: system user    Host:      db: NULL Command: Connect    Time: 1223 State: Has read all relay log; waiting for the slave I/O thread to update it    Info: NULL *************************** 3. row ***************************      Id: 4    User: root    Host: localhost      db: test Command: Query    Time: 0   State: NULL    Info: show processlist *************************** 4. row ***************************      Id: 5    User: repl2    Host: 192.168.0.231:50718      db: NULL Command: Binlog Dump    Time: 1398 State: Has sent all binlog to slave; waiting for binlog to be updated    Info: NULL 4 rows in set (0.00 sec) 如果红色部分没有出现，检查DATA目录下的错误文件。 8、释放掉各自的锁，然后进行插数据测试。 mysql> unlock tables; Query OK, 0 rows affected (0.00 sec) 插入之前两个机器表的对比： A： mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t11_innodb     | | t22            | +----------------+ B： mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t11_innodb     | | t22            | +----------------+ 从A机器上进行插入 A： mysql> create table t11_replicas     -> (id int not null auto_increment primary key,     -> str varchar(255) not null) engine myisam; Query OK, 0 rows affected (0.01 sec) mysql> insert into t11_replicas(str) values     -> ('This is a master to master test table'); Query OK, 1 row affected (0.01 sec) mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t11_innodb     | | t11_replicas   | | t22            | +----------------+ 3 rows in set (0.00 sec) mysql> select * from t11_replicas; +----+---------------------------------------+ | id | str                                   | +----+---------------------------------------+ |  1 | This is a master to master test table | +----+---------------------------------------+ 1 row in set (0.00 sec) 现在来看B机器： mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | t11_innodb     | | t11_replicas   | | t22            | +----------------+ 3 rows in set (0.00 sec) mysql> select * from t11_replicas; +----+---------------------------------------+ | id | str                                   | +----+---------------------------------------+ |  1 | This is a master to master test table | +----+---------------------------------------+ 1 row in set (0.00 sec) 现在反过来从B机器上插入数据： B： mysql> insert into t11_replicas(str) values('This is a test 2'); Query OK, 1 row affected (0.00 sec) mysql> select * from t11_replicas; +----+---------------------------------------+ | id | str                                   | +----+---------------------------------------+ |  1 | This is a master to master test table | |  2 | This is a test 2                      | +----+---------------------------------------+ 2 rows in set (0.00 sec) 我们来看A A： mysql> select * from t11_replicas; +----+---------------------------------------+ | id | str                                   | +----+---------------------------------------+ |  1 | This is a master to master test table | |  2 | This is a test 2                      | +----+---------------------------------------+ 2 rows in set (0.00 sec) 好了。现在两个表互相为MASTER。 多MASTER自增字段冲突的问题。 具体文章见： http://dev.mysql.com/tech-resources/articles/advanced-mysql-replication.html 在邮件列表中看到有人讨论在线同步与忽略库与表的问题，具体看： http://dev.mysql.com/doc/refman/5.1/en/replication-rules.html