MySQL主主循环同步.doc

MYSQL MASTERMASTER主主循环同步仲伟成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TEST1、环境描述。 主机：51（A） 主机：53（B） MYSQL 版本为5.1.542、授权用户。A：mysql grant replication slave,file on *.* to repl153 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 repl251 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f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=alllower_case_table_names=1binlog_format=rowsync_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=alllower_case_table_names=1binlog_format=rowsync_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 。蓝色部分是忽略表名大小写的区分;后者用于以后实时同步到Oracle库中的日志格式4、重新启动MYSQL服务器。在A和B上执行相同的步骤rootlocalhost # /usr/local/mysql/bin/mysqld_safe &1 4264rootlocalhost # 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=53, - 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=51, - 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 processlistG* 1. row * Id: 2 User: repl Host: 53:54475 db: NULLCommand: 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: NULLCommand: Connect Time: 1350 State: Waiting for master to send event Info: NULL* 3. row * Id: 4 User: system user Host: db: NULLCommand: 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: testCommand: Query Time: 0 State: NULL Info: show processlist4 rows in set (0.00 sec)B：mysql show processlistG* 1. row * Id: 1 User: system user Host: db: NULLCommand: Connect Time: 2130 State: Waiting for master to send event Info: NULL* 2. row * Id: 2 User: system user Host: db: NULLCommand: 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: testCommand: Query Time: 0 State: NULL Info: show processlist* 4. row * Id: 5 User: repl2 Host: 51:50718 db: NULLCommand: Binlog Dump Time: 1398 State: Has sent all binlog to slave; waiting for binlog to be updated Info: NULL4 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