mysql数据库互为主从配置_MySQL

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mysql主从配置小记：

共有四台机器：A(10.1.10.28),B(10.1.10.29),C(10.1.10.30),D(10.1.10.31)。
配置后结果：A-C互为主从，B为A的slave，D为C的slave。


0)准备工作

在四台机器上面安装好mysql后，创建用于同步的账号。

添加账户：

INSERT INTO user (Host,User, Password,Select_priv,Insert_priv,Update_priv,Delete_priv, Create_priv,Drop_priv) VALUES('%','test',password('test'),'Y','Y','Y','Y','Y','Y');

刷新数据库：

FLUSH PRIVILEGES;

1)配置A-C互为主从

修改A配置文件为：

server-id   = 1replicate-do-db=testreplicate-do-db=test_adminlog-bin=mysql-binlog-slave-updatesreplicate-wild-do-table=test.%replicate-wild-do-table=test_admin.%binlog-ignore-db=mysqlslave-skip-errors=all

修改C配置文件为：

server-id   = 3binlog-do-db=testbinlog-do-db=test_adminlog-bin=mysql-binlog-slave-updatesreplicate-wild-do-table=test.%replicate-wild-do-table=test_admin.%binlog-ignore-db=mysqlslave-skip-errors=all

重启mysql是配置生效

将A设置为主：
停止同步：

slave stop;

清空服务器master日志：

reset master;

授权同步账号：

GRANT REPLICATION SLAVE ON *.* TO 'test'@'%' IDENTIFIED BY 'test'；

刷新授权:

FLUSH PRIVILEGES;

锁定数据库:

flush tables with read lock;

将C设置为从：
停止同步：

slave stop;

配置同步信息：

CHANGE MASTER TO MASTER_HOST='10.1.10.28', MASTER_USER='test', MASTER_PASSWORD='test', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=107;

将C设置为主：
停止同步：

slave stop;

清空服务器master日志：

reset master;

授权同步账号：

GRANT REPLICATION SLAVE ON *.* TO 'test'@'%' IDENTIFIED BY 'test'；

刷新授权:

FLUSH PRIVILEGES;

锁定数据库:

flush tables with read lock;

将A设置为从：
停止同步：

slave stop;

配置同步信息：

CHANGE MASTER TO MASTER_HOST='10.1.10.30', MASTER_USER='test', MASTER_PASSWORD='test', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=107;

2)将B设置为A的从

server-id   = 2replicate-do-db=testreplicate-do-db=test_adminlog-bin=mysql-binlog-slave-updatesreplicate-wild-do-table=test.%replicate-wild-do-table=test_admin.%binlog-ignore-db=mysqlslave-skip-errors=all

重启mysql服务

停止同步：

slave stop;

配置同步信息：

CHANGE MASTER TO MASTER_HOST='10.1.10.28', MASTER_USER='test', MASTER_PASSWORD='test', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=107;

启动同步:

slave start;

3)将D设置为C的从

server-id   = 4replicate-do-db=testreplicate-do-db=test_adminlog-bin=mysql-binlog-slave-updatesreplicate-wild-do-table=test.%replicate-wild-do-table=test_admin.%binlog-ignore-db=mysqlslave-skip-errors=all

重启mysql服务

停止同步：

slave stop;

配置同步信息：

CHANGE MASTER TO MASTER_HOST='10.1.10.30', MASTER_USER='test', MASTER_PASSWORD='test', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=107;

启动同步:

slave start;

完成之后可以创建添加数据测试一下是否可以。

下面是常见错误处理：

1）change master导致的：              Last_IO_Error: error connecting to master 'repl1@IP:3306' - retry-time: 60  retries2）    在没有解锁的情况下停止slave进程：     mysql> stop slave;ERROR 1192 (HY000): Can't execute the given command because you have active locked tables or an active transaction3）change master语法错误，落下逗号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）在没有停止slave进程的情况下change mastermysql> 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 first5）A B的server-id相同：Last_IO_Error: Fatal error: The slave I/O thread stophotoshop/ target=_blank class=infotextkey>ps 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 onslave but this does not always make sense; please check the manual before using it).查看server-idmysql> show variables like 'server_id';手动修改server-idmysql> set global server_id=2; #此处的数值和my.cnf里设置的一样就行mysql> slave start;6）change master之后，查看slave的状态，发现slave_IO_running 为NO

 

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