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 10 (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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