mysql数据库互为主从配置(二)

mysql数据库互为主从配置

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:

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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:

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FLUSH PRIVILEGES;


1)配置A-C互为主从

修改A配置文件为:

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server-id   = 1
replicate- do -db=test
replicate- do -db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild- do -table=test.%
replicate-wild- do -table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all


修改C配置文件为:

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server-id   = 3
binlog- do -db=test
binlog- do -db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild- do -table=test.%
replicate-wild- do -table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all


重启mysql是配置生效

将A设置为主:
停止同步:

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slave stop;

清空服务器master日志:

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reset master;


授权同步账号:

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


刷新授权:

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flush privileges;

 
锁定数据库:

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flush tables with read lock ;

 
将C设置为从:
停止同步:

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slave stop;

 
配置同步信息:

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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:

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slave stop;


清空服务器master日志:

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reset master;

 
授权同步账号:

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

 
刷新授权:

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flush privileges;


锁定数据库:

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flush tables with read lock ;

 
将A设置为从:
停止同步:

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slave stop;

 
配置同步信息:

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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

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server-id   = 2
replicate- do -db=test
replicate- do -db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild- do -table=test.%
replicate-wild- do -table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all

 

重启mysql服务

停止同步:

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slave stop;

 
配置同步信息:

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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:

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slave start;

 
3)将D设置为C的从

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server-id   = 4
replicate- do -db=test
replicate- do -db=test_admin
log-bin=mysql-bin
log-slave-updates
replicate-wild- do -table=test.%
replicate-wild- do -table=test_admin.%
binlog-ignore-db=mysql
slave-skip-errors=all

 
重启mysql服务

停止同步:

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slave stop;

 
配置同步信息:

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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:

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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:

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1)
change master导致的:
               Last_IO_Error: error connecting to master 'repl1@IP:3306'  - retry-time: 60  retries
 
2)   
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 transaction
 
3)
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 master
mysql> 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 first
 
 
5)
A B的server-id相同:
Last_IO_Error: Fatal error: The slave I/O thread stops 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 on
slave but this  does not always make sense; please check the manual before using  it).
查看server-id
mysql> show variables like 'server_id' ;
手动修改server-id
mysql> 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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