mysql开启主从复制

第一步：开启所有MYSQL服务器的BIN日志，每台服务器设置一个唯一的server-id的值(默认是1，一般取IP最后一段)

修改主服务器(master)的my.cnf

[mysqld]
log-bin=mysql-bin
server-id=91

修改从服务器(slave)的my.cnf

[mysqld]
log-bin=mysql-bin
server-id=92

第二步：重启主和从服务器

service mysqld restart

第三步：在主服务器上创建一个用来同步数据的帐号(如下边的test_slave，%表示所有客户端都可能连)

GRANT replication slave ON *.* TO ‘test_slave‘@‘%‘ IDENTIFIED BY ‘123456‘;

第四步：登录主服务器的mysql，查询master的状态

show master status

见到如下所示

+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000025 |      700 |              |                  |
+------------------+----------+--------------+------------------+

第五步：配置从服务器状态

stop slave;

change master to
master_host=‘192.168.1.91‘,
master_user=‘test_slave‘,
master_password=‘123456‘,
master_log_file=‘mysql-bin.000025‘,
master_log_pos=700;

start slave;

解释：
MASTER_HOST=‘主服务器的IP地址‘,
MASTER_USER=‘主服务器上用于同步数据的账号‘,
MASTER_PASSWORD=‘同步的账号的密码‘,
MASTER_LOG_FILE=‘bin日志的文件名‘,
MASTER_LOG_POS=bin日志中的position的值;

第六步：查看从服务器状态

show slave status\G

出现

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.91
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000025
          Read_Master_Log_Pos: 700
               Relay_Log_File: bogon-relay-bin.000002
                Relay_Log_Pos: 342
        Relay_Master_Log_File: mysql-bin.000025
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 700
              Relay_Log_Space: 498
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 1
1 row in set (0.00 sec)

如果Slave_IO_Running: Yes Slave_SQL_Running: Yes代表成功
一般出现这句Slave_IO_State: Waiting for master to send event 也代表成功