Mysql 主从同步

Mysql 主从同步

主：192.168.10.17

从：192.168.10.20

一、先修改主库的/etc/mysql/my.cnf

log-bin=mysql-bin #slave会基于此log-bin来做replication  
server-id=1       #master的标示 不能重复
innodb_flush_log_at_trx_commit=2
sync_binlog=1     

 修改从库/etc/mysql/my.cnf

server-id=2       #slave的标示 不能重复

 分别重启两个数据库服务

sudo serivice mysql restart

 

二、创建主从复制的用户及相应的权限

mysql> GRANT REPLICATION SLAVE ON *.* to 'nothing'@'192.168.10.20' identified by '123456';

 主库 查看主数据库状态

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      106 |              |                  |
+------------------+----------+--------------+------------------+

 从库设置并启动主从机制

mysql> change master to master_host='192.168.10.31',
    -> master_user='nothing',
    -> master_password='123456',
    -> master_log_file='mysql-bin.000001',
    -> master_log_pos=106;
Query OK, 0 rows affected (0.02 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

从库查看启动状态

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.10.17
                  Master_User: nothing
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 264
               Relay_Log_File: ubuntu-relay-bin.000002
                Relay_Log_Pos: 409
        Relay_Master_Log_File: mysql-bin.000001
             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: 264
              Relay_Log_Space: 565
              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: 
1 row in set (0.00 sec)

 当出现以上状态时表示成功！如果不成功！后半段会报出相应的错误！ 这时在主库创建的库、表、数据全部会自动同步到从库。

 几点注意事项：

1. 从库的有户连不上时注意主库中的账户的Host字段地址
2. 注意/etc/mysql/my.cnf中 #bind-address  = 127.0.0.1 注释掉，不然不能远程连。可以在从库服务器上用 mysql -h 192.168.10.17 -unothing -p123456来测试创建的用户是否可以连接上。

先到这里！ 有问题欢迎留言！