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  • MySQL主从复制


     
    原理:利用mysql二进制日志文件,实现数据同步
     
    步骤:
     
    一、配置主库(Master)
     
    1. 修改主库my.cnf配置文件,加入如下配置
    [root@localhost ~]# nano -w /etc/my.cnf
     
    [mysqld] log-bin=mysql-bin server-id=1
     
    2. 重启mysql,使配置生效
    [root@localhost ~]# service mysqld restart
     
    3. 以root登录mysql,创建主从复制用户并授权主从复制
    [root@localhost ~]# mysql -uroot -p
     
    mysql> CREATE USER 'repl'@'%' IDENTIFIED BY 'repl_password';
    mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%';
    mysql> FLUSH PRIVILEGES;
     
    4. 查看主库二进制日志坐标(记住File和Position列对应的值)
    mysql> SHOW MASTER STATUS;
    +------------------+----------+--------------+------------------+
    | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
    +------------------+----------+--------------+------------------+
    | mysql-bin.000001 | 747      |              |                  |
    +------------------+----------+--------------+------------------+
     
     
    二、配置从库(Slave)
     
    1. 修改从库my.cnf配置文件,加入如下配置
    [root@localhost ~]# nano -w /etc/my.cnf
     
    [mysqld] server-id=2
     
    2. 修改MySQL server UUID(可选,如果是直接克隆虚拟机,则这步必须做)
    mv /var/lib/mysql/auto.cnf /var/lib/mysql/auto.cnf.bak
     
    3. 重启mysql,使配置生效并生成新的MySQL server UUID
    [root@localhost ~]# service mysqld restart
     
    4. 以root登录mysql,并设置从库访问主库二进制日志文件
    [root@localhost ~]# mysql -uroot -p
    mysql> CHANGE MASTER TO
        ->    MASTER_HOST='master_host_name',
        ->    MASTER_USER='repl',
        ->    MASTER_PASSWORD='repl_password',
        ->    MASTER_LOG_FILE='mysql-bin.000001',
        ->    MASTER_LOG_POS=747;
     
    5. 启动Slave
    mysql> start slave;
     
    6. 查看Slave连接状态(Slave_IO_Running、Slave_SQL_Running都为Yes则表示连接成功)
    mysql> show slave status G;
     
    *************************** 1. row ***************************
      Slave_IO_State: Waiting for master to send event
      Master_Host: 192.168.168.110
      Master_User: repl
      Master_Port: 3306
      Connect_Retry: 60
      Master_Log_File: mysql-bin.000001
      Read_Master_Log_Pos: 747
      Relay_Log_File: localhost-relay-bin.000002
      Relay_Log_Pos: 320
      Relay_Master_Log_File: mysql-bin.000001
      Slave_IO_Running: Yes
      Slave_SQL_Running: Yes
     
     
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  • 原文地址:https://www.cnblogs.com/gdufs/p/7147983.html
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