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SpringBoot+MyBatis+MySQL读写分离

开发技术 开发技术 3小时前 1次浏览

一、主从配置

1.环境

操作系统:CentOS-7

MySQL:mysql-5.7

192.168.15.129  master

192.168.15.130  slave

2.主库配置

  • vi /etc/my.cnf在[mysqld]下增加如下两行设置:

    [mysqld]
    log-bin=mysql-bin 
    server-id=1    
    
  • 创建数据同步账户

    CREATE USER 'repl'@'192.168.15.%' IDENTIFIED BY '666666';
    
    GRANT REPLICATION SLAVE ON *.* TO 'repl'@'192.168.15.%';
    
    FLUSH PRIVILEGES;
    
  • 查看matser状态: show master status;

3.从库配置

  • vi /etc/my.cnf

    [mysqld]
    log-bin=mysql-bin 
    server-id=2
    log-error=/var/log/mysqld.log   # 异常日志存放位置
    
  • 执行同步命令

    change master to master_host='192.168.15.129', master_user='repl', master_password='666666', master_log_file='mysql-bin.000002', master_log_pos=154;
    
    # 设置从库只读
    set global super_read_only=1;
    
    
    # 锁表
    flush tables with read lock;   # 锁表(所有角色都只读,但是会影响主从同步)
    
    # 解锁
    unlock tables;
    
  • 查看slave状态: show slave statusG;

4.异常解决

  • slave 在主库找不到binlog文件
[ERROR] Slave I/O for channel '': Got fatal error 1236 from master when reading data from binary log: 'Client requested master to start replication from position > file size', Error_code: 1236

解决方法:

  • master端
mysql> flush logs;
Query OK, 0 rows affected (0.02 sec)

mysql> show master status;
+---------------------+----------+--------------+------------------+-------------------+
| File                | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------------+----------+--------------+------------------+-------------------+
| dbmaster-bin.000005 |      120 |              |                  |                   |
+---------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

记住fileposition这两个选项

  • slave端
mysql> stop slave;
Query OK, 0 rows affected (0.01 sec)

mysql> change master to master_log_file ='dbmaster-bin.000005',master_log_pos=120;
Query OK, 0 rows affected (0.01 sec)

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

搞定收工!

二、读写分离

gitee源码地址:https://gitee.com/kk-dad/msrepl


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