mysql5.7.25主从复制(单向)

清疚 2022-03-15 08:56 258阅读 0赞

安装数据库：[https://blog.csdn.net/u010533511/article/details/88033637][https_blog.csdn.net_u010533511_article_details_88033637]

**Master配置**

1）my.cnf配置

vim /etc/my.cnf

\[mysqld\]  
log-bin=mysql-bin   //\[必须\]启用二进制日志  
server-id=139       //\[必须\]服务器唯一ID，默认是1，一般取IP最后一段

binlog-do-db=ztong  \#指定需要日志的数据库

binlog\_format= MIXED  \#binlog日志格式，mysql默认采用statement，建议使用mixed

slave\_skip\_errors = 1062   \#跳过主键冲突错误

2）重启mysql

service mysqld restart

3）在主服务器上建立帐户并授权slave

\#mysql –u root –p 123456   
mysql>GRANT REPLICATION SLAVE ON \*.\* to 'mysync'@'%' identified by '123456';  
 //一般不用root帐号，“%”表示所有客户端都可能连，只要帐号，密码正确，此处可用具体客户端IP代替，如192.168.135.139，加强安全。

4) 登录mysql，查询master的状态

mysql>show master status;

注：执行完此步骤后不要再操作主服务器MYSQL，防止主服务器状态值变化。

File: mysql-bin.000010    Position: 591 这两个值后面会用到

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**Slave配置**

1）my.cnf配置

vim /etc/my.cnf

\[mysqld\]  
log-bin=mysql-bin   //\[必须\]启用二进制日志  
server-id=141       //\[必须\]服务器唯一ID，默认是1，一般取IP最后一段

2）重启mysql

service mysql restart

3）配置从服务器Slave：

#数据库复制同步语句 master_log_file：对应master的file 
    #master_log_pos：是获master 的日志文件位置对应master 的position
    mysql> change master to master_host='192.168.135.139',master_port=3306,master_user='mysync',master_password='123456',master_log_file='mysql-bin.000010',master_log_pos=591;
    
    
    mysql> start slave;    //启动从服务器复制功能

4) 检查从服务器复制功能状态：  
mysql> show slave status\\G;

mysql> show slave status \G
    *************************** 1. row ***************************
                   Slave_IO_State: Waiting for master to send event
                      Master_Host: 192.168.135.139
                      Master_User: mysync
                      Master_Port: 3306
                    Connect_Retry: 60
                  Master_Log_File: mysql-bin.000010
              Read_Master_Log_Pos: 591 //在当前的主服务器二进制日志中,SLAVE中的I/O线程已经读取的位置
                   Relay_Log_File: localhost-relay-bin.000002
                    Relay_Log_Pos: 320 //在当前的中继日志中，SQL线程已读取和执行的位置
            Relay_Master_Log_File: mysql-bin.000010
                 Slave_IO_Running: Yes //I/O线程是否被启动并成功地连接到主服务器上
                Slave_SQL_Running: Yes //SQL线程是否被启动
                  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: 591
                  Relay_Log_Space: 531
                  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 //从服务器SQL线程和所属服务器I/O线程之间的时间差距,单位以秒计
    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: 139
                      Master_UUID: 383b83a3-3b1f-11e9-986d-000c295d359a
                 Master_Info_File: /data/mysql/master.info
                        SQL_Delay: 0
              SQL_Remaining_Delay: NULL
          Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
               Master_Retry_Count: 86400
                      Master_Bind: 
          Last_IO_Error_Timestamp: 
         Last_SQL_Error_Timestamp: 
                   Master_SSL_Crl: 
               Master_SSL_Crlpath: 
               Retrieved_Gtid_Set: 
                Executed_Gtid_Set: 
                    Auto_Position: 0
             Replicate_Rewrite_DB: 
                     Channel_Name: 
               Master_TLS_Version: 
    1 row in set (0.00 sec)

Slave\_IO\_Running: Yes       负责与主机的io通信

Slave\_SQL\_Running: Yes   负责自己的slave mysql进程

都是yes说明正常

测试：链接到数据库，创建数据库ztong  ，创建一个测试表

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA1MzM1MTE_size_16_color_FFFFFF_t_70][]

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如果需要重新配置从库

mysql> slave stop

mysql> change master to master\_host='192.168.135.139',master\_port=3306,master\_user='mysync',master\_password='123456',master\_log\_file='mysql-bin.000010',master\_log\_pos=591;  
mysql> start slave;

[https_blog.csdn.net_u010533511_article_details_88033637]: https://blog.csdn.net/u010533511/article/details/88033637
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTA1MzM1MTE_size_16_color_FFFFFF_t_70]: /images/20220315/93484c70a38044f8aafad07a27a08e3c.png