mysql5.7.25主从复制(单向)

安装数据库：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;

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000010 |      591 | ztong        |                  |                   |

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

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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;