centos7上mysql5.7配置主从数据库

这里我直接用的root账号做测试，非root账号以后再测试。

Mysql主从配置笔记，安装完成两个Mysql，版本都是5.7.21。

1.两个服务器MySql全部关闭
1).配置my.cnf文件:
主:
[mysqld]
log-bin=mysql-bin
server-id=1
从:
[mysqld]
server-id=2

注解:server-id必须唯一。如果默认为0，则拒绝连接主服务器.

2.主:
1).启动master的Mysql服务

2).创建用户,让slave服务器用来连接用

grant replication slave on *.* to 'root'@'%';

例如:
CREATE USER ‘qfmyy’@’192.168.133.%’ IDENTIFIED BY ‘Langman082522’;
GRANT REPLICATION SLAVE ON . TO ‘qfmyy’@’192.168.133.%’;

IP地址可用*表示,用以所有ip都可以连接

3).获取日志坐标

查看日志坐标

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 |      350 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+

记住上面两个字段数值

3.从:

重启从库的mysql

在从库进行连接主库执行如下sql：

mysql> change master to master_host='39.108.63.238', master_user='root', master_password='466465570',master_log_file='mysql-bin.000003',master_log_pos=350;

在从库执行：

mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)

成功

mysql> show slave status \G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: ****
                  Master_User: root
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 527
               Relay_Log_File: lry_slave-relay-bin.000002
                Relay_Log_Pos: 497
        Relay_Master_Log_File: mysql-bin.000003
             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: 527
              Relay_Log_Space: 708
              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: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
                  Master_UUID: f140ff80-fa62-11e7-b3de-00163e04a9f8
             Master_Info_File: /var/lib/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)

ERROR: 
No query specified

到这里，全部库的主从配置就完成了，实际应用中可能会用到单个表的同步，或者部分表的同步，只需要在主库的/etc/my.cnf里加上

只复制某个表replicate-do-table=tablename
只复制某些表（可用匹配符）replicate-wild-do-table=tablename%
只复制某个库replicate-do-db=dbname
只复制某些库replicte-wild-do-db=dbname%
不复制某个表replicate-ignore-table=tablename
配置就可以了

centos7上mysql5.7配置主从数据库

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