做主从复制实验：
第一步：主服务器上操作
1、修改主服务器master:
[root@localhost ~]# vim /etc/my.cnf server_id = 1 //[必须]服务器唯一ID，默认是1 log-bin=mysql-bin //[必须]启用二进制日志
2、重启主数据库
[root@localhost ~]# systemctl restart mysqld
3、在主服务器上建立帐户并授权slave:
mysql> grant replication slave on *.* to 'zhangsan'@'%' identified by '123456'; Query OK, 0 rows affected (0.00 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)
4、登录主服务器的mysql，查询master的状态
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 401 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
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
第二步：从服务器操作
1、修改从服务器slave:
[root@localhost ~]# vim /etc/my.cnf server_id = 2 log-bin=mysql-bin
2、重启从数据库
[root@localhost ~]# systemctl restart mysqld
3、配置从服务器Slave：
mysql> change master to master_host='192.168.35.131',master_user='zhangsan',master_password='123456', master_log_file='mysql-bin.000001',master_log_pos=401; Query OK, 0 rows affected, 2 warnings (0.02 sec) mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)
4、启动从服务器复制功能并检查从服务器复制功能状态
mysql> start slave;
Query OK, 0 rows affected (0.13 sec)
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.35.131 //主服务器地址
Master_User: zhangsan //授权帐户名，尽量避免使用root
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 401 //#同步读取二进制日志的位置，大于等于Exec_Master_Log_Pos
Relay_Log_File: localhost-relay-bin.000002
Relay_Log_Pos: 283
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes //此状态必须YES
Slave_SQL_Running: Yes //此状态必须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: 401
Relay_Log_Space: 460
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: 31f8646b-484e-11e8-b503-000c298f5b19
Master_Info_File: /data/mysqldb/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
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
1 row in set (0.00 sec)
ERROR:
No query specified
注：Slave_IO及Slave_SQL进程必须正常运行，即YES状态，否则都是错误的状态(如：其中一个NO均属错误)。
第三步：检测主从配置
1、在主数据库中创建一个库data，查看从库中是否有
主库中：
mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | test | +--------------------+ 4 rows in set (0.00 sec) mysql> create database data; Query OK, 1 row affected (0.00 sec) mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | data | | mysql | | performance_schema | | test | +--------------------+ 5 rows in set (0.00 sec)
2、从库中查看：
mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | data | | mysql | | performance_schema | | test | +--------------------+ 5 rows in set (0.00 sec)
能够看到从库中是有data库的，说明主从复制配置完成，但是要注意，从表里不能做更新，删除等操作，只能使用查询，所以要慎重。
总结：完成以上操作过程，主从服务器配置完成。