MySQL5.7主、从配置具体步骤：

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1.两台MySQL服务器

主：192.168.253.138 端口：1221

从：192.168.253.139 端口：1221

2.修改主从配置参数

2.1 主服务器

##添加入下内容

vi /etc/my.cnf

[mysqld]

log-bin = mysql-bin ##必须启用二进制格式日志

server-id=138 ##server-id必须唯一，一般为IP的尾数

2.2 从服务器

##添加入下内容

vi /etc/my.cnf

[mysqld]

log-bin = mysql-bin ##启用二进制格式日志，可选配置

server-id=139 ##server-id必须唯一，一般为IP的尾数

3.重启主、从服务器使修改生效

主服务器（138）

[root@my01 ~]# service mysql restart

Shutting down MySQL.. SUCCESS!

Starting MySQL. SUCCESS!

从服务器（139）

[root@my02 ~]# service mysql restart

Shutting down MySQL.. SUCCESS!

Starting MySQL. SUCCESS!

4.在主服务器上创建复制账号并授权slave

[root@my01 ~]# mysql -uroot -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 5

Server version: 5.7.19-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> grant replication slave on *.* to 'mysync'@'%' identified by 'mysql123';

Query OK, 0 rows affected, 1 warning (0.02 sec)

mysql>

5.查看主服务器状态

##记录File与Position的值，配置从服务器时使用，之后主服务器就不要做任何操作了，避免值的改变使得从服务器配置失败

mysql> show master status;

+------------------+----------+--------------+------------------+-------------------+

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

+------------------+----------+--------------+------------------+-------------------+

| mysql-bin.000001 | 1306 | | | |

+------------------+----------+--------------+------------------+-------------------+

1 row in set (0.00 sec)

6.配置、启动从服务器

[root@my02 ~]# mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 7

Server version: 5.7.19-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

mysql> CHANGE MASTER TO MASTER_HOST='192.168.253.138', MASTER_PORT=1221, MASTER_USER='mysync', MASTER_PASSWORD='mysql123', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=1306;

Query OK, 0 rows affected, 2 warnings (0.01 sec)

mysql> start slave;

Query OK, 0 rows affected (0.01 sec)

7.查看从服务器复制状态

##最主要的是查看Slave_IO_Running: Yes，Slave_SQL_Running: Yes 这两项是不是YES，是则代表主从配置成功，否则失败

mysql> show slave status\G

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 192.168.253.138

Master_User: mysync

Master_Port: 1221

Connect_Retry: 60

Master_Log_File: mysql-bin.000001

Read_Master_Log_Pos: 1306

Relay_Log_File: my02-relay-bin.000003

Relay_Log_Pos: 320

Relay_Master_Log_File: mysql-bin.000001

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: 1306

Relay_Log_Space: 526

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: 138

Master_UUID: dfb01359-857f-11e7-8ed4-000c2997411c

Master_Info_File: /data/db/mysql/1221/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)

mysql>

8.测试主、从情况

##主服务器

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| mysql |

| performance_schema |

| sys |

+--------------------+

4 rows in set (0.01 sec)

mysql> create database test;

Query OK, 1 row affected (0.02 sec)

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| mysql |

| performance_schema |

| sys |

| test |

+--------------------+

5 rows in set (0.00 sec)

mysql> use test;

Database changed

mysql> show tables;

Empty set (0.00 sec)

mysql> create table t(id int,name varchar(10));

Query OK, 0 rows affected (0.04 sec)

mysql> insert into t values (1,"zhang san");

Query OK, 1 row affected (0.07 sec)

mysql> show tables;

+----------------+

| Tables_in_test |

+----------------+

| t |

+----------------+

1 row in set (0.00 sec)

mysql> select * from

-> t;

+------+-----------+

| id | name |

+------+-----------+

| 1 | zhang san |

+------+-----------+

1 row in set (0.00 sec)

mysql> insert into t values (2,"li si");

Query OK, 1 row affected (0.01 sec)

mysql>

###从服务器

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| mysql |

| performance_schema |

| sys |

| test |

+--------------------+

5 rows in set (0.00 sec)

mysql> use test;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> show tables;

+----------------+

| Tables_in_test |

+----------------+

| t |

+----------------+

1 row in set (0.00 sec)

mysql> select * from t;

+------+-----------+

| id | name |

+------+-----------+

| 1 | zhang san |

| 2 | li si |

+------+-----------+

2 rows in set (0.00 sec)

mysql>

####恭喜成功了！！！

##注意：主服务器权限配置，如下：

mysql> update user set user.Host='%' where user.User='root';

Query OK, 1 row affected (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 0

mysql> flush privileges;

Query OK, 0 rows affected (0.01 sec)

###此配置保证其它服务器能够连接到主服务器，否则后面的从服务器配置复制时会失败！！！