系統環境：CENTOS7

MYSQL版本，status;第一行，mysql  Ver 14.14 Distrib 5.7.22, for linux-glibc2.12 (x86_64) using  EditLine wrapper

主庫：192.168.156.75

從庫：192.168.156.73

1、主庫操作：

修改/etc/my.cnf，新增如下內容：

log-bin = mysql-bin

server-id =1

innodb-file-per-table =ON

skip_name_resolve=ON

重啟mysql服務

主庫上面建立並授權同步的使用者：

mysql> grant replication slave,replication client on *.* to 'repluser'@'192.168.156.73' identified by 'yourpassword';

Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

在主庫上面查得當前的BINLOG檔案及Position，在從庫上要同步要用到

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 |     626 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

2、從庫操作：

修改/etc/my.cnf

新增如下內容，開啟中繼日誌

relay-log=relay-log

relay-log-index=relay-log.index

server-id=2

innodb_file_per_table=ON

skip_name_resolve=ON

重啟mysql服務

在從庫上配置同步

mysql> CHANGE MASTER TO MASTER_HOST='192.168.156.75',MASTER_USER='repluser',MASTER_PASSWORD='yourpassword', MASTER_LOG_FILE='mysql-bin.000003',MASTER_LOG_POS=626;
ERROR 3021 (HY000): This operation cannot be performed with a running slave io thread; run STOP SLAVE IO_THREAD FOR CHANNEL '' first.
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)

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

mysql> show slave status;
+----------------------------------+----------------+-------------+-------------+---------------+------------------+---------------------+------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+--------------------------------------+-----------------------------------+-----------+---------------------+--------------------------------------------------------+--------------------+-------------+-------------------------+--------------------------+----------------+--------------------+--------------------+-------------------+---------------+----------------------+--------------+--------------------+
| Slave_IO_State                   | Master_Host    | Master_User | Master_Port | Connect_Retry | Master_Log_File  | Read_Master_Log_Pos | Relay_Log_File   | Relay_Log_Pos | Relay_Master_Log_File | Slave_IO_Running | Slave_SQL_Running | Replicate_Do_DB | Replicate_Ignore_DB | Replicate_Do_Table | Replicate_Ignore_Table | Replicate_Wild_Do_Table | Replicate_Wild_Ignore_Table | Last_Errno | Last_Error | Skip_Counter | Exec_Master_Log_Pos | Relay_Log_Space | Until_Condition | Until_Log_File | Until_Log_Pos | Master_SSL_Allowed | Master_SSL_CA_File | Master_SSL_CA_Path | Master_SSL_Cert | Master_SSL_Cipher | Master_SSL_Key | Seconds_Behind_Master | Master_SSL_Verify_Server_Cert | Last_IO_Errno | Last_IO_Error | Last_SQL_Errno | Last_SQL_Error | Replicate_Ignore_Server_Ids | Master_Server_Id | Master_UUID                          | Master_Info_File                  | SQL_Delay | SQL_Remaining_Delay | Slave_SQL_Running_State                                | Master_Retry_Count | Master_Bind | Last_IO_Error_Timestamp | Last_SQL_Error_Timestamp | Master_SSL_Crl | Master_SSL_Crlpath | Retrieved_Gtid_Set | Executed_Gtid_Set | Auto_Position | Replicate_Rewrite_DB | Channel_Name | Master_TLS_Version |
+----------------------------------+----------------+-------------+-------------+---------------+------------------+---------------------+------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+--------------------------------------+-----------------------------------+-----------+---------------------+--------------------------------------------------------+--------------------+-------------+-------------------------+--------------------------+----------------+--------------------+--------------------+-------------------+---------------+----------------------+--------------+--------------------+
| Waiting for master to send event | 192.168.156.75 | repluser    |        3306 |            60 | mysql-bin.000003 |                 626 | relay-log.000010 |           320 | mysql-bin.000003      | Yes              | Yes               |                 |                     |                    |                        |                         |                             |          0 |            |            0 |                 626 |            1206 | None            |                |             0 | No                 |                    |                    |                 |                   |                |                     0 | No                            |             0 |               |              0 |                |                             |                1 | 731ddd80-d725-11e8-949c-000c29efe4dc | /usr/local/mysql/data/master.info |         0 |                NULL | Slave has read all relay log; waiting for more updates |              86400 |             |                         |                          |                |                    |                    |                   |             0 |                      |              |                    |
+----------------------------------+----------------+-------------+-------------+---------------+------------------+---------------------+------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+-------------------------------+---------------+---------------+----------------+----------------+-----------------------------+------------------+--------------------------------------+-----------------------------------+-----------+---------------------+--------------------------------------------------------+--------------------+-------------+-------------------------+--------------------------+----------------+--------------------+--------------------+-------------------+---------------+----------------------+--------------+--------------------+
1 row in set (0.00 sec)
 

限制從庫只讀：

mysql> FLUSH TABLES WITH READ LOCK;
Query OK, 0 rows affected (0.00 sec)

3、此時再驗證，在主庫上面建立資料庫和表，看看從庫上面是不是馬上同步過來