centos7上mysql5.7配置主從數據庫

這裏我直接用的root賬號做測試，非root賬號以後再測試。

Mysql主從配置筆記，安裝完成兩個Mysql，版本都是5.7.21。

1.兩個服務器MySql全部關閉 
1).配置my.cnf文件: 
主: 
[mysqld] 
log-bin=mysql-bin 
server-id=1 
從: 
[mysqld] 
server-id=2 

註解:server-id必須唯一。如果默認爲0，則拒絕連接主服務器.

2.主: 
1).啓動master的Mysql服務 

2).創建用戶,讓slave服務器用來連接用

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都可以連接

3).獲取日誌座標

查看日誌座標

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

記住上面兩個字段數值

3.從:

重啓從庫的mysql

在從庫進行連接主庫執行如下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;

在從庫執行：

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

到這裏，全部庫的主從配置就完成了，實際應用中可能會用到單個表的同步，或者部分表的同步，只需要在主庫的/etc/my.cnf里加上

只複製某個表replicate-do-table=tablename 
只複製某些表（可用匹配符）replicate-wild-do-table=tablename% 
只複製某個庫replicate-do-db=dbname 
只複製某些庫replicte-wild-do-db=dbname% 
不復制某個表replicate-ignore-table=tablename
配置就可以了