Simple configuration of MySQL master-slave synchronization

1. The virtual machine system CentOS7, mysql uses mariadb.
2. The main database 192.168.1.7, the secondary database 192.168.1.8.
3. Make sure that port 3306 of the virtual machine firewall is enabled.
4. For beginners, there are still many configuration items I haven't studied in depth, this article is for reference only.

One, the main database

1. Create User

GRANT REPLICATION SLAVE ON *.* TO 'voyager'@'192.168.1.%' IDENTIFIED BY '123';
Username: voyager, password: 123, allowed access ip 192.168.1.% (according to itself)

2. Create two databases

CREATE DATABASE voyager1;
CREATE DATABASE voyager2;
Mainly to illustrate the synchronization of multiple databases.

3. Modify the configuration

vim /etc/mysql/my.cnf

[mysqld]
server-id=7 
log-bin=log
binlog-do-db=voyager1 
binlog-do-db=voyager2
binlog-ignore-db=mysql

##新增, 还没研究
//binlog-format=row // 
//bind-address=0.0.0.0// 
//relay-log// 

systemctl restart mariadb

4. Check status

show master status;

+------------+----------+-------------------+------------------+
| File       | Position | Binlog_Do_DB      | Binlog_Ignore_DB |
+------------+----------+-------------------+------------------+
| log.000001 |      245 | voyager1,voyager2 | mysql            |
+------------+----------+-------------------+------------------+

Remember the values ​​of File and Position .

Second, from the database

1. Create a database

Based on the top to create the database voyager1, voyager2.

2. Modify the configuration

1. Add server-id

   vim /etc/my.cnf

   [mysqld]
   server-id=8 
   

   systemctl restart mariadb

2. Add master database information

   1. stop slave ;
   2. change master to master_host='192.168.1.7', master_user='voyager', master_password='123', master_port=3306, master_log_file='log.000001', master_log_pos=245;Here the last two parameters to File and Position values
   3. start slave ;

3. View status

show slave status\G

*************************** 1. row ***************************
              Slave_IO_State: Waiting for master to send event
                 Master_Host: 192.168.1.7
                 Master_User: voyager
                 Master_Port: 3306
               Connect_Retry: 60
             Master_Log_File: log.000001
         Read_Master_Log_Pos: 597
              Relay_Log_File: mariadb-relay-bin.000004
               Relay_Log_Pos: 523
       Relay_Master_Log_File: log.000001
            Slave_IO_Running: Yes
           Slave_SQL_Running: Yes

At this time, seeing two kind Yes means success.
Then go to the main database to create a table, and check it out from the database!