MySQL master-slave synchronization configuration

　　The master-slave replication function provided by the MySQL database itself can easily realize the automatic backup of data in multiple places and realize the expansion of the database. Multiple data backups can not only enhance data security, but also further improve the load performance of the database by implementing read-write separation.

　　The following figure shows the working principle of MySQL master-slave replication

　　MySQL master-slave replication configuration steps

　　First, the main modification configuration file opens bin-log

[mysqld]
log-bin         = /var/lib/mysql/bin-log
server-id       = 3307

　　Second, set the server-id from the modified configuration file (not the same as the main id)

[mysqld]
server-id       = 3308

　　Third, the main master backup database

mysqldump -uroot -p123456 -h 192.168.0.12 -P 3307 -A --master-data=1 >backup.sql

　　-P specifies the port

　　-A backup all

　　Fourth, import from the slave backup database

mysql -uroot -p123456 -h 192.168.0.12 -P3307 < backup.sql

　　5. Log in to the main MySQL and set the synchronization user

grant replication slave on *.* to repl@'%' identified by 'repl';
flush privileges;

　　Sixth, check the main bin-log file and the POS location of the bin-log

show master status;

　　Seven, log in from the configuration synchronization

mysql> stop slave;
mysql> CHANGE MASTER TO
-> MASTER_HOST='192.168.0.12',
-> MASTER_USER='repl',
-> MASTER_PASSWORD='repl',
-> MASTER_PORT=3307
-> MASTER_LOG_FILE='bin-log.000001',
-> MASTER_LOG_POS=890;
mysql> start slave;

　　View sync status

show slave status\G

　　The communication process between the IO process master and the slave is YES on behalf of normal

　　The SQL process executes the process for the binary file synchronized from the main YES means normal

 

　　Create a test database test on the main

create database test;

　　It can be seen from above

 

　　In order to avoid data asynchrony, the slave server can be set to start read-only in production, and all write operations are performed on the master.