Mysql database master-slave cluster construction

1 preparation

• 1 Choose a server as the master server , Back up the data needed on the server

• 2 Install from library MySQL, It needs to be consistent with the version of the main server

• 3 Synchronize the data on the master server to the slave Library ( The master-slave cluster will only synchronize the data operations after the cluster is created , The original data will not be synchronized )

2 Configure the main database

Modify the configuration file

vim /etc/my.cnf

Add the configuration

[mysqld]
log-bin=mysql-bin
server-id=1

restart mysql service (centOS 7+)

systemctl restart mysqld

Use the command line to root User access MySQL

mysql -u root -p

Input password , Get into

Create a user with synchronization permission from the node

GRANT REPLICATION SLAVE ON *.* TO 'userName'@'%' IDENTIFIED BY 'yourPassword';

among userName Username ,yourPassword Is password

Refresh the permissions

FLUSH PRIVILEGES;

Query the main database status

show master status;

Record File 、Position Value of field

among File For operation log file ,Position Is the pointer position , These two fields are the key to data synchronization

3 Configure slave

Modify the configuration file

vim /etc/my.cnf

Add the configuration

[mysqld]
server-id=2

Be careful : Of every server server-id Can't repeat

restart mysql service (centOS 7+)

systemctl restart mysqld

Use the command line to root User access MySQL

mysql -u root -p

Input password , Get into

Execute synchronization statements

CHANGE MASTER TO MASTER_HOST='masterServerIp', MASTER_PORT=masterPort, MASTER_USER='masterUser', MASTER_PASSWORD='masterPassword', MASTER_LOG_FILE='masterLogFile', MASTER_LOG_POS=masterPosition;

among masterServerIp Main library server address (ip Or domain name )

masterPort Give priority to the library mysql port ( You need to ensure that the Internet is accessible )

masterUser For the user just created to synchronize data to the slave Library

masterPassword It is the user password just created for synchronizing data to the slave Library

masterLogFile Log file name of the main library , Corresponding fields File

masterPosition Main library pointer position , Corresponding fields Position

Start synchronization from the library

start slave;

Query the synchronization status of the slave Library

show slave status\G;

Mainly focus on fields : Slave_IO_Running,Slave_SQL_Running, The values of these two fields are Yes Then the slave library synchronization status is good

thus , The configuration of the master-slave cluster has been basically completed

4 Set a read-only user from the Library

Log in from library , Add read only users

GRANT SELECT ON *.* TO 'userName'@'%' IDENTIFIED BY 'yourPassword';

among userName User name for database ,yourPassword For the user password

Refresh the permissions

FLUSH PRIVILEGES;

Use a read-only user when connecting from the Library

5 Recommended references

MySQL Cluster deployment （ The use of multiple MySQL Example simulation ）

MySQL Master slave replication configuration