In kuborad graphical interface, operate kubernetes cluster to realize master-slave replication in MySQL

mysql Master-slave replication in

1： Description of master-slave replication

When the system concurrency is very large , Generally need mysql Master-slave replication of , hold mysql Divided into multiple services ,master Copy write operation ,slaver Responsible for reading operation .

2： The principle of replication

The original copy is from the server binlog, Log of binary operations , It is also the main scheme of database recovery

3: Set up the master server

because The slave server needs to read from the master server binlog attribute . Therefore, it is necessary to set the details of multiple master servers

[mysqld] 
server_id  = 1 
character-set-server=utf8mb4 
collation-server=utf8mb4_general_ci 
log-bin=/var/lib/mysql/binlog 

By looking at mysql Image of the container , Find out mysql The path of the core configuration file in the back left
/etc/mysql/mysql.conf.d/mysqld.cnf4.

4: Set up slave server

The configuration of the slave server is almost the same as that of the master server . stay k8s Middle configuration , Pay attention to various naming .
The configuration file is as follows ：

[mysqld] 
server_id  = 2 
character-set-server=utf8mb4 
collation-server=utf8mb4_general_ci 

Compared with the previous configuration of the master server

• server_id change
• period log-bin

5 : Check the main server status

Because the default is the primary server binlog Copy to slave server , So first use the following command to check show master status;
The results are as follows ：
mysql> show master status;
±--------------±---------±-------------±-----------------±------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
±--------------±---------±-------------±-----------------±------------------+
| binlog.000008 | 154 | | | |
±--------------±---------±-------------±-----------------±------------------+
1 row in set (0.03 sec)
Use the following command to connect the slave server to the master server

CHANGE MASTER TO MASTER_HOST='jd-nysql1', 
	MASTER_PORT=3306, MASTER_USER='root',
	MASTER_PASSWORD='password', 
	MASTER_LOG_FILE='binlog.000008', 
	MASTER_LOG_POS=154;

Note that the command configuration here should be consistent with that of the main server

Then enter the slave server , Execute the above command , If there is no error prompt , That means success

6: Start from server

Although the last step has , But the connection from the server is not started , All use the following command to start slave server mode start slave;

7: Check whether the master-slave server is connected smoothly

Execute the following command on the slave server , To check ;

show slave status \G

If the following options appear , The setting is successful ;