MULTISOURCE REPLICATION MYSQL(8.0.32)

Multi-source replication in MySQL 8 allows you to replicate data from multiple source databases into a single destination database. It’s a powerful feature for consolidating data from different sources. To enable multi-source replication, make sure you have MySQL 8 installed and configured. Then, open your MySQL configuration file

This involves setting up two master databases, MASTER1 and MASTER2, and a slave database, SLAVE, to replicate data from both masters.

MASTER1,MASTER2 Configuration:

STEP1: Edit MySQL Configuration File

vi /etc/my.cnf

STEP2: Add the following lines

server-id=1
log_bin=mysql-bin
gtid_mode=ON
enforce_gtid_consistency=ON
binlog_do_db=medical

server-id=2
log_bin=mysql-bin
gtid_mode=ON
enforce_gtid_consistency=ON
binlog_do_db=medical

STEP3: Restart MySQL Service

systemctl restart mysqld

STEP4: Access MySQL Console

mysql -uroot -pTest@123

STEP5: Create Database and User

CREATE DATABASE medical;
CREATE USER 'gtiduser'@'%' IDENTIFIED WITH mysql_native_password BY 'Meena@123!';
GRANT REPLICATION SLAVE ON *.* TO 'gtiduser'@'%';
FLUSH PRIVILEGES;

STEP6: Enable Read-Only Mode and Get Master Status

SET @@GLOBAL.read_only = ON;

STEP7: master status

SHOW MASTER STATUS\G 

SLAVE Configuration:

STEP1: Edit MySQL Configuration File

vi /etc/my.cnf

STEP2: Add the following lines

server-id=3
log_bin=mysql-bin
gtid_mode=ON
enforce_gtid_consistency=ON

STEP3: Restart MySQL Service

systemctl restart mysqld

STEP4: Access MySQL Console

mysql -uroot -pTest@123

STEP5: Create Databases

CREATE DATABASE medical;
CREATE DATABASE ecom;

STEP6: Enable Read-Only Mode

SET @@GLOBAL.read_only = ON;
EXIT;

STEP7 : Install Telnet and Test Connectivity

yum install -y telnet
telnet -x 3.81.74.123 3306
telnet -x 3.89.69.142 3306

STEP8: Access MySQL Console and Configure Replication

mysql -uroot -pTest@123

STEP9 : Insert the master IP

CHANGE MASTER TO
MASTER_HOST='3.81.74.123',
MASTER_USER='gtiduser',
MASTER_PORT=3306,
MASTER_PASSWORD='Meena@123!',
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=835 FOR CHANNEL 'channel1';

CHANGE MASTER TO
MASTER_HOST='3.89.69.142',
MASTER_USER='gtiduser',
MASTER_PORT=3306,
MASTER_PASSWORD='Meena@123!',
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=835 FOR CHANNEL 'channel2';

STEP10 : Start Slave

START SLAVE;

STEP11 : Replication for slave status

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for source to send event
                  Master_Host: 3.81.74.123
                  Master_User: gtiduser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 835
               Relay_Log_File: ip-172-31-47-144-relay-bin-channel1.000002
                Relay_Log_Pos: 326
        Relay_Master_Log_File: mysql-bin.000001
             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: 835
              Relay_Log_Space: 556
              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: a9e33cdd-41aa-11ee-b596-0ecd4152823f
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Replica 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: ad5203cd-41aa-11ee-a752-0e9982aff945:1-2
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name: channel1
           Master_TLS_Version:
       Master_public_key_path:
        Get_master_public_key: 0
            Network_Namespace:
*************************** 2. row ***************************
               Slave_IO_State: Waiting for source to send event
                  Master_Host: 3.89.69.142
                  Master_User: gtiduser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 835
               Relay_Log_File: ip-172-31-47-144-relay-bin-channel2.000002
                Relay_Log_Pos: 326
        Relay_Master_Log_File: mysql-bin.000001
             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: 835
              Relay_Log_Space: 556
              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: ab38097d-41aa-11ee-b07d-0ed011794589
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Replica 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: ad5203cd-41aa-11ee-a752-0e9982aff945:1-2
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name: channel2
           Master_TLS_Version:
       Master_public_key_path:
        Get_master_public_key: 0
            Network_Namespace:
2 rows in set, 1 warning (0.00 sec)

mysql>
mysql>
mysql>
mysql>

By following these steps, you will have successfully set up multi-source replication in MySQL. The slave database will replicate data from both MASTER1 and MASTER2, allowing for a more flexible and redundant data replication setup.