Instruction for Use #

MySQL MGR Cluster #

Environmental Requirements #

Supported MySQL versions: 5.7.17~8. x.

Authority Requirements #

Set report_host and report_port.

MySQL 5.7 my.cnf example configuration:

[mysqld]
report_host = mysql_1
report_port = 3306

Execute the following command to confirm whether the settings are correct:

SELECT * FROM performance_schema.replication_group_members;

As shown below, it means report_host and report_port set successfully.

+---------------------------+--------------------------------------+-------------+-------------+--------------+
| CHANNEL_NAME              | MEMBER_ID                            | MEMBER_HOST | MEMBER_PORT | MEMBER_STATE |
+---------------------------+--------------------------------------+-------------+-------------+--------------+
| group_replication_applier | 7d5a5217-6ba1-11ed-9327-0242ac1e0003 | mysql_1     |        3306 | ONLINE       |
| group_replication_applier | 84074902-6ba1-11ed-9309-0242ac1e0004 | mysql_2     |        3306 | ONLINE       |
| group_replication_applier | 8b391fb9-6ba1-11ed-9254-0242ac1e0005 | mysql_3     |        3306 | ONLINE       |
+---------------------------+--------------------------------------+-------------+-------------+--------------+

Grant MySQL account authority to query system database.

Minimize authority using database discovery:

grant SELECT ON performance_schema.* to ${username}@${host};

Execute the following command to check whether the user has the query system permission:

SHOW GRANTS FOR ${username}@${host};

Example results:

+----------------------------------------------------------------------+
| Grants for ${username}@${host}                                       |
+----------------------------------------------------------------------+
| GRANT SELECT ON `performance_schema`.* TO ${username}@${host}        |
+----------------------------------------------------------------------+
1 rows in set (0.01 sec)

MySQL Principal and Subordinate Cluster #

Environmental Requirements #

Supported MySQL versions: 5. x~8. x.

Authority Requirements #

Set report_host.

MySQL 5.7 my.cnf example configuration:

[mysqld]
report_host = mysql_1

Execute the following command to confirm whether the settings are correct:

SHOW SLAVE STATUS \G;

The following shows that the ‘report_host’ setting is successful:

mysql> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 127.0.0.1
                  Master_User: repl
                  Master_Port: 3006
                Connect_Retry: 60
              Master_Log_File: source-bin.000002
          Read_Master_Log_Pos: 1307
               Relay_Log_File: replica-relay-bin.000003
                Relay_Log_Pos: 1508
        Relay_Master_Log_File: source-bin.000002
             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: 1307
              Relay_Log_Space: 1858
              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: 3e11fa47-71ca-11e1-9e33-c80aa9429562
             Master_Info_File: /var/mysqld.2/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Reading event from the relay log
           Master_Retry_Count: 10
                  Master_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Master_SSL_Crl:
           Master_SSL_Crlpath:
           Retrieved_Gtid_Set: 3e11fa47-71ca-11e1-9e33-c80aa9429562:1-5
            Executed_Gtid_Set: 3e11fa47-71ca-11e1-9e33-c80aa9429562:1-5
                Auto_Position: 1
         Replicate_Rewrite_DB:
                 Channel_name:
           Master_TLS_Version: TLSv1.2

Give MySQL account permission related to Replication.

Minimize permissions using database discovery:

grant REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO ${username}@${host};

Execute the following command to check whether the user has the query system permission:

SHOW GRANTS FOR ${username}@${host};

Example results:

+--------------------------------------------------------------------------+
| Grants for ${username}@${host}                                           |
+--------------------------------------------------------------------------+
| GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO ${username}@${host}|
+--------------------------------------------------------------------------+
1 rows in set (0.01 sec)