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AWS Documentation » Amazon Relational Database Service (RDS) » User Guide » MySQL on Amazon RDS » MySQL on Amazon RDS SQL Reference » mysql.rds_set_external_master

mysql.rds_set_external_master

Configures a MySQL DB instance to be a Read Replica of an instance of MySQL running external to Amazon RDS.

Note

You can use the mysql.rds_set_external_master_with_delay stored procedure to configure an external master and delayed replication.

Syntax

CALL mysql.rds_set_external_master (
  host_name
  , host_port
  , replication_user_name
  , replication_user_password
  , mysql_binary_log_file_name
  , mysql_binary_log_file_location
  , ssl_encryption
);

Parameters

host_name

The host name or IP address of the MySQL instance running external to Amazon RDS to become the replication master.

host_port

The port used by the MySQL instance running external to Amazon RDS to be configured as the replication master. If your network configuration includes Secure Shell (SSH) port replication that converts the port number, specify the port number that is exposed by SSH.

replication_user_name

The ID of a user with REPLICATION CLIENT and REPLICATION SLAVE permissions on the MySQL instance running external to Amazon RDS. We recommend that you provide an account that is used solely for replication with the external instance.

replication_user_password

The password of the user ID specified in replication_user_name.

mysql_binary_log_file_name

The name of the binary log on the replication master that contains the replication information.

mysql_binary_log_file_location

The location in the mysql_binary_log_file_name binary log at which replication starts reading the replication information.

ssl_encryption

A value that specifies whether Secure Socket Layer (SSL) encryption is used on the replication connection. 1 specifies to use SSL encryption, 0 specifies to not use encryption. The default is 0.

Note

This parameter currently is only implemented for Amazon Aurora with MySQL compatibility. On MySQL DB instances, only the default is allowed.

Usage Notes

The master user must run the mysql.rds_set_external_master procedure. This procedure must be run on the MySQL DB instance to be configured as the Read Replica of a MySQL instance running external to Amazon RDS.

Before you run mysql.rds_set_external_master, you must configure the instance of MySQL running external to Amazon RDS to be a replication master. To connect to the MySQL instance running external to Amazon RDS, you must specify replication_user_name and replication_user_password values that indicate a replication user that has REPLICATION CLIENT and REPLICATION SLAVE permissions on the external instance of MySQL.

To configure an external instance of MySQL as a replication master

  1. Using the MySQL client of your choice, connect to the external instance of MySQL and create a user account to be used for replication. The following is an example. 

    CREATE USER 'repl_user'@'mydomain.com' IDENTIFIED BY 'password'

  2. On the external instance of MySQL, grant REPLICATION CLIENT and REPLICATION SLAVE privileges to your replication user. The following example grants REPLICATION CLIENT and REPLICATION SLAVE privileges on all databases for the 'repl_user' user for your domain. 

    GRANT REPLICATION CLIENT, REPLICATION SLAVE ON *.* TO 'repl_user'@'mydomain.com' 
IDENTIFIED BY 'password'

To use encrypted replication, configure the master to use SSL connections. Also, import the certificate authority certificate, client certificate, and client key into the DB instance or DB cluster using the mysql.rds_import_binlog_ssl_material procedure.

Note

We recommend that you use Read Replicas to manage replication between two Amazon RDS DB instances when possible. When you do so, we recommend that you use only this and other replication-related stored procedures. These practices enable more complex replication topologies between Amazon RDS DB instances. We offer these stored procedures primarily to enable replication with MySQL instances running external to Amazon RDS. For information about managing replication between Amazon RDS DB instances, see Working with Read Replicas.

After calling mysql.rds_set_external_master to configure an Amazon RDS DB instance as a Read Replica, you can call mysql.rds_start_replication on the Read Replica to start the replication process. You can call mysql.rds_reset_external_master to remove the Read Replica configuration.

When mysql.rds_set_external_master is called, Amazon RDS records the time, user, and an action of "set master" in the mysql.rds_history and mysql.rds_replication_status tables.

Examples

When run on a MySQL DB instance, the following example configures the DB instance to be a Read Replica of an instance of MySQL running external to Amazon RDS. 

call mysql.rds_set_external_master(
  'Externaldb.some.com',
  3306,
  'repl_user',
  'password',
  'mysql-bin-changelog.0777',
  120,
  0);