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These steps assume that binary logging is enabled on the source (which is the default), the replica is usingTABLE based replication applier metadata repositories (which is the default in MySQL 8.0), and that you have enabled a replication user and noted the current binary log file name and position.

Use theCHANGE REPLICATION SOURCE TO statement (from MySQL 8.0.23) orCHANGE MASTER TO statement (before MySQL 8.0.23) to configure a replication channel for each source on the replica (seeSection 19.2.2, “Replication Channels”). TheFOR CHANNEL clause is used to specify the channel. For example, to addsource1 andsource2 as sources to the replica, use themysql client to issue the statement twice on the replica, like this:

mysql> CHANGE MASTER TO MASTER_HOST="source1", MASTER_USER="ted", MASTER_PASSWORD="password", \MASTER_LOG_FILE='source1-bin.000006', MASTER_LOG_POS=628 FOR CHANNEL "source_1";mysql> CHANGE MASTER TO MASTER_HOST="source2", MASTER_USER="ted", MASTER_PASSWORD="password", \MASTER_LOG_FILE='source2-bin.000018', MASTER_LOG_POS=104 FOR CHANNEL "source_2";Or from MySQL 8.0.23:mysql> CHANGE REPLICATION SOURCE TO SOURCE_HOST="source1", SOURCE_USER="ted", SOURCE_PASSWORD="password", \SOURCE_LOG_FILE='source1-bin.000006', SOURCE_LOG_POS=628 FOR CHANNEL "source_1";mysql> CHANGE REPLICATION SOURCE TO SOURCE_HOST="source2", SOURCE_USER="ted", SOURCE_PASSWORD="password", \SOURCE_LOG_FILE='source2-bin.000018', SOURCE_LOG_POS=104 FOR CHANNEL "source_2";

To make the replica replicate only databasedb1 fromsource1, and only databasedb2 fromsource2, use themysql client to issue theCHANGE REPLICATION FILTER statement for each channel, like this:

mysql> CHANGE REPLICATION FILTER REPLICATE_WILD_DO_TABLE = ('db1.%') FOR CHANNEL "source_1";mysql> CHANGE REPLICATION FILTER REPLICATE_WILD_DO_TABLE = ('db2.%') FOR CHANNEL "source_2";

For the full syntax of theCHANGE REPLICATION FILTER statement and other available options, seeSection 15.4.2.2, “CHANGE REPLICATION FILTER Statement”.