#### 17.1.5.4 Adding Binary Log Based Replication Sources to a Multi-Source Replica

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 These steps assume that binary logging is enabled on the source (which is the default), the replica is using `TABLE` 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 the [`CHANGE REPLICATION SOURCE TO`](change-replication-source-to.html) statement (from MySQL 8.0.23) or [`CHANGE MASTER TO`](change-master-to.html) statement (before MySQL 8.0.23) to configure a replication channel for each source on the replica (see [Section 17.2.2, “Replication Channels”](replication-channels.html)). The `FOR CHANNEL` clause is used to specify the channel. For example, to add `source1` and `source2` as sources to the replica, use the [**mysql**](mysql.html) 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 database `db1` from `source1`, and only database `db2` from `source2`, use the [**mysql**](mysql.html) client to issue the [`CHANGE REPLICATION FILTER`](change-replication-filter.html) 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 the [`CHANGE REPLICATION FILTER`](change-replication-filter.html) statement and other available options, see [Section 13.4.2.2, “CHANGE REPLICATION FILTER Statement”](change-replication-filter.html).

