Use `mc admin config set` command to update MySQL notification configuration for the deployment with `dsn_string` parameter:

```sh
mc admin config set myminio notify_mysql:myinstance table="minio_images" dsn_string="root:xxxx@tcp(172.17.0.1:3306)/miniodb"
```

Note that, you can add as many MySQL server endpoint configurations as needed by providing an identifier (like "myinstance" in the example above) for each MySQL instance desired.