Question

Is it possible to configure a managed MySQL database as a replication slave to an existing MySQL database?

Posted November 17, 2020 76 views
MySQLDigitalOcean Managed MySQL Database

I have an existing MySQL database running on a droplet that is already a slave to databases in the field. Our infrastructure currently depends on slave replication to acquire data.

I’d like to migrate to Managed Databases for simplicity, but it doesn’t look like the doadmin user has the replication admin permissions or the ability to grant replication admin permissions.

Am I missing anything or is it not possible to configure a Managed Database as a replication slave?

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1 answer

Hi there @onefourfive,

I believe that what you need to do is to migrate your whole database solution to the Managed Database cluster directly. I don’t think that you can have your Managed Database cluster connected to another unmanaged replication setup, as to do that you essentially need superuser access, which you don’t get with managed solutions.

What I would do in this case is to migrate my existing data to the Managed Database cluster and then add read-only replicas. Then you can add and remove read-only replicas via your control panel with just a click of a button:

https://www.digitalocean.com/docs/databases/postgresql/how-to/add-read-only-nodes

To migrate your datata, you could use the mysqldump tool. Example usage:

  • mysqldump -h your_host -u your_user -p your_db_name > db-name.sql

However, for some extra performance I might sometimes use mysqlpump instead:

https://dev.mysql.com/doc/refman/8.0/en/mysqlpump.html

The syntax is quite similar:

  • mysqlpump -h your_host -u your_user -p your_db_name > db-name.sql

Once you have the databased exported into a .sql file, you can import it with the mysql command into your Managed MySQL cluster.

Syntax:

  • mysql -h your_host -u your_user -p your_db_name < db-name.sql

Once you’ve migrated your data, you will need to update your application/website’s connection strings so that it connects to the new Managed Database cluster and read-only nodes.

Hope that this helps!
Regards,
Bobby

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