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7.11.1 Prerequisites

To use a MySQL instance as a Read Replica, it must meet the following criteria:

  • The instance must be a standalone MySQL server.

  • The instance must be MySQL 8.0.23, or higher.

  • The instance must not have any unmanaged replication channels configured.

  • The instance must use the same credentials as those used to manage the Cluster.

When an instance is added as a Read Replica, the AdminAPI runs the same compatibility tests on it as it does an instance being added to a Cluster. The same variables are checked, and so on. As such, it is recommended you run dba.checkInstanceConfiguration() or dba.configureInstance() before attempting to create a Read Replica.