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MySQL 8.0 Reference Manual  /  ...  /  Using Replica Sets with MySQL Router

21.6.6 Using Replica Sets with MySQL Router

You can use MySQL Router 8.0.19 and later to bootstrap against a replica set, in the same way that InnoDB cluster can be bootstrapped. See Section 21.4, “Using MySQL Router with InnoDB Cluster”. The only difference in the generated MySQL Router configuration file is the addition of the cluster_type option. When MySQL Router is bootstrapped against a replica set, the generated configuration file includes:


When you use MySQL Router with a replica set, be aware that:

  • The read-write port of MySQL Router directs client connections to the primary instance of the replica set

  • The read-only port of MySQL Router direct client connections to a secondary instance of the replica set, although it could also direct them to the primary

  • MySQL Router obtains information about the replica set's topology from the primary instance

  • MySQL Router automatically recovers when the primary instance becomes unavailable and a different instance is promoted

You work with the MySQL Router instances which have been bootstrapped against a replica set in exactly the same way as with InnoDB cluster. See Working with a Cluster's Routers for information on ReplicaSet.listRouters() and ReplicaSet.removeRouterMetadata().