Connecting to a sharded cluster using Ruby is no different than connecting to a replica set. Using the official Ruby driver, we have to configure the client object to define the set of mongos servers, as shown in the following code:

client = Mongo::Client.new('mongodb://key:password@mongos-server1-host:mongos-server1-port,mongos-server2-host:mongos-server2-port/admin?ssl=true&authSource=admin')

The mongo-ruby-driver will then return a client object, which is no different than connecting to a replica set from the Mongo Ruby client. We can then use the client object as we did in previous chapters, with all the caveats around how sharding behaves differently than a standalone server or a replica set with regards to querying and performance.