Couchbase, dalli gem, rails and sessions

I'm trying to get the dalli gem talking to a couchbase server for session storage. Right now I have in my session_store.rb:

Rails.application.config.session_store :dalli_store, :memcache_server => ['1.1.1.1'], :password => "xxxxx", :namespace => "xxxx", :expire_after => 5.days

There are multiple buckets setup on this couchbase server and I have one assigned to me to use. How do I tell dalli to talk to it? Right now everything is going to the default bucket.