Railsのsession storeをAmazon ElastiCache(memcached) へ変更した

Gemfile

+gem 'dalli'

config/environments/production.rb

   # Use a different cache store in production.
-  # config.cache_store = :mem_cache_store
+  config.cache_store = :dalli_store, 'your_app.hoge.cfg.fuga.cache.amazonaws.com'

config/initializers/session_store.rb

# Be sure to restart your server when you modify this file.

-SeniorMode::Application.config.session_store :active_record_store, key: '_your_app_session'
+SeniorMode::Application.config.session_store ActionDispatch::Session::CacheStore

ん、なんか設定足りてるかな…？