# MacOS Terminal brew install redis brew services start redis





# Ubuntu Terminal sudo apt install redis-server





# irb 2.3.3 :001 > require 'redis' => true 2.3.3 :002 > redis = Redis.new => # 2.3.3 :003 > redis.set 'key', 'value' => "OK" 2.3.3 :004 > redis.get 'key' => "value"



Using Redis as a cache





# Gemfile gem 'redis-rails'





# config/environments/development.rb config.cache_store = :redis_store, { host: 'localhost', port: 6379, db: 0, namespace: '056redis' }



You will also need to configure the production environment file with the Redis cache. Instead of specifying the values within each configuration file, I recommend using the secrets.yml file instead. For example,





# config/environments/development.rb config.cache_store = :redis_store, { host: Rails.application.secrets.redis_server, port: Rails.application.secrets.redis_port, db: Rails.application.secrets.redis_cache_database, namespace: Rails.application.secrets.redis_cache_namespace }





# secrets.yml development: secret_key_base: ... redis_server: localhost redis_port: 6379 redis_cache_database: 0 redis_cache_namespace: '056redis'





# index.html <% cache 'word-of-the-hour', expires_in: Time.now.beginning_of_hour + 1.hour do %> <%= %w(happy developer watch drifting ruby screencasts about rails).sample %> <% end %>