redis.rb

#config/initializers/redis.rb
require 'redis'
require 'redis/objects'

REDIS_CONFIG = YAML.load( File.open( Rails.root.join("config/redis.yml") ) ).symbolize_keys
dflt = REDIS_CONFIG[:default].symbolize_keys
cnfg = dflt.merge(REDIS_CONFIG[Rails.env.to_sym].symbolize_keys) if REDIS_CONFIG[Rails.env.to_sym]

$redis = Redis.new(cnfg)
Redis::Objects.redis = $redis
#$redis_ns = Redis::Namespace.new(cnfg[:namespace], :redis => $redis) if cnfg[:namespace]

# To clear out the db before each test
$redis.flushdb if Rails.env = "test"

redis.yml

#config/redis.yml
default:
  host: localhost
  port: 6379
development:
  db: 0
#  namespace: appname_dev
test:
  db: 1
#  namespace: appname_test
production:
  db: 2
  host: 192.168.1.100
#  namespace: appname_prod

Remember to add 'redis-namespace' to your Gemfile if your using that version. # Yes?