Simple strategy for Redis in Ruby-on-Rails
Here's a simple "it just works" approach to using Redis in your Rails app.
Quick background first. Redis requires a redis-server to be running. A redis-server runs against a port (the default port is 6381). While you can use name-spacing strategies to use the same redis-server for multiple redis db's it's not recommended (see KISS principle).
First: Install Redis
brew install redis
Second: Add to your project
Add this to Gemfile
gem 'redis'
And bundle install
Create config/redis/development.conf
daemonize yes port 6390 logfile ./log/redis_development.log dbfilename ./db/development.rdb
Create config/redis/test.conf
daemonize yes port 6391 logfile ./log/redis_test.log dbfilename ./db/test.rdb
These scripts tell redis to start up on port #### - it can be any number but I'd recommend not using 6381 (the default) in case something else is running against that. Redis conf's can do quite a bit and are worth reading up on before hitting production. Example of a fairly complex redis.conf file
While you can start up redis outside of rails, for simplicity sake, when working with other devs, why not make idiot proof for them? Less in the readme. We do this in this init script
Create config/init/redis_init.rb
require "redis"redis_conf = File.read(Rails.root.join("config/redis", "#{Rails.env}.conf"))
port = /port.(\d+)/.match(redis_conf)[1]
</span><span style="color:#2B2">redis-server </span><span style="background-color:hsla(0,0%,0%,0.07);color:black"><span style="font-weight:bold;color:#666">#{</span>redis_conf<span style="font-weight:bold;color:#666">}</span></span><span style="color:#161">res =</span><span style="color:#2B2">ps aux | grep redis-server</span><span style="color:#161">unless res.include?("redis-server") && res.include?(redis_conf) raise "Couldn't start redis" end
REDIS = Redis.new(:port => port)
If you're deploying to Heroku and using redis-to-go - you can use the modified script below.
require "redis"
if ::Rails.env == "production" uri = URI.parse(ENV["REDISTOGOURL"]) REDIS = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password) else redisconf = File.read(Rails.root.join("config/redis", "#{Rails.env}.conf"))
port = /port.(\d+)/.match(redis_conf)[1]
</span><span style="color:#2B2">redis-server </span><span style="background-color:hsla(0,0%,0%,0.07);color:black"><span style="font-weight:bold;color:#666">#{</span>redis_conf<span style="font-weight:bold;color:#666">}</span></span><span style="color:#161">res =</span><span style="color:#2B2">ps aux | grep redis-server</span><span style="color:#161">unless res.include?("redis-server") && res.include?(redis_conf) raise "Couldn't start redis" end
REDIS = Redis.new(:port => port) end
Now you should be able to fire up bundle exec rails c and see that it's working by using the REDIS constant
irb(main):001:0> REDIS.keys => []
Latest Articles by Our Team
Our expert team of designers and developers love what the do and enjoy sharing their knowledge with the world.
-
Five UX Tips for Better Dashboards
-
Dissecting Code With Ruby's caller Method
-
Handling deletes with Null Object Pattern in Ruby
We Hire Only the Best
reinteractive is Australia’s largest dedicated Ruby on Rails development company. We don’t cut corners and we know what we are doing.
We are an organisation made up of amazing individuals and we take pride in our team. We are 100% remote work enabling us to choose the best talent no matter which part of the country they live in. reinteractive is dedicated to making it a great place for any developer to work.
Free Community Workshops
We created the Ruby on Rails InstallFest and Ruby on Rails Development Hub to help introduce new people to software development and to help existing developers hone their skills. These workshops provide invaluable mentorship to train developers, addressing key skills shortages in the industry. Software development is a great career choice for all ages and these events help you get started and skilled up.
-
Webinars
Webinars are our online portal for tips, tricks and lessons learned in everything we do. Make the most of this free resource to help you become a better developer.
-
Installfest
The Ruby on Rails Installfest includes a full setup of your development environment and step-by-step instructions on how to build your first app hosted on Heroku. Over 1,800 attendees to date and counting.
-
Development Hub
The Ruby on Rails Development Hub is a monthly event where you will get the chance to spend time with our team and others in the community to improve and hone your Ruby on Rails skills.