Deploying a Rails Application to Heroku

Overview

This clinic walks through the process of deploying a Rails app to Heroku.

We'll start with a sample Rails app that we've cloned from GitHub.

1. brew install heroku
2. Make an account on Heroku if you have not already done so

Deploying a Rails app to Heroku docs

Some notes about your Rails app:

Gemfile

Your Gemfile should contain this:

group :production do
  gem "puma"
  gem "rails_12factor"
end

rails_12factor is a Heroku gem that does 12 different things.

database.yml

Your database.yml file should contain a couple lines for production

production:
  <<: *default
  database: heroku_clinic_production
  username: heroku_clinic
  password: <%= ENV['HEROKU_CLINIC_DATABASE_PASSWORD'] %>

Add config/puma.rb file

workers Integer(ENV['WEB_CONCURRENCY'] || 2)
threads_count = Integer(ENV['MAX_THREADS'] || 5)
threads threads_count, threads_count

preload_app!

rackup      DefaultRackup
port        ENV['PORT']     || 3000
environment ENV['RACK_ENV'] || 'development'

Deployment!

heroku create

Type in git remote -v to ensure that an endpoint called heroku has been created.

git push heroku master
heroku run rails db:migrate
heroku run rake db:seed
heroku logs -t to check out any errors