DEV Community

Regular 🍟
Regular 🍟

Posted on

A Better Way to Deploy Rails app on Heroku

#rails #heroku #note

Time: 2021-04-03 23:44 UTC+8:00

Author: vonhyou

This article introduces the professional way of deploying Rails app on Heroku.

Force SSL

Modify the file config/environments/production.rb in your Rails app:

# Uncomment this 
config.force_ssl = true
Enter fullscreen mode Exit fullscreen mode

Heroku provide free ssl certificate and it's not necessary to do something else.

Switch to Puma

  1. Add a gem called puma to the Gemfile and install it.
  2. Rewrite the file config/puma.rb 
# Puma configuration file.
max_threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
threads min_threads_count, max_threads_count
port        ENV.fetch("PORT") { 3000 }
environment ENV.fetch("RAILS_ENV") { ENV['RACK_ENV'] || "development" }
pidfile ENV.fetch("PIDFILE") { "tmp/pids/server.pid" }
workers ENV.fetch("WEB_CONCURRENCY") { 2 }
preload_app!
plugin :tmp_restart
Enter fullscreen mode Exit fullscreen mode
  1. Create Procfile 
$ touch ./Procfile
Enter fullscreen mode Exit fullscreen mode
  1. Write Procfile 
web: bundle exec puma -C config/puma.rb
Enter fullscreen mode Exit fullscreen mode
  1. Configurate database for production 
# SQLite. Versions 3.8.0 and up are supported.
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
#
default: &default
  adapter: sqlite3
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  timeout: 5000

development:
  <<: *default
  database: db/development.sqlite3

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: db/test.sqlite3

production:
  adapter:  postgresql
  encoding: unicode
  pool:     <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  database: <APPNAME>_production
  username: <APPNAME>
  password: <%= ENV['<APPNAME>_DATABASE_PASSWORD'] %>
Enter fullscreen mode Exit fullscreen mode

Declare Ruby Version

Modify Gemfile

ruby '2.6.5' # your version
Enter fullscreen mode Exit fullscreen mode

Top comments (3)

Collapse
 
juanvqz profile image
Juan Vasquez •

Why is better puma for heroku?

Collapse
 
vonhyou profile image
Regular 🍟 •

It depends, according to the documentation:

... Puma is a webserver that competes with Unicorn and allows you to handle concurrent requests. Puma uses threads, in addition to worker processes, to make more use of available CPU. You can only utilize threads in Puma if your entire code-base is thread safe. Otherwise, you can still use Puma, but must only scale-out through worker processes.

Link: Deploying Rails Applications with the Puma Web Server

Collapse
 
juanvqz profile image
Juan Vasquez •

Thanks!
I have been using puma because it's the "default" way in Heroku, at least for me it's super easy to use it.

Read next

yegorckv profile image

Importmap Not Working on iOS

Yegor Chsherbakov -

madhuhari188 profile image

Sharing Your Local Rails App for Development and Testing with Ngrok

Madhusudhanan -

geetfun profile image

Using Thruster web server for Ruby apps

Simon Chiu -

shahzaib profile image

🚨 New Rails Versions Released: Addressing ReDoS Vulnerabilities 🚨

Shah Zaib -