Last updated February 02, 2021

Static sites are sites that don’t contain any dynamic server-side functionality or application logic. Examples include brochure sites made up completely of HTML and CSS or even interactive client-side games built in Flash that don’t interact with a server component. Though these sites only require a web-server to deliver their content to users it’s still useful to use a platform like Heroku to quickly provision and deploy to such infrastructure.

Using the Rack framework, static sites can be quickly deployed to Heroku.

Prerequisites

This guide assumes you have the following:

• A Heroku account. Signup is free and instant.
• The Heroku CLI installed
• Ruby and the Bundler gem installed

Create directory structure

Run the following command to create the directory structure for Rack to serve static files:

$ mkdir -p site/public/{images,js,css}
$ touch site/{config.ru,public/index.html}
$ cd site && bundle init

This will create the following directory structure:

- site
  |- config.ru
  |- Gemfile
  |- public
    |- index.html
    |- images
    |- js
    |- css

Specify dependencies

Many dynamic applications require dozens of third-party libraries and frameworks to run. Static sites, however, require very little support from other libraries. In this case only the rack gem is required. In the Gemfile file add the following:

source 'https://rubygems.org'
gem 'rack'

and run the bundle command to download and resolve the rack dependency.

$ bundle install
Using rack (1.4.1)
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

File server configuration

Rack must be told which files it should serve as static assets. Do this by editing the config.ru file so it contains the following:

use Rack::Static,
  :urls => ["/images", "/js", "/css"],
  :root => "public"

run lambda { |env|
  [
    200,
    {
      'Content-Type'  => 'text/html',
      'Cache-Control' => 'public, max-age=86400'
    },
    File.open('public/index.html', File::RDONLY)
  ]
}

This template assume that you place images, javascript files and css files in the images, css, and js directories, respectively, and use relative references to them in your HTML.

Running locally

To run your site locally and view any modifications before deploying to Heroku run the following command in the site directory:

$ rackup
>> Thin web server (v1.5.0 codename Knife)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:9292, CTRL+C to stop

Go to your browser and open http://localhost:9292 to see your static site loaded. As you make changes to the site you only need to reload your browser to view the changes – you don’t have to bounce the server.

Deploy to Heroku

Before deploying your site to Heroku you will need to store your code in the Git version control system which was installed for you as part of the Heroku CLI. When inside the site root directory execute the following commands:

$ git init
$ heroku create
$ git add .
$ git commit -m "Initial static site template app"

Use git to deploy to Heroku as well.

$ git push heroku master
Counting objects: 6, done.
Delta compression using up to 4 threads.
...

-----> Heroku receiving push
-----> Ruby app detected
...
-----> Launching... done, v1
       http://blazing-galaxy-997.herokuapp.com deployed to Heroku

At this point your site is deployed to Heroku and has been given an auto-generated URL. Open your site using the heroku open command:

$ heroku open
Opening blazing-galaxy-997... done

Updating

When making changes to your site, edit the necessary files locally, commit them to Git, and push to Heroku to see the changes deployed.

$ git commit -m "Update landing page"
$ git push heroku master