Heroku deployment in Ruby on Rails - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Heroku in the context of Rails applications?

Heroku is a cloud platform that lets you deploy, run, and manage Rails apps easily without managing servers.

beginner

Which command initializes a new Git repository if you don't have one before deploying to Heroku?

git init initializes a new Git repository in your project folder.

intermediate

Why do you need a Procfile in a Rails app for Heroku deployment?

A Procfile tells Heroku how to start your app, usually by running the web server.

intermediate

What is the purpose of running heroku run rails db:migrate after deployment?

It runs database migrations on the Heroku server to update the database schema to match your app.

intermediate

How do you set environment variables like secret keys on Heroku?

Use heroku config:set KEY=VALUE to securely set environment variables for your app.

What is the first step to deploy a Rails app to Heroku?

A Create a Git repository

B Run <code>rails server</code>

C Install Node.js

D Write a Dockerfile

Heroku uses Git to deploy apps, so you must have a Git repository first.

Which file tells Heroku how to start your Rails app?

A Procfile

B database.yml

C Gemfile

D config.ru

The Procfile specifies the command Heroku runs to start your app.

How do you push your code to Heroku for deployment?

A rails deploy

B git push heroku main

C heroku deploy

D git push origin main

You push your code to the Heroku remote repository using git push heroku main.

What command runs database migrations on Heroku?

A heroku migrate

B rails db:migrate

C heroku run rails db:migrate

D git migrate

You run migrations on Heroku with heroku run rails db:migrate.

How do you set a secret key environment variable on Heroku?

A git config secret_key abc123

B heroku set secret_key=abc123

C rails secret set abc123

D heroku config:set SECRET_KEY=abc123

Use heroku config:set to set environment variables securely.

Explain the steps to deploy a Rails app to Heroku from a local project.

Think about preparing your app, connecting to Heroku, and updating the database.

Describe how environment variables are managed in Heroku for a Rails app.

Consider how to keep secrets safe and accessible in production.