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Docker for Rails Developers

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Introduction

Who is this Course for?Why Use Docker for Rails?

A Brave New World

Basic Concepts — Images and Containers Running a Ruby Script Without Ruby Installed Generating a New Rails App Without Ruby Installed Docker Architecture Quick Recap Quiz: A Brave New World

Running a Rails App in a Container

How Do We Run Our Rails App?Dockerfile Creation and Explanation Defining Our First Custom Image Running a Rails Server with Our Image Quick Recap Quiz: Running a Rails App in a Container

Fine-Tuning Our Rails Image

A Default Command .dockerignore File The Image Build Cache Caching Issues Quick Recap Quiz: Fine-Tuning Our Rails Image

Describing Our App Declaratively with Docker Compose

Getting Started with Compose Launching the Rails app Mounting a Volume Using Compose and Sharing Images Starting and stopping services Other Common Tasks Quick Recap Quiz: Describing Our App Declaratively with Docker Compose 🍀 Challenge

Beyond the App: Adding Redis

Starting a Redis Server Making a Manual Connection to Redis Server Learning How Containers Communicate Our Rails App and Redis Communication Quick Recap Quiz: Beyond the App: Adding Redis

Course Assessment

Docker for Rails Developer—Exam 1

Adding a Database: Postgres

Starting a Postgres Server Connecting to Postgres from a Separate Container Creating Our App Databases Restarting Our Rails Server with Database Decoupling Data From a Container Quick Recap Quiz: Adding a Database: Postgres

Playing Nice with JavaScript

Front-End Options

Compiling Assets with Webpacker

A Hello World React App

Running Tests: Configuring RSpec

Quiz: Playing Nice with JavaScript

Testing in a Dockerized Environment

Ruby Testing Framework: RSpec Our First Test using RSpec Setting Up Rails System Tests Running Tests: Providing Support for JavaScript Seeing the Tests Run Debugging Quick Recap Quiz: Testing in a Dockerized Environment

Advanced Gem Management

The Downside to Our Existing Approach Solution To Manage Gems Effectively Testing The New Method Of Gem Management Quick Recap Quiz: Advanced Gem Management

Some Minor Irritations

Rails Server not starting?Server Not Shutting Down Gracefully Quick Recap Quiz: Some Minor Irritations Closing Thoughts on Docker in Development

Course Assessment

Docker for Rails Developer—Exam 2

The Production Landscape

The “Ops” in DevOps Container Orchestration A Tale of Two Orchestrators: Swarm and Kubernetes IaaS vs. CaaS Provisioning Your Infrastructure CaaS Platforms Serverless for Containers How to Decide What’s Right for Me?Quick Recap Quiz: The Production Landscape

Preparing for Production

Configuring a Production Environment A Production Image How to make Custom Image Quick Recap Quiz: Preparing for Production

A Production-Like Playground

Production-Like Environment Exploring the Docker Machine Introducing Docker Swarm Describing Our App to Swarm Migrating the Database Deploying Our App on a Swarm Tasks and Swarm’s Scaling Model Scaling Up the Service Quick Recap Quiz: A Production-Like Playground

Deploying to the Cloud

The Cloud: Our Final Frontier Deploying to AWS Visualizing Containers Scaling Up Cleaning Up Deploying to DigitalOcean Quick Recap Quiz: Deploying to the Cloud

Course Assessment

Docker for Rails Developer - Exam 3

Closing Thoughts and Next Steps

Reflection on Journey What Should I Learn About Next?What More Can I Learn?

APPENDIX

Installing Docker Platform Differences Finding Images to Use

A Hello World React App

We will run a basic Hello React App in this lesson.

We'll cover the following

hello_react.jsx
home.html.erb
- 🍀 Practice

hello_react.jsx

Our purpose here is to ensure we can configure our Rails app by using Docker to allow us to develop modern JavaScript apps using technologies like React. To that end, we just need to show that a simple React app is compiled and loads correctly with our setup. When we install Webpacker, it adds a sample “Hello World” React app in app/javascript/packs/hello_react.jsx that renders a <div> saying “Hello React!”:

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