AWS_ACCESS_KEY_ID

AWS_SECRET_ACCESS_KEY

AWS_DEFAULT_REGION

INTERNAL_IP

IP_PORT

SWARM_TOKEN

BUCKET

DIGITAL_OCEAN_TOKEN

Gain insights into Docker architecture, images, and containers. Delve into Docker Compose, JS integration, and production readiness. Master deploying, clustering, and scaling Rails apps using Docker tools.

tarball.tar.gz

simpleJob

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Cloud

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This course is your field manual for building Rails applications with Docker. 

To kick things off, you’ll start by learning the basics of Docker like architecture, images, and containers. You will then be introduced to Docker Compose and use it to build up to a multiservice application with Redis.

You will then work to get your Dockerized setup to play nice with JavaScript, using both the standard asset pipeline and webpacker, Rails’ newest approach for integrating modern JavaScript front ends.

Lastly, you will learn how to prepare your Rails app for production. Once ready, using Docker’s own tools, you will provision machines, create a cluster, deploy the app, and scale the app’s resources to meet its changing needs.

By the end of the course, you will be able to confidently use Docker in any of your further projects.

Docker for Rails Developers

# Highlights

Who knew that gem management could be such a hot topic? With this new
option at your disposal, you should feel ready for anything.
Let’s take a look at what we have covered in this chapter:
1. We discussed the downsides to our previous approach to managing gems:
any gem changes required all gems to be reinstalled from scratch.

2. We explored a way to speed up gem changes that involved creating a volume for caching our gems. By mounting the volume into our container (and setting `BUNDLE_PATH`), we could manage our gems manually and benefit
from faster builds.

Hopefully, you are also starting to appreciate the meta point here: how problems
with our Docker setup can be identified, thought through, and eventually solved in creative ways. The more you use Docker and understand how it works, the more you will start spotting opportunities for improvements yourself.

Good as it is, Compose is not without failings. 

# What to expect in the next chapter?

In the spirit of full disclosure, we are going to explore a couple of common pain points you may encounter when using Compose. In the following chapter, you will learn about these irritations and what we can do to minimize their impact.

Let's review what we have covered so far.

Quick Recap

Introduction

A Brave New World

Running a Rails App in a Container

Fine-Tuning Our Rails Image

Describing Our App Declaratively with Docker Compose

Beyond the App: Adding Redis

Docker for Rails Developer—Exam 1

Adding a Database: Postgres

Playing Nice with JavaScript

Testing in a Dockerized Environment

Advanced Gem Management

Some Minor Irritations

Docker for Rails Developer—Exam 2

The Production Landscape

Preparing for Production

A Production-Like Playground

Deploying to the Cloud

Docker for Rails Developer - Exam 3

Closing Thoughts and Next Steps

APPENDIX

Quick Recap

Highlights