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

simpleJob2

simpleJob-copy

viewImages

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runRailsUsingCustomImage

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RSpec-Ch8_5

RSpec-Ch8_6

RSpec-Ch8_6_GUI

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dockerComposePostgres1

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postgress_last_lesson

Ch12_2

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Ch12_3

gem_1

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Cloud

Cloud_DO

Cloud_1

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Cloud_2_2

Cloud_2_4

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Cloud_1_1_bucket

dockerComposeRedis3-copy

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Cloud_DO_2

chap4_1

chap5_3

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challenge

simpleJob2-ForceRelaunch

simpleJob-ForceRelaunch

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testing

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chap5_3-copy

chap5_4-copy

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postgress_2nd_last_lesson-copy

postgress_last_lesson-copy

webPackerCh7_2-copy

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

As we draw to the close of this section on development, let’s take a moment to reflect on what we have achieved. At first glance, it is easy to mistakenly think we have gone through a fair amount of effort only to arrive back where we started: with a standard, working Rails app.

In fact, though, we have achieved some major benefits:

* Our **Dockerfile** and **docker-compose.yml** file give us a declarative description of our entire application—with all its required parts, such as the database—helping to give a clear picture of what makes up the application.

* We can spin up the entire application with a single command, even with nothing previously installed. Docker downloads and installs what we need.

* We have eliminated the need to manually install our app’s main software dependencies on our local machine. No more fiddling with getting Redis, Postgres, or even Ruby installed and running on compatible versions
across the whole team. Docker is taking care of all of this for us. 

* Our app can run on any machine with Docker installed. It gives us freedom and portability.

* Upgrading parts of our application is as simple as updating the version
number of the image we refer to in our Compose file. It is a breeze to see
how our app works on a newer version of Ruby, for example.


For all these reasons, using Docker in development is useful in and of
itself. You should feel proud to have reached this milestone. However, the
journey does not stop here. Docker can bring even more benefits, as we will see in subsequent chapters.

Let’s take a moment to reflect on what we have achieved using Docker for development purposes.

Closing Thoughts on Docker in Development

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

Closing Thoughts on Docker in Development

Highlights