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

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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

# What is a container? 
A container is an isolated or **sandboxed** execution environment for executing software. Containers rely on virtualization features built into the Linux kernel, which creates a fully isolated set of processes that do not know about the rest of the system.

Containers can be started, paused, resumed, and stopped like virtual machines (VMs). This similarity aside, containers are different beasts. VMs require a host OS, a software abstraction layer known as a hypervisor, and an entire OS installation for each instance. On the other hand, each container is just piggybacking on the resources of a single kernel, with just a thin layer of isolation. 

This means you can run many more containers on a single machine in comparison to VMs. They’re also faster and use fewer resources. 



Let's look into two fundamental concepts of Docker: containers and images. 


Basic Concepts — Images and Containers

Let's look into two fundamental concepts of Docker: containers and images.

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

Basic Concepts — Images and Containers

What is a container?