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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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

# Docker set-up

Let’s get you set up with Docker on your machine. We are going to be using the free, Community Edition (CE), rather than the Enterprise Edition (EE).

Docker CE itself comes in two versions: **Edge**, which contains the latest features being developed, and **Stable**, which is, well, more stable. Make sure to install the latter as we do not want any unexpected surprises getting in the way of your learning.

Read the following instructions for your OS and then install Docker.

# macOS <img src="/api/collection/10370001/4574189490012160/page/5940543863914496/image/5984935454703616" height=30px width=30px />

Docker provides a downloadable installer called Docker for Mac, which has everything you need in one neat package (it is currently a 115.6 MB download). Install this following the installation <a href="https://docs.docker.com/docker-for-mac/install/"/>instructions</a>.

Once installed, Docker for Mac adds a menu bar app in the top right of the screen featuring Docker’s logo, which is its whale mascot named “Moby Dock.” The menu bar not only tells you whether Docker is running, but it also provides other useful information and settings. You can find more about the advanced settings available in <a href="https://docs.docker.com/docker-for-mac/#preferences">docs</a>.


# Linux <img src="/api/collection/10370001/4574189490012160/page/5940543863914496/image/6719143437402112" height=40px width=40px />

Unfortunately, getting started with Docker on Linux is a bit more complicated than it is on other platforms. As you would probably expect, how you install it depends on your Linux distribution.

Visit the Docker CE installation <a href="https://docs.docker.com/install/">docs</a>, select your Linux distribution from
the navigation menu, then follow the instructions. Typically, this involves
installing Docker with your distro’s package manager, which may need to get the latest packages from Docker’s repository, as the distro packages are often outdated.

You will also need to review Docker’s post-installation <a href="https://docs.docker.com/engine/installation/linux/linux-postinstall/">instructions </a> to make sure you have everything set up correctly. It will help you troubleshoot any issues you may encounter.

Docker Compose, on Linux, is installed separately. Install this using the <a href="https://docs.docker.com/compose/install/">documentation </a> provided. If you happen to have it installed already, you should recommend upgrade to the latest, stable version.

# Windows <img src="/api/collection/10370001/4574189490012160/page/5940543863914496/image/5528887505715200" height=40px width=40px />


How to install Docker on Windows depends on whether your system supports <a href="https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/hyper-v-requirements">Hyper-V</a>, Microsoft’s homegrown virtualization technology. Professional, Enterprise, or Education editions (64-bit versions) of Windows 8 and up do support it—hardware permitting—but Windows Home edition, notably, does not.

If your system supports Hyper-V, download the Docker for Windows <a href="https://docs.docker.com/docker-for-windows/install/">installer</a>,
launch it, and follow the instructions. Docker for Windows installs a widget
in the Windows notification area at the bottom right of your screen (you may
need to click to reveal it). Clicking the widget will open up a menu where you
can find more info and adjust various <a href="https://docs.docker.com/docker-for-windows/#docker-settings">settings</a>.


If your system does not support Hyper-V, you will need to download and install <a href="https://docs.docker.com/toolbox/toolbox_install_windows/">Docker Toolbox</a>, a legacy way of running Docker on Windows.

# Verifying your install
Now we will check if Docker is installed and running correctly. Since Docker is a command-line tool, crack open your favorite terminal, and enter
the following command:
```text
$ docker version
```

If all is well, you should see some output like the following:
```text
Client:
 Version:           19.03.8
 API version:       1.40
 Go version:        go1.13.8
 Git commit:        afacb8b7f0
 Built:             Wed Oct 14 19:43:43 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          20.10.0
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       eeddea2
  Built:            Tue Dec  8 18:57:45 2020
  OS/Arch:          linux/amd64
  Experimental:     false
```
# 🍀 Practice

Connect the terminal below and try running the `docker version` command in it:

Learn how to install Docker on your machine.

Installing Docker

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

Installing Docker

Docker set-up