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

dockerCompose1

challenge1

dockerComposeRedis1

dockerComposeRedis2

dockerComposeRedis3

cdToUsercode

delGitCopyUpCreate

delGitCopyUp

delGitCopyUpMigrate

webPackerCh7

RSpec-Ch8

RSpec-Ch8_2

RSpec-Ch8_2_1

RSpec-Ch8_3

runRailsUsingCustomImage

dockerCompose1-copy

RSpec-Ch8_2-copy

delGitCopyUp-copy

RSpec-Ch8_5

RSpec-Ch8_6

RSpec-Ch8_6_GUI

dockerCompose1-copy-copy

dockerComposePostgres1

webPackerCh7-copy

postgress_last_lesson

Ch12_2

postgress_2nd_last_lesson

Ch12_3

gem_1

gem_2

irritation_1

irritation_1_1

Ch12_1

webPackerCh7_2

Cloud

Cloud_DO

Cloud_1

Cloud_2_1

Cloud_2_2

Cloud_2_4

RSpec-Ch8_2_new

RSpec-Ch8_7

Cloud_1_1_bucket

dockerComposeRedis3-copy

dockerComposeRedis2-copy

Cloud_DO_2

chap4_1

chap5_3

chap5_4

challenge

simpleJob2-ForceRelaunch

simpleJob-ForceRelaunch

RSpec-Ch8_5-copy

dockerCompose1-copy-copy-copy

testing

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chap5_3-copy

chap5_4-copy

dockerComposeRedis3-copy-iwrz0a

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

# Compose intermittently aborts with `Ctrl+C`

When you start your application with Compose in the default, attached mode-in other words, without the `-d` option, Compose connects to each container’s stdout, tailing the output.

When you press `Ctrl+C`, Compose is supposed to instruct the containers to
terminate by sending the main process the `SIGTERM` signal. The process should
exit gracefully and then the container should terminate. When this happens
correctly, the Compose output on pressing `Ctrl+C` is:
```text
Killing myapp_web_1 ... done
Gracefully stopping... (press Ctrl+C again to force)
```
However, instead of the containers shutting down gracefully, we get the following error and the termination fails, leaving the containers still running:
```text
^CERROR: Aborting.
```

Not good. Unfortunately, this seems to be a long-standing, known issue.

## Why does the error occur?
It seems to be caused by a problem in **PyInstaller**, an open source tool for creating executables from Python scripts, which Compose relies on.

## How to solve it
The issue is an irritation rather than a showstopper. 
We can manually shut
down the containers by issuing a `docker-compose stop` (or `kill`) command. However,
although it seems to be an issue with a third-party dependency, it cannot help
but undermine our feeling of confidence in Compose itself, which is a shame.

So far any 100% workable workaround to prevent it is not found. If you find yourself affected,  avoid starting your application in attached mode, and instead, always use detached mode with the `-d` option. To date, many haven’t experienced the issue with that.

Learn the ways to shut down the server gracefully.

Server Not Shutting Down Gracefully

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

Server Not Shutting Down Gracefully

Compose intermittently aborts with `Ctrl+C`

Docker for Rails Developer—Exam 1

Docker for Rails Developer—Exam 2

Docker for Rails Developer - Exam 3

Server Not Shutting Down Gracefully

Compose intermittently aborts with Ctrl+C

Compose intermittently aborts with `Ctrl+C`