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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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 
We have introduced a powerful new tool into our arsenal: **Docker Compose**. It really is a one-stop-shop command for developing our app with Docker.
 
Let’s review what we covered in this chapter: 

1. We introduced the `docker-compose.yml` and its format. 

2. We created our own `docker-compose.yml` for our Rails app, including a locally 
mounted volume to allow live editing of local files. 

3. We saw how to spin up our entire app and start the Rails server by using 
the `docker-compose up` command.

4. We learned various commands for managing our app with Compose: 
    * List running containers.
      ```text
      docker-compose ps
      ```

    * Manage the container life cycle. 
      
      ```text
      $ docker-compose [start|stop|kill|restart|pause|unpause|rm] <service name> 
      ```

    * View the logs.
       ```text
       docker-compose logs [-f] <service name>
        ```

    * Run a one-off command in a new, throwaway container. 

      ```text
       docker-compose run --rm <service name> <some command> 
        ```

    * Run a one-off command in an existing container. 

      ```text
      docker-compose exec <service name> <some command>
       ``` 

    * Rebuild an image. 
    
      ```text
      docker-compose build <service name>
      ```

By making use of this Compose goodness, we have replaced our more complicated `docker run` commands with something clean, easy to remember, and manageable. We can now launch our entire app from scratch with just a single command. Hurrah!  🎉

# What to expect in the next chapter?
Now it is time to start using Compose to extend the capabilities of our app by adding services. 


Let’s review what we have learned 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