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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challenge1

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cdToUsercode

delGitCopyUpCreate

delGitCopyUp

delGitCopyUpMigrate

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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

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Ch12_1

webPackerCh7_2

Cloud

Cloud_DO

Cloud_1

Cloud_2_1

Cloud_2_2

Cloud_2_4

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Cloud_1_1_bucket

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dockerComposeRedis2-copy

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

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

# Manually connecting to the Redis server 

We have just started Redis using Compose and have seen from the output that it is running. However, since we are still getting familiar with Docker, let’s manually connect to the Redis server and interact with it to prove to ourselves that it really does work.

# Using Redis command-line interface
A quick way to do this manually is by using the Redis command-line interface `redis-cli`. We can leverage the same `redis` image that already has `redis-cli` installed. Handy!
 
Rather than having to set up a new, separate service in Compose, we can piggyback on the existing `redis` service, since it uses the `redis` image we need. We can run `redis-cli` and connect to our Redis server with the following command: 
```text
$ docker-compose run --rm redis redis-cli -h redis
``` 
## Command explanation
This command says, “In a throwaway container (`--rm`) for the `redis` service, run the command `redis-cli -h redis`.” On running it, you will be able to see the standard Redis prompt showing the hostname and port it’s running on.

# 🍀 Practice

Feel free to play around in the terminal below. For example, try running the `ping` command, which should give you the **"PONG"** response. When you’re done, exit with the command `quit`. This will terminate the Redis client and, as a result, the container. 

Also, run the following command after `quit`:
```text
docker network ls
```
This will provide you with the list of networks created.



In this lesson, we will manually connect to the Redis server using a command.

Making a Manual Connection to Redis Server

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

Making a Manual Connection to Redis Server

Manually connecting to the Redis server