Snapcommerce Infra Co-op Takehome Challenge

Description

In this challenge, you will take a legacy hello-world HTTP server application, containerize it using Docker, and deploy it to the cloud.

You do not need any previous experience with Ruby on Rails to complete this challenge, and no modifications or additions to the application code are necessary. You should be able to complete the challenge using a combination of the legacy application README below, previous experience, and online research. There is no time limit, but you should be able to complete it in less than 4 hours.

You may use any technologies or platforms you want, but you must containerize the application yourself and include a Dockerfile. If you incur any expenses during this challenge, we will reimburse you up to CAD$10. Send a receipt / screenshot of the expenses incurred to your recruiter 3 days after the stated due date.

Requirements

1. The application is containerized via a Dockerfile placed in the root of the project. If someone were to run docker build . it would complete successfully.
2. On every push to master:
   1. A docker image is built for the commit
   2. The test suite is executed inside a container launched using the image built in step 1
   3. Only if the test suite passes, the application is deployed/upgraded using the image built in step 1
3. The application is accessible over HTTPS over the public internet at an address provided by you at the root path. Eg. https://some-domain.somewhere.com/
4. The message displayed is "Hello world from production!". The last word in the message is controlled via the environment variable RAILS_ENV. Do not hardcode the value "production" into the application code or the built Docker image. Set the environment variable correctly at container launch time depending on your chosen platform / technology stack.

Bonus objectives

Presented in decreasing order of value. Do not implement all of these, one or two (or zero) is just fine.

• IaC (Infrastructure as Code): as much configuration as possible is stored in the git repo in text files, except for the value of RAILS_ENV
• Build step is fast, especially if nothing has changed in the library dependencies since a previous commit
• Zero downtime upgrades: the application is available all throughout the deployment process
• Scalable horizontally and vertically: your deployment can handle arbitrary levels of traffic simply by adjusting configuration and spending more money. Assume for the purposes of this objective that the message is not static (no caches in front of the application are allowed)
• Valid SSL certificate: No SSL warnings or errors in the latest version of Chrome, a padlock icon is displayed
• Local docker development: docker-compose.yaml file that allows developers to develop locally in a container
• Some other feature/improvement over the basic requirements that you'd like to highlight

Submission details and short-form questions

Submit your application to us by email as a g-zipped tarball (.tar.gz) of the repository root including the .git folder. Do not submit a pull request or otherwise make a public submission.

Your final submission should be on the master branch, without erasing or changing the existing commit history.

The application should be available at the URL you provided for 3 days past the stated due date.

Answer these questions in the README of your submission

1. What is the URL of the hosted application?

It listen on http://0.0.0.0:5000 I failed to upload it to a cloud server

1. Briefly describe the technologies/platforms used (besides Docker and RoR). Describe where in the git repo these technologies/platforms are configured. If there are technologies/platforms configured manually in a web GUI or similar, include screenshots of all of the configuration.

N/A, I tried to deploy it to heroku, but there are some error that I can not fix. For example, the heroku guideline ask me to deploy the image which is running, but the image I created for this app ennd in lest 1 second. I am not sure if it is something wroing with my code or not, because when I try to run the test suite on my own system, it ends really fast.

1. Did you achieve any of the bonus objectives? Which ones and how? Optionally, for any bonus objectives that were not completed, describe in 1-3 sentences how you would complete the objective given more time or money.

No

Legacy application README

Setup / prerequisites

Requires MRI Ruby v2.7.2

Requires bundler 2.1.4: gem install bundler -v 2.1.4

To install library dependencies: bundle install

Running the test suite

To run the test suite: bundle exec rspec -fd

Running the server

To run the http server bound to all interfaces and listening to port 5000: bundle exec rails server -b 0.0.0.0 -p 5000