Carmudi DevOps Engineer Exam

About us

Carmudi is a vehicle classifieds platform that operates in many countries. As a DevOps engineer you will be working with apps being used by millions of users monthly.

Goals

1. Develop your own microservices
2. Create a mechanism for automatic deployments

Problem

"Today's Featured Image"

This app has 2 components: image-service and viewer-service. image-service is a web microservice that has a single endpoint/function: to serve random 4x4 PNG images. viewer-service is a simple static site that shows a big "Today's Featured Image" text and then shows the image served by image-service.

Your task is to develop this app and implement CI/CD. The source code of the components is already provided.

Tasks

• Make sure that all your solutions are hosted on a public GitHub repository and that you are able to use git to record all your activity (Gitlab is not suitable for this as it has its own CI/CD that requires your own server)
• Update image-service code to accept this query parameter ?date=yyyy-mm-dd to view the featured image of any date specified (a certain date's image should stay the same across requests)
• Create a docker image for running both image-service and viewer-service (reusing existing Docker Hub images is highly encouraged)
• Create a docker-compose config to run both image-service and viewer-service on any local machine
• Implement CI/CD with Travis (travis-ci.com)
  • Travis should deploy the image-service docker container to Heroku (travis-support ootb) or sloppy.io or somewhere else - whatever you prefer
  • It should be deployed NOT as a PHP app but as a Dockerized app. Failure to do so results to failing the whole exam.
  • Travis should deploy the viewer-service static file to GitHub Pages (of the same repo) or Firebase Hosting or somewhere else - whatever you prefer
  • Note: Make sure to create simple tests for both services before deploying (integral for doing CI/CD)
• PRs submitted should be built first by Travis
• Create 2 PRs: 1 should have a passing build (there should be test/s that passed) and another should have a failing build (your test/s failed)
• Create a brief documentation of what you've done

Bonus

• Implement some form of security on image-service to prevent hotlinking
• Serve viewer-service under a CDN

References

• PHP - built-in web server
• PHP - accepting URL parameters
• PHP - mt_srand
• Docker
• Docker Compose
• Travis
• Travis - Heroku deployment
• Travis - GitHub Pages deployment
• Travis - Script deployment
• GitHub pull requests

(c) Carmudi 2018+