forevertga / devops-exercise

DevOps Exercise

Process

• Fork this repository to your personal GitHub account. If you prefer, you may create your own private repository instead.
• Complete your project and push your code to your repository.
• Send a link to your public repo to [email protected] or invite @sachatememe, @Mike and @AlexeyGolubeff as collaborators if it is private.
• We will schedule the final interview to review and discuss.

Project Requirements

Overview

Write Terraform that can be used to deploy the three-tiered "click counter" application contained in this repository. Use the front, back, and redis images detailed below.

• Use Dockerfile in the front directory of this repo to build front image
• Use Dockerfile in the back directory of this repo to build back image
• Push built images to free container registry like Dockerhub, Github Packages, or AWS ECR
• Use any version of redis from Dockerhub
• Use AWS free-tier option(s) like EC2 and/or Lambda + API Gateway for running containers
• Use Terraform, your choice of CI/CD solution, and/or any additional scripting to deploy the containers

If you have questions or something seems "not right", please reach out via email.

Application details

• back app

  • Requires these ENV vars:
    • REDIS_SERVER - Address of Redis container in the form of <host>:<port>
  • Binds to port
    • 4000
  • Provides these endpoints:
    • /api/clicks - Returns current click count
    • /api/clicks/incr - Increments click count by 1 and returns new click count
    • /api/ping - Returns static "pong" response

• front app

  • Requires these ENV vars:
    • BACKEND_API_URL - Address of the Back container reachable from the server-side in the form of http://<host>
    • CLIENT_API_URL - Address of the Back container reachable from the client-side in the form of http://<host>
    • Note: depending on how you've networked the containers, these to vars could be the same
  • Binds to port
    • 3000
  • Provides:
    • / - Click counter display/UI
    • /ping - Returns static "pong" response

• redis image

  • Requires these ENV vars:
    • None
  • Binds to port
    • 6379

Extra credit

• Hide the 3000/4000 ports and make the service available over port 80 using the method of your choice
• Add healthchecks to front and back apps using the ping endpoint each app provides
• Implement basic security measures
• Add DNS or other customizations

Example

https://devops-exercise.tblk.us

Interview

During your online interview, we will:

• Walk through your solution and use it to deploy the application
• Discuss any challenges and successes of your implementation
• Cover additional questions, both technical and otherwise
• Answer any questions you may have