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DevOps Pairing Exercise

Goal

Automate the creation of a web server, and provide a healthcheck script to verify the server is up and responding correctly.

The Task

You are required to provision and deploy a new service in AWS. It must:

  • Be publicly accessible, but only on port 80.
  • Run Nginx.
  • Serve a /version.txt file, containing only static text representing a version number, for example:
1.0.6

Prerequisites

AWS creds/VPC and S3 bucket names etc will be provided when the exercise begins.

Mandatory Work

Fork this repository.

  • Provide instructions on how to create the server.

  • Bootstrap and provision the server however you wish. Use user-data or a configuration management tool (such as Puppet, Chef or Ansible). Alternatively launch an idempotent AMI with packer and terraform, or even via the console. Be prepared to justify your decision!

  • Provide a heatlhcheck script that can be run externally to periodically check if the server is up and serving the expected version number.

  • Alter the README to contain the steps required to:

    • Create the server.
    • Run the healthcheck script.

Give github users aeells|schmiegelow access to your fork. Feel free to ask questions as you go if anything is unclear, confusing, or just plain missing.

Extra Credit

This exercise is time-boxed, but if any of these shortcut the process by making it easier in the long-run they might be worth considering up front. We won't mark you down for not doing the extra credits, but if you want to give them a go...

  • Make the service resilient in 2 availability zones.

  • Run Nginx inside a Docker container.

  • Use the healthcheck script to start Nginx if it is not running.

      For example, you might decide to modify the script to SSH in to the instances and start if needed.
  Alternatively you might configure a process manager to use the script on the hosts themselves,
  such as supervisord or plain old systemd.

Questions

What scripting languages can I use?

Any you like. You’ll have to justify your decision. We use Bash, Python, Groovy and JavaScript internally. Please pick something you're familiar with, as you'll need to be able to discuss it.

What will you be grading me on?

Scripting skills, elegance, understanding of the technologies you use, security, documentation.

Will I have a chance to explain my choices?

Hopefully this will emerge as we pair and converse. But feel free to comment your code, or put explanations in a pull request within the repo.