Taking a Service to Production

This devops challenge's goal is simple - build a full integration, deployment and monitoring pipeline for a service. It will allow you understand the challenges we face in ClimaCell everyday, and to demonstrate your skills.

We look at the pipline as consisting of three stages:

1. Continuous Integration - Any change in the repository that is pushed is automatically built as a docker container and published to a docker registry.
2. Continuous Deployment - Latest docker image deployed to a container platform and available to use.
3. Continuous Monitoring - The service health status is always available, and alert is sent when the service is not functioning. Logs are delivered and available.

Required solution:

The exercise is focused on the CI and CD stages.

• Create a full Continuous Integration and Continuous Deployment processes as defined above.
• The outcome should include:
  • Configuration / script files as part of the repository.
  • Permissions to the repository, where we can commit changes, and see that the pipeline was triggered and new docker was uploaded to the registry.
  • URL/IP of the deployed service - so we can check it over http.
  • Access to CI tool that we can access and see the pipeline in (OPTIONAL).
  • Access to the deployment environment where we can see the deployed artifact (OPTIONAL).
• • Bonus: Continue to Continuous Monitoring process as defined above (Use the /health endpoint in addition to logs).

Prerequisites

This github repository is a NodeJS demo app of a very small users service. Below are the instructions of how to build, run and use this service.

Build

npm install

Run

npm run start

Use

http://localhost:3000/users

GET - lists the list of existing users

• Response:

[
    {
        "_id": "5c20ca1d2cdc846b4de1f6ab",
        "name": "u1",
        "date": 1545652765281
    },
    {
        "_id": "5c20ca81c23ea46b5089884b",
        "name": "u2",
        "date": 1545652865843
    }
]

POST - add a new user

• Body: new user name

{
    "username":"<username>"
}

• Response: created user, including ID, and created date:

{
    "name": "<name>",
    "date": 1545657494671,
    "_id": "5c20dc96e4f6066bc12ab11e"
}

http://localhost:3000/health

GET - report on health of the service

• Response:
  • In case all OK: Status:200 Headers: System-Health:true
  • If error occurs: Status:200 Headers: System-Health:false Body: Information about the error in json:

  {
      "status": "DB Down"
  }

Config

The users service works with a MongoDB to store its users.

Database name: devops-exercise

Collection name: users

Environment Variables

MONGO_URI - uri of the mongo DB

Guidelines:

• Although this "users service" is very small and focused, we should be prepared for multi-environments (dev, staging, production, etc...) with full pipeline (including testing, linting, and more...) in the future. Make sure your solution is opened for such future changes.

• Use whichever CI/CD tool you want.

• Use GCR (Google Container Registry) as the docker registry and GKE (Google Kubernetes Engine) as the docker platform.

• Work on local github repository.

• Make sure the solution is private, not public. Only available for you and us.

• Consider using managed services. For mongo you may use Atlas - https://www.mongodb.com/cloud/atlas.

• For the sake of the exercise, /health endpoint randomly returns that the health is false.

• For simplicity, the service logs all the requests to the console.

Don't hesitate to contact us with any question.

Good Luck!

The ClimaCell Team