DevOps Engineer Capstone Project

Capstone project of the Cloud DevOps Engineer Nanodegree at Udacity, showcasing the use of several CI/CD tools and cloud services covered in the program Udacity - AWS Cloud DevOps Engineer.

Introduction

This project deploy a simple Node express application using CircleCI and a Kubernetes (K8S) cluster deployed in AWS EKS:

• Building CircleCI pipelines to implement Continuous Integration and Continuous Deployment
• Using AWS, Ansible and CloudFormation to deploy clusters
• Building Kubernetes clusters
• Building Docker containers in pipelines

Project

The project build a Docker image and then run it in a Kubernetes cluster.

The project includes the following main tasks:

• Test the project's code using linting: make lint
  • Lints shell scripts, Dockerfile and Javascript code
• Create a Dockerfile to containerize the Nodejs application: Dockerfile
• Deploy to a public Docker Registry:
  • The containerized application: hello-world
• Deploy a Kubernetes cluster
• config cluster using Ansible

The CircleCI pipeline(config.yml) will execute:

• Code lint
• Build and publish the Docker container image
• Deploy K8s and management stacks
• Deploy newest Docker Image

Linting

Linting is used to check if the Application and Dockerfile is syntactically correct, making sure that the code quality is high. This project uses ESLint and Hadolint.

• output when lint passes:
• output when lint fails:

List of deployed Stacks

List of deployed Instances

CircleCi Pipelines

Run a CircleCi Pipeline to test and deploy changes to the Cluster using Ansible.

Pipeline workflow:

Access the Application

Check the deployments after the EKS Cluster has been successfully configured using Ansible within the CI/CD Pipeline using kubectl:

Access the app using Public LB DNS: http://ab3f63419d5f94c47bc90793e46b51e5-1326747092.us-east-1.elb.amazonaws.com/

Tools and Services used

• Circle CI: CI/CD service
• Amazon AWS: Cloud services
• AWS EKS: Amazon Elastic Kubernetes Service
• AWS eksctl: CLI for Amazon EKS
• AWS CLI: CLI for AWS
• CloudFormation: AWS Infrastructure as Code tool
• kubectl: a CLI tool to control Kubernetes clusters
• Docker Hub: docker image repository service

Notes

Setup

The project uses:

• circleci/docker orb to build and publish images.

  • DOCKER_LOGIN
  • DOCKER_PASSWORD

• circleci/aws-cli to deploy AWS stacks.

  • AWS_ACCESS_KEY_ID
  • AWS_SECRET_ACCESS_KEY
  • AWS_DEFAULT_REGION

• a kvdb bucket

Main Files

• Makefile: the main file to execute install and linting steps
• config.yml: run CI and CD
• index.js: the Nodejs application
• Dockerfile: the Docker image's specification file