salmanspice/blue-green-deployment

A project demonstrating a CI/CD pipeline using a Blue/Green deployment strategy using Jenkins, Docker and Kubernetes.

Blue Green Deployment

Project Summary

This project demonstrates a CI/CD pipeline using a Blue/Green deployment strategy using Jenkins, Docker and kubernetes/EKS (using eksctl).

The sample Flask web app used in this project is sourced from here.

Note: The pipeline relies on a kubernetes cluster pre-deployed outside of the pipeline. This implementation uses EKS and is deployed using eksctl.

Project Contents

• flask-app - sample Flask web app files
• infrastructure
  • deploy-eks.sh - script to deploy an EKS cluster using eksctl
  • cfn-template-sample/eks-cluster.yml - sample Cloudformation template of eks cluster stack
• jenkins
  • Jenkinsfile - jenkins pipeline configuration file
  • scripts - contains scripts for pipeline

Pipeline Workflow

Workflow found in jenkins/Jenkinsfile

Stages

• integration test
  • Performs lint tests on web app and Dockerfile in flask-app
    • uses scripts: install-dependencies.sh and lint.sh
• build image and push to repo
  • Builds docker image according to Dockerfile and uploads image to ECR repository
• run kubeconfig
  • Updates kubeconfig to allow for kubectl usage on eks cluster

Following stages only executes on commits made to blue branch

• deploy blue container to eks cluster
  • Deploys container to eks cluster using kubectl
  • uses scripts/deploy-container.sh
• update service to redirect traffic blue environment
  • Updates kubernetes service to point to blue containers
  • uses scripts/update-service.sh

Following stages only executes on commits made to green branch

• deploy green container to eks cluster
  • Deploys container to eks cluster using kubectl
  • uses scripts/deploy-container.sh
• update service to redirect traffic green environment
  • Updates kubernetes service to point to green containers
  • uses scripts/update-service.sh

Stage only executes when a commit is made to either the blue branch or green branch

• perform smoke test
  • Performs curl test to confirm succesful deployment
  • uses scripts/smoke-test.sh