Cloud DevOps Capstone Project

Overview

This project aims to develop a CI/CD pipeline for microservices applications with blue/green deployment. The CI step includes a simple linter, and the CD steps include:

• Pushing the built Docker container(s) to the Docker repository
• Deploying these Docker container(s) to a small Kubernetes cluster using AWS Kubernetes cluster
• Building these steps in Jenkins pipeline

Steps

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• EC2 Instance with Ubuntu 18.04
• Install Jenkins & plugins

Jenkins plugins: 

Amazon Web Services SDK 
Ansible plugin
Ant plugin
Blue Ocean
CloudBees AWS Credentials Plugin
Docker Pipeline
GitHub Pipeline for Blue Ocean
Pipeline: AWS Steps

• Add IAM policy for blue/green deployment

• Add AWS credentials in Jenkins

• Add Docker credentials in Jenkins

• Install docker

• Install dependencies to deploy cluster with AWS EKS

• Create AWS keypair for cluster and create cluster using eksctl

• Create blue & green branches, each with the following files:

  • Dockerfile
  • Jenkinsfile
  • our "app": index.html

• Build Jenkins pipeline

Screenshots requirements

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Legit Linter

Breaking the code in index.html

BlueOcean view in Jenkins

Jenkins Console Output

CloudFormation Cluster

Blue Deployment

Green Deployment

Problems I ran into / Lessons Learned

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• Unable to push to docker using Jenkins, even after adding docker credentials to Jenkins. Finally found a way to have Jenkins use docker credentials with withDockerRegistry([ credentialsId: "dockerhub", url: "" ]).

• Installing kubectl on Ubuntu user instead of Jenkins user caused issues where Jenkins is unable to run kubectl commands. My workaround is using sudo su ubuntu -c to run it.

• Switching between blue and green app doesn't show at first, but later realized it must be cached. By switching to incognito, I was able to see the switch.