final-capstone's Introduction

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.

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