Micro-services CI+CD Pipeline using AWS & Kubernetes (EKS)

What is a micro-service

Executable code focusing on one business capability

• Built independently of other code
• Can be deployed independently of other code

What is CI

Fail fast, fail early, do Good

• Commit code several times a day (new features as well as fixes)
• Automatic & reliable testing
• Fix issues earlier
• Need DevOps to establish the pipeline & scale it for Enterprise
• We will use Jenkins

What is CD

Automation with a human touch

• Automate deployment to all environments (needs effective config management)
• Build in manual gates as per organization culture & target customer
• Monitor effectively

Demonstration

Set up a Kubernetes cluster in AWS a.k.a. EKS

* Install aws cli, eksctl, kubectl
    Refer to https://docs.aws.amazon.com/eks/latest/userguide/getting-started-console.html
* Create your Amazon EKS cluster IAM role & user
* Configure AWS cli & Setup SSH keys
    Refer to https://github.com/manug2/cloud-service-dev-recipe/blob/master/1_create-key-pair_steps.md
* Install new EKS cluster using 'eksctl' & configure
    Refer to https://github.com/manug2/cloud-service-dev-recipe/blob/master/2_create-eks-cluster.md

Set up Storage for Jenkins

Refer to

https://github.com/manug2/cloud-service-dev-recipe/blob/master/3_aws_add_persistent_storage.md

FYI, my steps follow Marcel Dempers' work

https://github.com/marcel-dempers/docker-development-youtube-series/tree/master/jenkins/amazon-eks/readme.md

Set up Jenkins on our cluster

* Install Jenkins on k8s and setup Kubernetes plugin in its console (Manage Jenkins)
Refer to 
    https://github.com/manug2/cloud-service-dev-recipe/blob/master/4_aws_jenkins_deployment.md
* Install Pipeline Maven Integration Plugin (Manage Jenkins -> Plugin Manager)
* Add Maven (Manage Jenkins -> Global Tool Configuration)
    * Note down Name for use in pipeline step 
* Restart Jenkins

Start Coding with CI

* Set up a git repo (if not done)
    * Code a micro-service
    * Add automated unit tests
    * Check it compiles and passes unit tests
* Add Jenkinsfile with steps to automate build
    * Add step for maven build
    * Add Dockerfile
    * Add step for docker build
* Commit to git
* Add Multibranch Pipeline (New Item) 
    * Input github repo link 
    * Choose to build for All branches in Discover branches)
* Watch Jenkins build (run on k8s ephemeral jenkins slave pods)
* If something does not work, fix and commit until build is SUCCESS.

Do the CD

* Add automated regression test pack
* Add k8s delpoyment yaml
* Add k8s service yaml (load balanced and exposed as a service)
* Add jenkins steps to automate deployment to k8s (load balanced and exposed as a service)
* Commit
* Watch Jenkins build & deploy (run on k8s ephemeral jenkins slave pod)
* Test the api using browser

Add new application to the pipeline CICD

* Add a simple HTML ui
* Add jenkins steps to automate build of ui
* Add jenkins steps to deployment of ui
* Commit
* Watch Jenkins build & deploy (ephemeral jenkins slave pods)
* Test UI - API interaction