AWS ECR - Elastic Container Registry Integration & EKS

Step-01: What are we going to learn?

We are going build a Docker image
Push to ECR Repository
Update that ECR Image Repository URL in our Kubernetes Deployment manifest
Deploy to EKS
Kubernetes Deployment, NodePort Service, Ingress Service and External-DNS will be used to depict a full-on deployment
We will access the ECR Demo Application using registered dns http://ecrdemo.kubeoncloud.com

Step-02: ECR Terminology

Registry: An ECR registry is provided to each AWS account; we can create image repositories in our registry and store images in them.
Repository: An ECR image repository contains our Docker images.
Repository policy: We can control access to our repositories and the images within them with repository policies.
Authorization token: Our Docker client must authenticate to Amazon ECR registries as an AWS user before it can push and pull images. The AWS CLI get-login command provides us with authentication credentials to pass to Docker.
Image: We can push and pull container images to our repositories.

Step-03: Pre-requisites

Install required CLI software on your local desktop
- Install AWS CLI V2 version
  - We have taken care of this step as part of 01-EKS-Create-Clusters-using-eksctl
  - Documentation Reference: https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2.html
- Install Docker CLI
  - We have taken of Docker local desktop installation as part of Docker Fundamentals section
  - Docker Desktop for MAC: https://docs.docker.com/docker-for-mac/install/
  - Docker Desktop for Windows: https://docs.docker.com/docker-for-windows/install/
  - Docker on Linux: https://docs.docker.com/install/linux/docker-ce/centos/
- On AWS Console
  - We have taken care of this step as part of 01-EKS-Create-Clusters-using-eksctl
  - Create Authorization Token for admin user if not created
  - Configure AWS CLI with Authorization Token

aws configure
AWS Access Key ID: ****
AWS Secret Access Key: ****
Default Region Name: us-east-1

Step-04: Create ECR Repository

Create simple ECR repository via AWS Console
- Repository Name: aws-ecr-kubenginx
- Tag Immutability: Enable
- Scan on Push: Enable
Explore ECR console.
Create ECR Repository using AWS CLI

aws ecr create-repository --repository-name aws-ecr-kubenginx --region us-east-1
aws ecr create-repository --repository-name <your-repo-name> --region <your-region>

Step-05: Create Docker Image locally

Navigate to folder 10-ECR-Elastic-Container-Registry\01-aws-ecr-kubenginx from course github content download.
Create docker image locally
Run it locally and test

# Build Docker Image
docker build -t <ECR-REPOSITORY-URI>:<TAG> . 
docker build -t 180789647333.dkr.ecr.us-east-1.amazonaws.com/aws-ecr-kubenginx:1.0.0 . 

# Run Docker Image locally & Test
docker run --name <name-of-container> -p 80:80 --rm -d <ECR-REPOSITORY-URI>:<TAG>
docker run --name aws-ecr-kubenginx -p 80:80 --rm -d 180789647333.dkr.ecr.us-east-1.amazonaws.com/aws-ecr-kubenginx:1.0.0

# Access Application locally
http://localhost

# Stop Docker Container
docker ps
docker stop aws-ecr-kubenginx
docker ps -a -q

Step-06: Push Docker Image to AWS ECR

Firstly, login to ECR Repository
Push the docker image to ECR
AWS CLI Version 2.x

# Get Login Password
aws ecr get-login-password --region <your-region> | docker login --username AWS --password-stdin <ECR-REPOSITORY-URI>
aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin 180789647333.dkr.ecr.us-east-1.amazonaws.com/aws-ecr-kubenginx

# Push the Docker Image
docker push <ECR-REPOSITORY-URI>:<TAG>
docker push 180789647333.dkr.ecr.us-east-1.amazonaws.com/aws-ecr-kubenginx:1.0.0

Verify the newly pushed docker image on AWS ECR.
Verify the vulnerability scan results.

Step-07: Using ECR Image with Amazon EKS

Review the k8s manifests

Understand the Deployment and Service kubernetes manifests present in folder 10-ECR-Elastic-Container-Registry\02-kube-manifests
- Deployment: 01-ECR-Nginx-Deployment.yml
- NodePort Service: 02-ECR-Nginx-NodePortService.yml
- ALB Ingress Service: 03-ECR-Nginx-ALB-IngressService.yml

Verify ECR Access to EKS Worker Nodes

Go to Services -> EC2 -> Running Instances > Select a Worker Node -> Description Tab
Click on value in IAM Role field

# Sample Role Name 
eksctl-eksdemo1-nodegroup-eksdemo-NodeInstanceRole-1U4PSS3YLALN6

In IAM on that specific role, verify permissions tab
Policy with name AmazonEC2ContainerRegistryReadOnly, AmazonEC2ContainerRegistryPowerUser should be associated

Deploy the kubernetes manifests

# Deploy
kubectl apply -f 02-kube-manifests/

# Verify
kubectl get deploy
kubectl get svc
kubectl get po
kubectl get ingress

Access Application

Wait for ALB Ingress to be provisioned
Verify Route 53 DNS registration ecrdemo.kubeoncloud.com

# Get external ip of EKS Cluster Kubernetes worker nodes
kubectl get nodes -o wide

# Access Application
http://ecrdemo.kubeoncloud.com/index.html

Step-08: Clean Up

# Clean-Up
kubectl delete -f 02-kube-manifests/