Add Pod and Cluster auto-scaling example based on service requests-per-second using Karpenter, Prometheus, and Keda

Author: iankouls-aws

Container-Root/eks/deployment/csi/ebs/README.md

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+# EBS CSI Driver
+
+The [EBS CSI Driver](https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/docs/install.md) can be deployed using the `./deploy.sh` script provided here. The driver requires your instance role to have certain permissions which may not be granted by default. 
+If EBS volume provisioning is not working, please check that your instance role has the AmazonEBSCSIDriverPolicy added. 
+If you require snapshotting, install the [CSI Snapshotter Controller and CRD](https://github.com/kubernetes-csi/external-snapshotter).
+

Container-Root/eks/deployment/horizontal-pod-autoscaler/README.md

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+# Horizontal Pod Autoscaling
+
+The [Horizontal Pod Autoscaler](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/) is included in the base set of Kubernetes resources that comes included with any new cluster.
+
+The `hpa-example` folder contains a simple php-apache microservice which can be built and deployed to illustrate how HPA works. The example requires `metrics-server` to be deployed on the cluster. A script for that is provided in the `/eks/deployment` directory.
+
+[KEDA](keda.sh) is a Kubernetes Event Driven Autoscaler which works alongside standard horizontal pod autoscaler and enables scaling based on various events. Refer to the `keda` directory for deployment.
+

Container-Root/eks/deployment/horizontal-pod-autoscaler/example/Dockerfile

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+*.yaml
+*.sh

Container-Root/eks/deployment/horizontal-pod-autoscaler/hpa-example/.dockerignore

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+#!/bin/bash
+  
+export IMAGE=php-apache
+export TAG=:latest
+export REGION=$(aws configure get region)
+export ACCOUNT=$(aws sts get-caller-identity --query Account --output text)
+export REGISTRY=${ACCOUNT}.dkr.ecr.${REGION}.amazonaws.com/
+

Container-Root/eks/deployment/horizontal-pod-autoscaler/hpa-example/.env

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+./php-apache.yaml

Container-Root/eks/deployment/horizontal-pod-autoscaler/hpa-example/.gitignore

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+FROM php:5-apache
+COPY index.php /var/www/html/index.php
+RUN mkdir -p /var/www/html/php-apache; ln -s /var/www/html/index.php /var/www/html/php-apache/index.php; mkdir -p /var/www/html/hpa-example; ln -s /var/www/html/index.php /var/www/html/hpa-example/index.php
+RUN chmod a+rx index.php

Container-Root/eks/deployment/horizontal-pod-autoscaler/hpa-example/Dockerfile

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+#!/bin/bash
+
+source .env
+
+# Build Docker image
+docker image build ${BUILD_OPTS} -t ${REGISTRY}${IMAGE}${TAG} -f Dockerfile .
+