Kubernetes Demos

Introduction

This repo contains a number of simple scenarios that help demonstrate Kubernetes concepts and tools. See the README file in each subdirectory for more information on running each scenario.

Prerequisites

All scenarios in this repo require PowerShell Core, as this allows you to run them on either Windows or Linux.

What's new

Folder	Description
install-oci-cli	Install and configure the Oracle CLI tool. This is required to create and manage a OKE cluster.
vertical-pod-autoscaler	Scale workloads by allocating more resources to them using Vertical Pod Autoscaler.
eksctl-create-cluster-karpenter-on-fargate	Build an EKS cluster where Karpenter runs on Fargate.
deploy-k8s-resources-using-terraform	Deploy native Kubernetes resources using Terraform.
node-overprovisioning	Prevent your production workloads from suffering latency when adding new nodes by provisioning a hot spare.

List of scenarios by function

Getting Started

Folder	Description
install-aws-cli	Install and configure the AWS CLI tool. This is required for any scenarios specific to EKS.
install-azure-cli	Install and configure the Azure CLI tool. This is required to create and manage an AKS cluster.
install-gcloud-cli	Install and configure the Google CLI tool. This is required to create and manage a GKE cluster.
install-oci-cli	Install and configure the Oracle CLI tool. This is required to create and manage a OKE cluster.
install-eksctl	Install the EKSCTL utility. This is used to create and manage an EKS cluster.
export-kubeconfig	Recreate your kubeconfig file if it becomes corrupted or is pointing to the wrong cluster. kubeconfig is used by kubectl to connect to your cluster.

Building a Cluster

Folder	Description
eksctl-create-cluster-with-autoscaler	Build an EKS cluster using EKSCTL with cluster autoscaler enabled.
eksctl-create-cluster-with-karpenter	Build an EKS cluster using EKSCTL with Karpenter deployed as the node autoscaler.
eksctl-create-cluster-karpenter-on-fargate	Build an EKS cluster where Karpenter runs on Fargate.
aks-create-cluster-with-autoscaler	Build an AKS cluster using the Azure CLI tool with cluster autoscaler enabled.
gke-create-cluster-with-autoscaler	Build a GKE cluster using the Google CLI tool with cluster autoscaler enabled.

Pod Placement

Folder	Description
assigning-pods-to-nodes	Assign pods to specific nodes by hard coding, nodeSelector, or node affinity.
taints-and-tolerations	Drive pods away from certain nodes using taints. Use taints, tolerations, and node affinity together for powerful, fine-grained control of pod placement on nodes.
bin-packing-mostallocated	Use bin packing in EKS, AKS, and GKE by deploying a custom scheduler with MostAllocated node scoring algorithm enabled.
pod-affinity	Ensure related workloads get deployed together on the same nodes using pod affinity. COMING SOON

Pod Autoscaling

Folder	Description
horizontal-pod-autoscaler	Scale workloads by adding replicas using Horizontal Pod Autoscaler.
vertical-pod-autoscaler	Scale workloads by allocating more resources to them using Vertical Pod Autoscaler.
keda-demo	Scale workloads based on application metrics using Kubernetes Event Driven Autoscaler (KEDA). COMING SOON

High Availability

Folder	Description
pod-disruption-budgets	Prevent critical workloads from being impacted by routine maintenance with Pod Disruption Budgets.
pod-topology-spread-constraints	Support High Availability Kubernetes implementations by ensuring pods are evenly distributed across availability zones.
node-overprovisioning	Prevent your production workloads from suffering latency when adding new nodes by provisioning a hot spare.

Observability

Folder	Description
install-kube-prometheus-stack	Install kube-state-metrics, node exporter, Prometheus, Grafana, and several Grafana dashboard using the kube-prometheus-stack Helm chart

Policy

Folder	Description
gatekeeper-policy	Use Gatekeeper and OPA to require all pods to have Requests and Limits defined.
kyverno-policy	Deploy and use Kyverno to enforce policy in your cluster. COMING SOON

Miscellaneous

Folder	Description
fargate-profile	Create a Fargate profile for EKS that runs all workloads for a particular namespace on Fargate serverless nodes.
deploy-k8s-resources-using-terraform	Deploy native Kubernetes resources using Terraform.