EKS Cluster w/ Secondary CIDR and Karpenter Configuration

Index

• Demo: AWS VPC CNI Custom Networking
  • About the Demo
  • 1. Create VPC with Secondary CIDR and Subnets
  • 2. AWS VPC CNI & ENIConfig configuration for Custom Networking
  • 3. Karpenter v1alpha Configuration
  • Demo Troubleshooting
• ec2-instance-selector CLI tool

ENI Custom Networking Demo

• Creates an EKS Cluster with a VPC with Secondary CIDR block.
  • Secondary CIDR block is a VPC feature that allows you to add additional IP addresses to your VPC.
  • We want to use the secondary CIDR block for the pods, and the default CIDR block of the VPC for the nodes.
  • Thus defeating the IP Exhaustion problem.
• Creates 3 Private subnets in the Secondary CIDR block with /19 mask, so we can have available IP count of 3*8190 or 24570 for our pods.
• Updates aws-node with Custom Networking configuration.
• Creates ENIConfig for each of our subnets in the Secondary CIDR block.
• Creates Karpenter Provisioner and AWSNodeTemplate.
• Offers troubleshooting steps for common issues.
• Recommends how to choose EC2 Instance Types.

Demo Diagram