Amazon Virtual Private Cloud (VPC) is one of the core foundational services in Amazon Web Services (AWS). It allows you to create a logically isolated virtual network in which AWS resources can be launched. A VPC is created within a region and subnets are created within a region’s Availability Zones (AZs). In this guide, we’ll be using Terraform to create a simple nondefault VPC with public and private subnets, configure an Internet Gateway (IGW) to allow public subnets to connect to the internet and a Network Address Translation (NAT) gateway to allow resources that reside in private subnets to connect to the internet.

Kubernetes Pods use IP networking to interact with other resources within a cluster. Pods are, however, fungible resources; they assume a new identity when termintated and replaced. Kubernetes provides no guarantees that a Pods IP address will remain static if a controller replaces it. When a cluster state changes, it quickly becomes important to think about a service discovery layer that will facilitate communication between Pods in a cluster and connections from external resources.