Add a NAT Instance to our VPC with CloudFormation

In this post we’re going to talk about how to provision a NAT (Network Address Translation) Instance from scratch, using AWS Linux 2 and CloudFormation. We’re going to provision an auto-healing NAT, meaning an instance launched by an auto-scaling group with a desired capacity of 1, so if our instance crashes the auto-scaling group with terminate it for us and spin up a new one. This is much like the auto-healing Bastion Host I provisioned in a previous post, Provision a Bastion Host to our VPC with CloudFormation. So the CloudFormation template for this NAT Instance is very similar to the Bastion Host template, and this post will focus only on the differences.

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