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AWS Infrastructure as Code Networking Architecture

Udacity Cloud DevOps Engineer Nanodegree Program - Challenge AWS IaC Networking Architecture

Project Overview

You have been tasked with creating the required Infrastructure-as-code scripts for a new cloud environment in AWS. The Lead Solutions Architect for the project sends you the following diagram.

Architecture

Architecture

ToDo

Write a CloudFormation script that:

  • Creates a VPC
    • It will accept the IP Range -also known as CIDR block- from an input parameter
  • Creates and attaches an Internet Gateway to the VPC
  • Creates Two Subnets within the VPC with Name Tags to call them “Public” and “Private”
    • These will also need input parameters for their ranges, just like the VPC.
  • The Subnet called “Public” needs to have a NAT Gateway deployed in it
    • This will require you to allocate an Elastic IP that you can then use to assign it to the NAT Gateway.
  • The Public Subnet needs to have the MapPublicIpOnLaunch property set to true. Use this reference for help.
  • The Private Subnet needs to have the MapPublicIpOnLaunch property set to false.
  • Both subnets need to be /24 in size.
    • If you need assistance with IP math, you can use a subnet calculator such as this one.
  • You will need 2 Routing Tables, one named Public and the other one Private
  • Assign the Public and Private Subnets to their corresponding Routing table
  • Create a Route in the Public Route Table to send default traffic ( 0.0.0.0/0 ) to the Internet Gateway you created
  • Create a Route in the Private Route Table to send default traffic ( 0.0.0.0/0 ) to the NAT Gateway
  • Finally, once you execute this CloudFormation script, you should be able to delete it and create it again, over and over in a predictable and repeatable manner, this is the true verification of working Infrastructure-as-Code

Setup

Create stack

aws cloudformation create-stack --stack-name udacity-challenge --template-body file://iac.yml --parameters file://parameters.json

Update stack

aws cloudformation update-stack --stack-name udacity-challenge --template-body file://iac.yml --parameters file://parameters.json