Terraform Exercise

Outline

Here we have some terraform to build a simple VPC network, for now we have just one instance running the web server Nginx in its default configuration, serving up the default welcome page. This would be run with the following command:

terraform init && terraform apply -var-file=dublin.tfvars

We want this to be extended. You're tasked with making the alterations detailed below. After completing each stage, a test to show the things are still working would be to run the following command. Expect to see the Nginx welcome page HTML.

terraform output nginx_domain | xargs curl

Exercises

We want to be able to run the same stack closer to our customers in the US. Please build the same stack in the us-east-1 (Virginia) region, leaving the existing one in place too. Feel free to modify the code and or structure as much as needed in order to do this. You'll need to consider terraform state: each stack should have its own state, but don't feel you need to go as far as setting up remote state. As for a CIDR for the new VPC, use whatever you feel like, providing that it is compliant with RFC-1918 and does not overlap with the Dublin network.
Virginia has several availability zones: we want to use 4. However we still want to run the stack in Ireland using the 3 AZs there. Modify the Virgina stack to span 4 AZs. Do this however you like, but consider that we would like to see re-use of code.
The EC2 instance running Nginx went down over the weekend. It's been decided that we need a solution that is more resilient than just a single instance. Please implement a solution that you'd be confident would continue to run in the event one instance goes down.
We are looking to improve the security and segregation of our network. We've decided we would like private subnets that are not addressable on the internet. Modify the VPC to meet this requirement. The private subnets should still have egress internet connectivity.
Describe any general changes or improvements that you would make to this Terraform.

License

harryjubb/terraform-exercise

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