Down to dirty blog on setting up VPC with terraform.

This is to setup a new VPC in ap-south-1 with three public and three private subnets. It'll also take care of NAT Gateways, Internet Gateways, etc.

What the script does/creates:

  • There is 1 vpc in ap-south-1
  • There are 3 Availability zones, marked as 1a,1b,1c. To take advantage of multi AZ setup, we've 1 private subnet and 1 public subnet in each AZ. (total 6 subnets)
  • Each private subnet needs to talk to internet via NAT gateway. We're using 1 NAT gateway per AZ.
  • The script takes care of appropriate route table associations and ACL rules.
  • To launch an internal services like kibana, sentry, etc. and public facing Load balancers we use public subnets.
  • For the rest, we use private subnets for all services that aren't exposed to internet, databases, etc.

Terraform Files are here:

Put them all in a folder, change terraform.tfvars with your own AWS credentials.
Do terraform init, terraform plan, terraform apply say yes once you see what's being created.