This is a simple set of files to launch an Apache web server running in an AWS EC2 instance. This approach uses a remote state which is stored inside an S3 Bucket and also a lock, for concurrency management. The lock is managed by a table in AWS Dynamo BD.

After setting up the bucket and the table, an EC2 instance will be created and a security group will be added. It allows access only on ports 443 and 80.

Also, it sets up alarms in AWS CloudWatch for when CPU utilization reaches more than 80%. When this happens, an email is sent to a recipient using AWS SNS. Also, when the CPU level goes back to "normal", another email is sent.

Many parameters are configured using Terraform variables. Please, check all the terraform.tfvars files and the dev_eucentral1/backend.tf file to properly set your custom values.

After a successful terraform apply, the EC2 public IP address will be printed.

Although the Terraform version wasn't enforced by any .tf file, using v0.15.3 worked well.

Also, you certainly must have an AWS account. One way to make Terraform properly communicate with your account is to install the AWS CLI and run aws configure. Check this guideline for getting more instructions for your system.

After checking all the terraform.tfvars files and the dev_eucentral1/backend.tf file, and update them with your custom values, you can:

1. Create the S3 bucket and the Dynamo DB table:

   $ cd remote_state/
   
   $ terraform init
   
   $ terraform apply
   

2. Launch the webserver:

   $ cd ../webserver/
   
   $ terraform init
   
   $ terraform apply
   

3. From the output of the last command, check if the webserver was launched:

   $ curl <webserver_public_IP>