In part II, here what you will learn:

• Configuring AWS EC2 Userdata with Terraform
• Setting Up VSCode SSH Configuration
• Utilizing Terraform Provisioners
• Installing Docker on EC2 before deploying
• Replacing Resources and Deploying EC2 with Terraform
• Working with Terraform Variables
• Using Terraform Conditional Expressions
• Basics of Terraform Outputs

Part II:

Launching an AWS EC2 Instance with Terraform

• Google “AWS EC2 resource in terraform”. You should land on the section in the terraform documentation that mention AWS EC2.
• Go back to VS Code and add the block to main.tf in the Terraform directory.
• Enter the necessary information needed to create a VPC.

• Run terraform plan, then terraform apply -auto-approve. You should see a new resource.
• Reorganize the code in main.tf

Configuring AWS EC2 Userdata with Terraform

• Add userdata to our content to boostrap our instance. Boostrap goes over instance for docker to be ready.
• Create a new file named userdata.tpl

• Add it to the resource “aws_instance”

• Run terraform plan, then terraform apply -auto-approve. You should see a new resource.
• Go to EC2 dashboard to verify.

• Or run terraform state list

• Run terraform state show aws_instance.dev_node

• Copy and save the public IP address to connect “44.202.189.9”

• Connect to the instance:ssh -i ~/.ssh/keypairname username@ippublicaddress

• When connected, verify if docker is installed

Setting Up VSCode SSH Configuration

• Go to the extension, and search for “Remote — SSH”. Install it.

• Go back to explorer and type:cat ~/.ssh/config
• Create a file named “windows-ssh-config.tpl

• Create another file for linux named “linux-ssh-config.tpl

Utilizing Terraform Provisioners

• Go back to main.tf, under resource “aws_instance” enter this code

• Runterraform state list
• Runterraform apply-replace aws_instance.dev_node

• Enter Y.
• Go to your console and verify if itt’s working.

• Enter cat ~/.ssh/config, you should get a correct result.

Installing Docker on EC2 before deploying

• In VS code, go to view. Click on Command palette, then ssh. Check the IP address and click on it.

• Select Linux, and click OK.

• Open terminal and run docker
• Run docker --version

• Click “Yes, I trust the authors”.

• You’ve deployed a DEV environment using Terraform, and accesible via SSH remote. You can stop the lab here.

BONUS: Or you can continue the lab.

Let’s try to optimize what I did. I am going to modify couple of scripts to adjust everything.

Replacing Resources and Deploying EC2 with Terraform

• Modify the type of OS we are using. Change windows in the provisioner so that it can be useful when using other operating systems.

• Use the interpolation syntax: $ { } which is a calculated variable used
• Create a new file named “variables.tf”
• Go to the terraform document. Search for “Declaring an input variable”
• Copy the code and enter the necessary changes

• Save the file.
• Run terraform destroy -auto-approve. Enter windows when a value is requested.

Working with Terraform Variables

• The system is requesting to define var.host_os
• Create a new file named “terraform.tfars” with the following details

• Create a another file named “dev.tfars” with the following details

• Run the following command: terraform console -var-file=”dev.tfars”, then enter the variable

Using Terraform Conditional Expressions

• Run the following command: terraform console -var=”host_os=windows”, then enter the variable

• You realize you should set or change the interpreter by integrating variables.

• Run terraform plan, then runterraform apply -auto-approve.
• If nothing change, run terraform plan -refresh-only.

Basics of Terraform Outputs

• Launch terraform console, and type aws_instance.dev_node.public_ip to view IP address.
• Create a new file “outputs.tf”

• Run terraform apply -refresh-only.

• Run terraform output.to see the final result.

This is how you can optimize your terraform script with variables and outputs. This is the end.

Thank you for reading and/or following along! Leave us a clap or a comment. Please stay tuned for all my upcoming projects.