Continuing on the previous lab where I used Terraform to deploy resources, now with ALB and ASG added


Services Covered

  • terraform Terraform

Lab description

Create an advanced AWS VPC spanning 2 AZs with both public and private subnets. An internet gateway and NAT gateway will be deployed into it. Public and private route tables will be established. An application load balancer (ALB) will be installed which will load balance traffic across an auto scaling group (ASG) of Nginx web servers. Security groups will be created and deployed to secure all network traffic between the various components.

Project structure

├── ec2.userdata
├── main.tf
├── outputs.tf
├── terraform.tfvars
└── variables.tf

Learning Objectives

  • Create Terraform template to launch resources
  • Create AWS environment including VPC, subnets, EC2 instance, route table, internet gateway
  • Provide EC2 userdata from a separate file
  • Use cidrsubnet() terraform function

Lab date

14-11-2021


Prerequisites

  • AWS account
  • Terraform installed
  • KeyPair in EC2 (I called my cloudacademydemo)

Lab steps

  1. Start off with initializing terraform project in your directory
    terraform init
  2. Launch the terraform environment execution by running
    terraform plan

    lab47_plan

    The main template includes creating a new VPC with 4 subnets (two public and two private), an internet gateway, elastic ip for nat gateway, route tables, security groups, application load balancer, launch template.

  3. Deploy the resources by running
    terraform apply

    And paste your IP for SSH connection.

    lab47_applycomplete

    Alright! Now the two webserver instances are running behind an ALB.

    lab47_instances

    Navigate to the ALB’s DNS name to verify that nginx responses.

    lab47_nginx

  4. To wrap-up run the destroy command to clean-up the environment.
    terraform destroy

Lab files

Acknowledgements

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