Auto Scaling with Terraform

Welcome, fellow cloud adventurers! Today, we're diving deep into the dynamic realm of AWS Auto Scaling, guided by the mighty force of Terraform. Get ready to embark on an electrifying journey through the clouds as we unravel the secrets of scalable infrastructure in this captivating blog post

Introduction

In today's fast-paced computing landscape, the ability to swiftly adapt to fluctuating demands is paramount. Auto Scaling Groups (ASGs) emerge as a solution to this challenge by dynamically adjusting the number of instances in response to workload changes. In this guide, we'll delve into the setup and testing of Auto Scaling using Terraform, a versatile infrastructure as code tool, on the AWS cloud platform.

Creating an Auto Scaling Group with Terraform

Auto Scaling Groups are effortlessly crafted using Terraform, a go-to choice for managing infrastructure as code. Terraform allows us to define resources declaratively, simplifying the management and scaling of our infrastructure.

resource "aws_launch_configuration" "web_server_as" {
  image_id           = "ami-005f9685cb30f234b"
  instance_type      = "t2.micro"
  security_groups    = [aws_security_group.web_server.name]

  user_data = <<-EOF
              #!/bin/bash
              echo "<html><body><h1>You're doing really Great</h1></body></html>" > index.html
              nohup python -m SimpleHTTPServer 80 &
              EOF
}

resource "aws_autoscaling_group" "web_server_asg" {
  name                 = "web-server-asg"
  launch_configuration = aws_launch_configuration.web_server_lc.name
  min_size             = 1
  max_size             = 3
  desired_capacity     = 2
  health_check_type    = "EC2"
  vpc_zone_identifier  = [aws_subnet.public_subnet_1a.id, aws_subnet.public_subnet_1b.id]
}

Testing Auto Scaling

Once our Auto Scaling Group is established, verifying its functionality becomes imperative. This can be achieved by manipulating the desired capacity of the group and observing its response.

Navigate to the AWS Management Console and select our Auto Scaling Group. Increasing the desired capacity prompts the Auto Scaling Group to spawn new instances to meet heightened demand. After a brief interval, confirm the creation of these instances in the EC2 Instances service.

Conversely, reducing the desired capacity mimics a decrease in demand, leading the Auto Scaling Group to terminate surplus instances. Verify the termination of excess instances in the EC2 Instances service.

Conclusion

Auto Scaling Groups represent a robust mechanism for dynamically adjusting infrastructure size in line with evolving demand. Leveraging Terraform simplifies the management of Auto Scaling resources, ensuring seamless scaling of applications on AWS.

By following the steps outlined in this guide, you can confidently configure and test Auto Scaling for your applications, guaranteeing their responsiveness and cost-effectiveness across varying workloads.

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Auto Scaling with Terraform

Table of contents

Introduction

Creating an Auto Scaling Group with Terraform

Testing Auto Scaling

Conclusion

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Nehal Ingole

Nehal Ingole