Infrastructure as Code (IaC) with AWS, Terraform, and Ansible

Introduction

 

IaC (Infrastructure as Code) is a concept now widely adopted in IT automation and resource management.

Infrastructure as Code (IaC) is the practice of managing and automating IT infrastructure with code instead of manual work. With IaC, infrastructure resources such as servers, networks, and databases are defined and managed through code, enabling fast, consistent, and repeatable provisioning.

Infrastructure automation is changing the way we manage and scale IT environments. It makes operations more efficient, repeatable, and secure. 

The cloud as an enabler 

The cloud was a matter of debate fifteen years ago. Today it comes up less and less, not because it matters less, but because its many benefits are now clear. Scalability, distribution, flexibility, security: a cloud infrastructure has many strengths. With the rise of artificial intelligence and the need for ever more powerful CPUs, companies that still keep their data on their own servers will be driven to migrate, if they have not already. Amazon Web Services (AWS) is a cloud computing platform that offers a wide range of services, including storage, compute, databases, and networking. Since its launch in 2006, AWS has transformed the IT industry, offering more than 200 services and a flexible cost structure based on economies of scale. AWS is organized into geographic Regions and Availability Zones, which provide high availability and resilience. This article is not about the cloud or AWS services, of course. But to make the discussion concrete and give an example of Infrastructure as Code, we chose a use case built on the AWS cloud, since Miriade is an AWS Advanced Consulting Partner in Italy: one of the few with the Amazon RDS Delivery validation, with 20 types of certifications, more than 70 completed projects, and among the first Italian partners.

Infrastructure as Code (IaC)

Let's look more closely at what IaC means. It is a methodology for managing infrastructure provisioning through code, with no need for manual configuration. This approach offers many benefits, including the ability to version the infrastructure, automate deployment processes, and ensure consistency across environments.

Here are some reasons to consider this method.

1. Efficiency: it automates repetitive, routine operations, which is where errors tend to occur.
2. Consistency: it ensures a high degree of consistency across development, test, and production environments.
3. Versioning: it makes changes traceable through version control systems such as Git.
4. DevOps automation: it integrates with CI/CD pipelines to automate deployment.

About Terraform

Terraform is an open source infrastructure provisioning tool developed by HashiCorp. It uses a declarative language (HCL) to define the desired infrastructure and manages the entire resource lifecycle. Its main features are listed below.

• Providers: Terraform supports many cloud providers, including AWS, Azure, Google Cloud, and many others.
• State management: Terraform manages the state of the infrastructure, so the resources it creates can be tracked.
• Modularity: reusable modules can be created to standardize configuration.
• Execution plan: before applying changes, Terraform shows a detailed execution plan so they can be reviewed.

When using this tool, it is also worth keeping a few best practices in mind. They help ensure good results as well as smooth collaboration among the development teams involved. Here is the recommended approach.

1. Code organization: split the infrastructure into clear, reusable modules.
2. State versioning: use remote backends to store state securely.
3. Automation: integrate Terraform into CI/CD pipelines to automate deployment processes.
4. Documentation: keep configuration documentation up to date to simplify maintenance and troubleshooting.

An example of using Terraform with AWS

Terraform integrates closely with AWS and can manage resources such as Amazon EC2, Amazon S3, Amazon RDS, and many more. Here is a basic configuration example:

provider "aws" {
  region = "eu-west-1"
}
resource "aws_instance" "example" {
  ami           = "ami-0c55b159cbfafe1f0" # AmazonLinux VM Id
  security-groups = ["sg-0123456789"] # Associated SecurityGroup Id
  subnet_id = "subnet-abcdefghij" # Associated Subnet Id
  instance_type = "t2.micro"
  tags = {
    Name = "example-instance"
  }
}

This simple script creates an EC2 instance in the specified Region. Terraform will handle the creation, update, and deletion of this resource, ensuring that the infrastructure always matches the definition in the code.

The webinar on IaC and infrastructure automation

In June 2024, together with AWS, we held a webinar that first gave an overview of the IaC methodology and then focused, with a demo, on using Terraform on AWS. The recording is available below, followed by a summary.

Watch the webinar recording (in Italian).

 

 

 

Infrastructure automation with IaC and Terraform is therefore a key step toward effective DevOps practices. By adopting these technologies, companies can significantly improve how they manage and scale their IT environments, while reducing the risks of manual configuration. For teams new to these practices, starting with Terraform and AWS provides a solid foundation for building robust, scalable infrastructure.

Infrastructure automation with IaC, Terraform, and Ansible

Infrastructure automation is changing how organizations manage and scale their environments. Besides Terraform, tools such as Ansible play a key role in provisioning and managing resources. In this section, we look at how CloudFormation and Ansible together enable fast infrastructure recovery after human error, and how both integrate with AWS.

CloudFormation and Ansible: a strong combination

CloudFormation

AWS CloudFormation lets you define your entire infrastructure as code (IaC) using YAML or JSON templates. You can then create and manage AWS resources in a repeatable, scalable way.

Ansible

Ansible is an open source automation tool that simplifies configuration management and application deployment. It uses playbooks written in YAML to define the tasks to run on target servers, keeping the infrastructure consistent and easy to restore.

Benefits of automation with CloudFormation and Ansible

1. Fast recovery: after human error, the infrastructure can be recreated quickly using CloudFormation templates and Ansible playbooks.
2. Consistency: both tools ensure that configurations are applied uniformly across all environments.
3. Efficiency: less time needed to deploy and manage resources.

A practical example

Imagine a complex infrastructure on AWS. With CloudFormation, we can define the base architecture, while Ansible manages the application and server configurations.

CloudFormation template

An example of a CloudFormation template that creates an EC2 instance might be:

Resources:
  MyEC2Instance:
    Type: "AWS::EC2::Instance"
    Properties:
      InstanceType: "t2.micro"
      ImageId: "ami-0c55b159cbfafe1f0"

Ansible playbook

After creating the instance with CloudFormation, we can use Ansible to configure it:

- hosts: all
  tasks:
    - name: Install Apache
      yum:
        name: httpd
        state: present
    - name: Start Apache
      service:
        name: httpd
        state: started

Infrastructure recovery

After human error or the loss of the infrastructure, CloudFormation templates can be reused to recreate the AWS resources in a few minutes. Ansible can then reconfigure the servers automatically, installing the required software and applications.

Conclusion

Adopting Infrastructure as Code (IaC) is a key step for organizations that want to modernize and automate the management of their IT infrastructure. With AWS as the cloud platform, Terraform for infrastructure provisioning, and Ansible for configuration automation, companies can achieve significant improvements in efficiency, consistency, and scalability.

Terraform defines the desired infrastructure declaratively, managing the entire resource lifecycle and ensuring consistency across environments. Ansible, for its part, automates configuration, reducing the risk of manual errors and speeding up deployment.

Integrating these technologies makes it possible to:

• Automate repetitive processes: reducing the time and effort needed to manage infrastructure manually.
• Ensure consistency: making sure that all environments are configured uniformly.
• Version configurations: making changes easy to trace and change management more efficient.
• Encourage collaboration: making it easier to share and reuse configurations across teams.

For organizations that want to start on this path of automation and continuous improvement, working with an experienced partner makes a difference. Miriade, an AWS Advanced Consulting Partner, has extensive experience implementing AWS and IaC solutions and supports companies in moving to an automated, highly efficient infrastructure.

Contact Miriade to start transforming your IT infrastructure with Infrastructure as Code, AWS, Terraform, and Ansible, for more agile, secure, and efficient infrastructure management.