What is Infrastructure as Code (IaC) in SaaS?

Infrastructure as Code (IaC) is the practice of provisioning and managing IT infrastructure using code to ensure that the server, network, and all other resources are provisioned and configured automatically. For SaaS vendors, it is used for quick deployments, scaling, and system availability; the AWS Well-Architected Framework also advises defining infrastructure as code.

Here is an example of IaC (Infrastructure as Code):

Imagine being able to code something in Terraform that will describe the new cloud environment, including the amount and type of servers required, networks, and even the software that should be installed on the servers.

As you execute this code, Terraform will provision your infrastructure in the cloud based on how you have described it.

Think of it like this: DevOps is a big idea, and IaC (Infrastructure as Code) is one of the ways to make it happen. DevOps is a culture and a set of practices that aims to integrate development, operations, and other functions in the software development cycle. IaC enables the attainment of DevOps objectives through the automation of infrastructure.

AWS provides various services that can be used to manage infrastructure as code.

• AWS CloudFormation: The primary resource for creating and deploying AWS resources with the help of templates.
• AWS CDK: Defines cloud infrastructure in languages such as Python and deploys it through CloudFormation (AWS).
• AWS OpsWorks: Retired; customers can no longer use its console, API, CLI, or CloudFormation resources as of May 26, 2024 (Puppet, 2024).
• AWS Elastic Beanstalk: Employed mainly in deploying and installing web-based applications and services.

CloudFormation is a service natively tied to templates and is commonly used for managing Infrastructure as Code (IaC) on AWS.

IaC differs from infrastructure as a service (IaaS), the cloud model that rents out the servers and networks IaC provisions.

• Speed and Agility: Adapt promptly to the fast-paced SaaS environment by making infrastructure changes quickly.
• Consistency and Reliability: The configuration should be consistent across different environments and minimize human error; IaC evolved to solve environment drift (Microsoft Learn).
• Scalability: Resources can be adjusted based on demand.
• Collaboration: Ensure developers and operations teams share a common language to work together on infrastructure.
• Cost Savings: Utilize resources efficiently and don’t spend money on unnecessary infrastructure.

• Learning Curve: Use of IaC may require employee training or acquisition of employees with higher skills in the process.
• Complexity: It can be challenging to manage large and complex infrastructure deployments.
• Security: Vulnerabilities in Infrastructure as Code (IaC) influence infrastructure security.
• Tool Selection: Choosing the right IaC tools and understanding how to integrate them into existing workflows is not easy.

IaC is an approach to provisioning and managing computing network resources by using configuration languages rather than configuring hardware by hand or through graphical user interfaces.

Ideally, the configuration files are declarative, stating what an environment requires, not necessarily how (Microsoft Learn).

This approach defines and replicates infrastructure so that it can be automated and managed. It also addresses issues of variability in resource demand without involving as much action from management.