What is Infrastructure as Code (IaC)?

Infrastructure as Code (IaC) means managing and provisioning infrastructure with code, usually as scripts or configuration files rather than manual setup. You define your servers, networks, and storage as text, then apply the same practices you already use for application software: version control, code review, and automated deployment.

The older way is to have a system administrator configure each component by hand. That works, but it's slow, easy to get wrong, and hard to reproduce the same way across environments. IaC takes a different path. It puts the definition of your infrastructure into files that machines can apply consistently, and that humans can review before anything changes.

Terraform has become the de facto standard for infrastructure as code, but a few others are Pulumi, AWS CloudFormation, and Azure Resource Manager.

Here is why teams adopt Infrastructure as Code:

1. Automation: By representing infrastructure configurations as code, IaC allows for automation of the provisioning and management processes. This eliminates manual and repetitive tasks, reduces human error, and ensures consistency across environments.

2. Reproducibility: IaC provides a reliable and reproducible way to create and manage infrastructure. With code-based configurations, you can easily recreate and deploy infrastructure setups in multiple environments, such as development, staging, and production, ensuring consistency throughout the application lifecycle.

3. Scalability: Infrastructure as Code enables the ability to scale infrastructure resources up or down as needed. By defining infrastructure in code, you can easily modify configurations to accommodate changes in workload or user demand, allowing for flexible and efficient resource allocation.

4. Version control: Treating infrastructure as code enables the use of version control systems like Git. This allows you to track changes, roll back to previous versions, collaborate with teams, and apply best practices for code review and documentation.

5. Collaboration: IaC facilitates collaboration among teams, such as developers, system administrators, and operations personnel. Infrastructure configurations can be shared, reviewed, and modified as necessary, enabling cross-functional teams to work together more effectively.

6. Portability: With Infrastructure as Code, infrastructure configurations can be abstracted from the underlying infrastructure provider. This abstraction allows you to switch between different cloud providers or deploy on-premises, making it easier to adopt multi-cloud or hybrid cloud strategies.

7. Auditing and compliance: By having infrastructure configurations stored as code, organizations can easily audit and track changes made to the infrastructure. This helps ensure compliance with security policies, regulatory requirements, and industry standards.

Put together, these reasons explain why so many teams now manage infrastructure the same way they manage application code. Infrastructure stops being a pile of manual steps and becomes something you can version, review, and rebuild on demand.

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