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IaC Principles in Cloud Computing

Learn about IaC Principles in this comprehensive Cloud Computing tutorial. Why code matters.

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1Disaster Recovery

With CloudFormation, disaster recovery becomes trivial. If a region goes down, you simply run your template in a new region, and an exact replica of your entire infrastructure is built in minutes.

2Step-by-Step Breakdown

The Click-Ops Problem. Clicking through the AWS Console to create VPCs, EC2s, and RDS instances is slow, error-prone, and impossible to replicate exactly.

Infrastructure as Code (IaC). Writing a declarative text file that describes exactly what your AWS infrastructure should look like.

What is CloudFormation?. AWS's native IaC service. You provide a YAML or JSON template, and CloudFormation provisions the resources in the correct order.

Stacks. The collection of AWS resources generated by your template is called a Stack. You manage, update, or delete the resources as a single unit.

Knowledge Check. What do you call the group of AWS resources that CloudFormation creates from your template?

→A Stack
→A Cluster

Template Sections. Templates have specific sections: Parameters (inputs), Resources (the actual EC2/S3 you want to build), and Outputs (returning the generated IDs).

Dependency Management. CloudFormation is smart. If an EC2 instance needs a Security Group, it will automatically build the Security Group first.

Drift Detection. If someone manually logs into the console and changes a resource (e.g., opens port 22), CloudFormation Drift Detection will flag that the reality no longer matches your code.

Rollbacks. If a template fails halfway through deployment (e.g., a typo in an RDS parameter), CloudFormation automatically rolls back and deletes the half-built resources to prevent orphaned costs.

Summary. CloudFormation makes your infrastructure repeatable, reviewable, and reliable.

Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Manually editing resources that CloudFormation manages ('ClickOps drift')

aws cloudformation detect-stack-drift --stack-name my-stack

The Solution //

Changing a stack-managed resource directly in the console causes drift — CloudFormation's tracked state no longer matches reality, and the next update can fail or silently revert your manual change. Always change stack resources through a template update, and use drift detection to catch when it's happened.

The Error //

Hardcoding account-specific values (ARNs, IDs) directly into a template

Parameters:
  Environment:
    Type: String
Resources:
  Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Sub "my-app-${Environment}"

The Solution //

A template with hardcoded account IDs or resource ARNs can't be reused across environments or accounts. Use Parameters, Mappings, or intrinsic functions like !Ref and !GetAtt so the same template deploys correctly to dev, staging, and prod.