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Sudarshan Yadav
Sudarshan Yadav

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📅 Day 18 | AWS CloudFormation — Infrastructure as Code (IaC) in AWS ☁️

📅 Day 18 | AWS CloudFormation — Infrastructure as Code (IaC) in AWS ☁️

Today, I learned about AWS CloudFormation, which is an Infrastructure as Code (IaC) service that helps create, update, and delete AWS resources automatically using YAML or JSON templates.

CloudFormation is widely used in DevOps to deploy infrastructure in a repeatable, consistent, and automated way.

🏗️ AWS CloudFormation (DevOps – Infrastructure Automation)

🔹 Amazon CloudFormation

Service Type

Infrastructure as Code (IaC)

Template Format

YAML / JSON

Key Features

  • Automated infrastructure creation
  • Manages full lifecycle (Create, Update, Delete)
  • Consistent deployments
  • Automatic rollback on failure
  • Fully managed by AWS

🔹 Why We Use CloudFormation in DevOps

CloudFormation is used when we need:

  • ✅ Automated infrastructure deployment
  • ✅ Repeatable environments (Dev / Test / Prod)
  • ✅ Version-controlled infrastructure
  • ✅ Reduced manual errors
  • ✅ Easy rollback and recovery

🔹 Real-World DevOps Use Cases

Use Case Why CloudFormation
EC2 & VPC setup One-click infrastructure
Auto Scaling Consistent scaling
CI/CD pipelines Infrastructure automation
Disaster recovery Easy recreation
Multi-environment setup Template reuse

🔹 How CloudFormation Works (Architecture)

User

↓

CloudFormation Template (YAML / JSON)

↓

CloudFormation Stack

↓

AWS Resources (EC2, S3, VPC, IAM, RDS)

🔹 Key CloudFormation Components

  • Template – Blueprint of infrastructure
  • Stack – Deployed version of template
  • Resources – AWS services defined
  • Parameters – Input values
  • Outputs – Results like IP, DNS

🔹 Step-by-Step: How to Use CloudFormation

🔹 Step 1: Create Template

Create a YAML or JSON file defining AWS resources.

Resources:
  MyS3Bucket:
    Type: AWS::S3::Bucket
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🔹 Step 2: Create Stack

  • AWS Console → CloudFormation
  • Click Create Stack
  • Upload template
  • Enter stack name
  • Click Create

🔹 Step 3: Stack Creation

CloudFormation:

  • Creates resources automatically
  • Handles dependencies
  • Shows status: CREATE_COMPLETE

🔹 Step 4: Update Stack

  • Modify template
  • Click Update Stack
  • Resources update automatically

🔹 Step 5: Delete Stack

  • Delete stack
  • All resources are deleted safely

🔹 CloudFormation vs Terraform (Interview)

Feature CloudFormation Terraform
Provider AWS only Multi-cloud
Language YAML / JSON HCL
State AWS managed Local / Remote
Owner AWS HashiCorp

🔹 CloudFormation Usage in DevOps

Tool Usage
Jenkins Infra automation
CI/CD Stack deployment
Git Template versioning
CodePipeline IaC workflow
DevOps Teams Environment setup

🔹 Common Interview Questions

Q1: What is CloudFormation?

✔ Infrastructure as Code service in AWS.

Q2: Supported template formats?

✔ YAML and JSON.

Q3: What is a Stack?

✔ Deployed template.

Q4: Does CloudFormation support rollback?

✔ Yes.

🔹 One-Line Interview Answer

AWS CloudFormation is an Infrastructure as Code service used to automate AWS resources using YAML or JSON templates.

Thank You

🔗 Connect With Me

🌐 Platform 🔗 Link
🐙 GitHub https://lnkd.in/d2F3JPa3
✍️ Dev.to Blog https://lnkd.in/dNtgqAME
💼 LinkedIn https://lnkd.in/d3NctxFT
📄 Resume (Google Drive) https://lnkd.in/dHDNsd_D

🔖 Hashtags

AWS #DevOps #CloudComputing #AWSLearning #EBS #VolumeMounting #DataPersistence #LearningJourney #CareerGrowth #DevOpsEngineer #AWSCommunity

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