7. ☁️ AWS Cloud Fundamentals for DevOps Engineers (From Basics to Production)
Open to Work | Cloud & DevOps Engineer | AWS | Kubernetes | Terraform | CI/CD | Automations | Available for Full-Time / Freelance / Mentorship
🎯 Why AWS Knowledge is Mandatory for DevOps
In real-world DevOps roles:
Kubernetes runs on cloud
CI/CD deploys to cloud
Monitoring & security live in cloud
AWS provides scalable, secure, pay-as-you-go infrastructure.
🔹 AWS Global Infrastructure
AWS is built on:
Regions (Geographical)
Availability Zones (AZs) (Data centers)
Edge Locations (CDN)
🔹 Core AWS Services for DevOps
| Category | Services |
| Compute | EC2, Auto Scaling, Load Balancer |
| Storage | S3, EBS |
| Database | RDS |
| Networking | VPC, ALB, NLB |
| Security | IAM |
| Monitoring | CloudWatch |
🔹 Amazon EC2 (Compute)
EC2 provides virtual servers.
Key Concepts:
Instance types
AMIs
Security Groups
Key pairs
🔹 EC2 Scaling
Vertical scaling → Resize instance
Horizontal scaling → Auto Scaling Groups
🔹 Amazon S3 (Object Storage)
Used for:
Backups
Static websites
Logs
Artifacts
S3 Properties:
Highly durable (99.999999999%)
Object-based
Global service
🔹 S3 Storage Classes
| Class | Use |
| Standard | Frequent access |
| IA | Infrequent |
| Glacier | Archival |
🔹 AWS VPC (Networking)
VPC is a virtual network.
Includes:
Subnets
Route tables
Internet Gateway
NAT Gateway
🔹 Public vs Private Subnet
| Public | Private |
| Internet Gateway route | No IGW route |
| Public IP | Private IP |
🔹 Internet Gateway vs NAT Gateway
| IGW | NAT |
| Inbound + Outbound | Outbound only |
| Public subnets | Private subnets |
🔹 AWS Load Balancers
| Type | Layer |
| ALB | Layer 7 |
| NLB | Layer 4 |
| CLB | Legacy |
🔹 Security Groups vs NACL
| Security Group | NACL |
| Stateful | Stateless |
| Instance-level | Subnet-level |
🔹 IAM (Security Backbone)
IAM controls:
Users
Roles
Policies
👉 Always follow Least Privilege.
🔹 IAM Role vs User
User → Human access
Role → Service-to-service access
🔹 AWS CloudWatch
Used for:
Logs
Metrics
Alarms
Dashboards
🔹 CloudFront & CDN
CloudFront:
Caches content at edge locations
Reduces latency
Improves performance
🔹 AWS Pricing Model
Pay-as-you-go
Reserved Instances
Savings Plans
🔹 Real Production Scenario
Issue: Website latency high for global users
Fix: Enabled CloudFront
Result: Reduced latency & cost
🎯 Interview Takeaways
AWS is region-based
VPC networking is foundational
Security Groups are stateful
ALB vs NLB depends on layer
IAM roles preferred over users