AWS

DevOps Engineer Path

Jenkins interview questions and answers and Answers - Part 01

Q1 Explain the master-slave architecture in Jenkins? Basic Ans: This architecture is commonly used to distribute the workload and to scale …

ALB & NLB Interview Questions & Answers

🟢 Basic Q1 What is an Application Load Balancer (ALB)? Basic An Application Load Balancer (ALB) is an AWS managed load balancing service …

Terraform Interview Questions & Answers (2026) Part 02

🟣 Terraform × ☁️ AWS — Scenario-Based Interview Guide 45+ scenario-based questions · Real-world answers · Production patterns · HCL code …

Terraform Interview Questions & Answers (2026) Part 01

Q1 What is Terraform and how does it work? Basic Ans: Terraform is an open-source Infrastructure as Code (IaC) tool by HashiCorp that lets …

AWS Interview Questions & Answers

Q1 What is cloud computing? Explain IaaS, PaaS, and SaaS. Basic Ans: Cloud computing delivers computing resources (servers, storage, …

AWS Cloud Foundations — Fresher Learning Path

How to Use This Path Each section below shows an AWS architecture diagram. Click any coloured block to see:

AWS Cloud Engineer Learning Path

Who Is This Path For? This path is designed for complete beginners who want to break into cloud computing as an AWS engineer. If you know …

Generic boto3 Pagination Utility — Handle All Paginated AWS APIs

Problem Statement You write ec2.describe_instances() and it works in dev with 5 instances. In production with 1,200 instances, it silently …

Design a Backup Strategy for a 10TB RDS PostgreSQL With 4-Hour RPO and 2-Hour RTO

The Problem A backup strategy that you haven’t tested is not a backup strategy — it’s a hope. Before designing the solution, be …

AWS Security Interview Questions and Answers

🛡️ AWS WAF — Complete Interview & Implementation Guide for AWS Cloud and DevOps Engineer Q1 What is AWS WAF Advanced Ans: AWS WAF (Web …

Application Latency Spiked After Migrating EC2 to ECS Fargate

The Problem Latency regressions after migrating to Fargate are almost always caused by networking changes — not application code. Fargate …

Single AZ Failure Took Down Black Friday — Root Cause & Fix

The Problem Your application went down because critical resources were effectively pinned to a single Availability Zone. Even though AWS …

Production RDS Ran Out of Storage at 3 AM — Incident Response and RCA

The Problem RDS storage full is a P0 incident. Unlike CPU spikes that throttle gracefully, a full disk makes the database refuse all writes …

Migrate from ECS Fargate to EKS With Zero Downtime

The Problem A big-bang cutover from ECS to EKS is too risky — if EKS has issues, you’ve already disconnected ECS. The Strangler Fig …

Implement AWS Control Tower for a 20-Account Organization

The Problem Without Control Tower, each new AWS account is a blank canvas. Security baselines drift. CloudTrail might be enabled in one …

Handling Terraform State Drift in Production

The Problem Drift is when your live AWS infrastructure no longer matches what Terraform’s state file describes. It happens when: …

EC2 Instance Communicating with Malicious IP — Incident Response

The Problem A running EC2 instance may be compromised — malware installed, data being exfiltrated, or the instance being used as a pivot to …

Terraform Plan Takes 45 Minutes — How to Fix It at Scale

The Problem Terraform’s plan command calls AWS APIs to refresh the current state of every resource — if you have 500 resources, …

Migrate a Java Monolith From On-Premises to AWS With Minimal Downtime

The Problem A 6-month deadline forces choices. You don’t have time to re-architect the monolith into microservices. You need to move …

Lambda Function Timing Out Processing Kinesis Stream Records

The Problem Lambda + Kinesis timeouts are particularly dangerous because Kinesis retries failed batches indefinitely by default. A single …

EKS Pods Getting OOMKilled in Production — Diagnose and Fix

The Problem OOMKilled (exit code 137) means the Linux kernel’s Out-Of-Memory killer terminated your container because it exceeded its …

DynamoDB Hot Partition During a Flash Sale — Diagnose and Fix

The Problem DynamoDB partitions data based on the partition key. If all requests go to items with the same partition key value (like …

Developer Pushed AWS Credentials to Public GitHub — Incident Response

The Problem Leaked AWS credentials are one of the most dangerous security incidents. Attackers have automated scrapers that monitor GitHub …

Design an Observability Stack for 50+ Microservices on EKS

The Problem Without centralized observability, you’re flying blind. Debugging requires SSH-ing into pods, grepping logs, and guessing …

Design an IAM Strategy for a 500-Engineer Organization With SOC2 & PCI-DSS Compliance

The Problem Shared admin credentials violate the most fundamental security principle: least privilege. With shared credentials, you …

Design a PCI-DSS Compliant VPC for a Multi-Tier Application

The Problem PCI-DSS requires that systems in the Cardholder Data Environment (CDE) be isolated from all other systems. …

Design a Multi-Region AWS Architecture for 99.99% Uptime

The Problem Your e-commerce application runs entirely in us-east-1. A single region failure would take the site down for hours — …

Build a Zero-Downtime Deployment Pipeline for Microservices on EKS

The Problem A traditional kubectl apply replaces all pods simultaneously — if the new image is broken, users hit errors until you notice and …

AWS Bill Jumped 40% Last Month — Investigate and Reduce Costs

The Problem A 40% cost spike rarely comes from one source. It’s usually a combination of: a forgotten service that kept running, an …

Auto Stop/Start EC2 Instances Using Schedule Tags with Python

Problem Statement Your team has 20 dev/staging EC2 instances that run 24/7 but are only used during business hours (8 AM – 8 PM). Each …

EC2 Interview Questions Part 02

Q1 What is Amazon EC2 and what are its main use cases? Basic Ans: Amazon EC2 (Elastic Compute Cloud) is a cloud service provided by Amazon …

EC2 Interview Questions Part 01

Q1 What is Amazon EC2 and what are its main use cases? Basic Ans: Amazon EC2 (Elastic Compute Cloud) is a cloud service provided by Amazon …