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AWS cheat sheet & developer notes

AWS cheat sheet and 3 curated developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · AWS

Interview Questions

AWS Interview Questions. Q: What is the difference between horizontal and vertical scaling?. Vertical scaling (scale up) — add more resources to the same instance (bigger EC2 instance). Has limits and usually requires do…

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02 · AWS

S3, Lambda & IAM Patterns

S3, Lambda & IAM Patterns. S3 — Key Operations (AWS CLI). # Create / manage buckets aws s3 mb s3://my-bucket aws s3 rb s3://my-bucket --force # Copy / sync aws s3 cp ./dist s3://my-bucket/dist/ --recursive aws s3 cp s3:/…

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03 · AWS

Core Services

Core AWS Services. Compute. EC2 — virtual machines; choose instance type (t3.micro, c6i.large, etc.), AMI, VPC, security groups. ECS / EKS — container orchestration; ECS is AWS-native, EKS is managed Kubernetes. Lambda —…

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Concepts to know for AWS

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DNS Resolution: From Name to IP AddressHow a resolver walks root, TLD and authoritative servers to turn a name into an address, why TTL caching explains "propagation", and where DNS breaks.Intermediate·13 minLoad Balancing: L4 vs L7, Algorithms, Health ChecksWhat L4 and L7 balancers actually forward, why least-request beats round robin, how health checks and draining make deploys safe, and why gRPC breaks it.Intermediate·13 minMessage Queues and At-Least-Once DeliveryWhy a broker can promise at-least-once but never exactly-once, queue versus log, and how idempotent consumers and the outbox make delivery effectively once.Intermediate·14 minSecrets Management: Store, Rotate, Never LeakWhere API keys and passwords really leak, why env vars deliver secrets but do not protect them, and how secret managers and short-lived credentials fix it.Intermediate·14 minBlue-Green and Canary DeploymentsBlue-green switches all traffic at once, canary shifts it in steps judged by metrics. How each rolls back, and why schema changes must expand, then contract.Intermediate·13 minGraceful Shutdown and Health ChecksWhat really happens between SIGTERM and SIGKILL, why pods get traffic after they start stopping, and what liveness, readiness and startup probes should check.Intermediate·13 min

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