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Lessons (28)

• EC2, Storage and Auto Scaling

  … Then let the Auto Scaling group create matching instances in multiple AZs. One virtual server, explained through the …

• Health Checks and Scaling

  … CPU usage. yaml apiVersion: autoscaling/v2 kind: HorizontalPodAutoscaler metadata: name: shop-api spec: scaleTargetRef: apiVersion: apps/v1 kind …

• DynamoDB Modeling, RDS Scaling and Data Resilience

  … demand capacity for unpredictable traffic and provisioned with auto scaling for steady traffic. Useful features Feature Use --- --- TTL …

• GitOps, Progressive Delivery and Observability

  … queue length, Kafka lag, cron, with scale to zero Cluster Autoscaler / Karpenter Node count; Karpenter picks the cheapest …

• Architecture Patterns at Scale

  … Extract a service only when independent scaling, releases or ownership justify its network and operational costs. 3. Use …

• Database Internals, Replication and Scaling

  … More replicas do not increase the single-writer write budget automatically. Check your understanding Which read endpoints need …

• Containers at Scale: ECS Deep Dive and EKS

  … scaler requests ten replicas. Some remain Pending. Increasing the desired replica count does not create compute automatically: inspect …

• Serverless Architecture

  … you write functions, the cloud runs them when an event happens , scales them automatically (even to zero), and …

• Choosing an Architecture

  … rules Hexagonal / Clean / Onion Independent team autonomy Modular monolith → microservices Elastic scaling of hotspots Microservices or serverless for …

• Scaling, Load Balancing & Rate Limiting

  … At 2,000 customers you can either: - Give the barista a faster espresso machine → vertical scaling (scale up …

• Monolith vs Microservices

  … once Each service independently ✅ Scale The whole app Only the busy services ✅ Team autonomy Teams step on each …

• Resilience, Disaster Recovery and Multi-Region Design

  … Example failure Defence --- --- --- Instance / task Crash, bad deploy Auto Scaling, health checks, rollback Availability Zone Power or network …

• Backend Design Scenarios

  … Make the application tier stateless and scale it horizontally with autoscaling based on requests, latency and queue depth …

• Deployments: Keep Your App Running

  … Watch the rollout status before calling a release successful. Scale by hand bash kubectl scale deployment/shop-api …

• AWS Databases: Choose the Right One

  … Allow its port only from the app security group. Feature Why it matters --- --- Automated backups Recover to an …

• 10,000 Users Do Not Need 10,000 Database Connections

  A practical mental model for connection pools, database pressure, query latency and safe scaling in Node.js applications …

• Caching, Consistent Hashing and Sharding

  … understanding Why does adding ten cache nodes not automatically solve one hot key? --- Concepts and implementation details Three …

• Vertical Slice Architecture & the Modular Monolith

  … 4. Modules communicate through public APIs or in-process events. 5. Enforce boundaries automatically , or they will erode …

• L6 Production Debugging Casebook

  … See [database scaling](./database-internals-and-scaling). Reusable incident worksheet For any production symptom, record: 1. Impact: which …

• 500 Users Upload Documents at Once: Design the Background Job Pipeline

  … The worker itself: python @celery.task( bind=True, acks late=True, acknowledge AFTER success autoretry for=(TransientError,), retry …

• What to Learn in AI, and in What Order

  … automatically a better system. What you can postpone You do not need to train a frontier-scale model …

• Consumers & Consumer Groups

  … analytics"] C3[consumer 1] end P0 & P1 -- C1 P2 & P3 -- C2 P0 & P1 & P2 & P3 -.- C3 Scaling a …

• Capacity Planning, SLOs and Error Budgets

  Turn vague scale requirements into traffic, latency, availability and cost decisions that a team can operate. The problem …

• Internals, Upgrades, Resilience and Interview Questions

  … The cost is extra complexity and resource use, so adopt it when you need those features at scale …

• Docker & Containers

  … When you have dozens of containers across many machines and need auto-restarts, scaling and zero-downtime deploys …

• Practical Project: Deploy a Real CRM App on EKS

  … Kubernetes pods on EKS Self-healing, rolling updates, scaling Persistent data RDS PostgreSQL Pods are disposable; data must …

• VPC Endpoints, Transit Gateway and Hybrid Networking

  … routing is not automatic isolation Imagine production, staging, and shared-services VPCs. Document which pairs should communicate before …

• AWS Interview Questions: Clear Answers

  … If the app needs more copies, I verify autoscaling limits and database capacity rather than scaling blindly. I …