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Lessons (15)

• GitOps, Progressive Delivery and Observability

  Ship safely with Argo CD and canaries, watch the cluster with Prometheus, and scale smarter with VPA, KEDA …

• Brokers, Replication & Durability

  … a partition. - Multi-region: tools like MirrorMaker 2 or Cluster Linking copy topics between clusters for disaster recovery …

• Practical Project: Deploy a Real CRM App on EKS

  … 30 bash eksctl create cluster -f cluster.yaml takes 15–20 minutes aws eks update-kubeconfig --name "$CLUSTER …

• AWS Databases: Choose the Right One

  … A Multi-AZ DB cluster is a different deployment option with readable instances. Aurora also has its own …

• Internals, Upgrades, Resilience and Interview Questions

  … Multi-cluster for blast-radius isolation or regions: Argo CD ApplicationSets, a service mesh or Cilium Cluster Mesh …

• Kafka vs RabbitMQ & the Kafka Ecosystem

  … No separate cluster needed; it runs inside your service. java // Count orders per customer in 1-minute windows …

• What Is Apache Kafka?

  … RabbitMQ) Kafka --- --- --- After a message is consumed Deleted Kept (for days, weeks, or forever) Multiple independent readers Needs …

• DynamoDB Modeling, RDS Scaling and Data Resilience

  Design DynamoDB tables around access patterns, then scale and protect relational databases with replicas, proxies and Multi-AZ …

• Extending Kubernetes: CRDs, Operators and Admission

  … Fail can block the whole cluster, including its own recovery. Exclude kube-system and the webhook's own …

• Node.js and Express

  … Share types and validation between client and server cluster / multiple processes Use all CPU cores (or run several …

• Run Containers on AWS with ECR and ECS

  … Specify an appropriate platform during build or publish a suitable multi-architecture image. Map the image into an …

• API Gateway, BFF & Service Discovery

  … networking as infrastructure As services multiply, every one needs retries, timeouts, mutual TLS, metrics and tracing. Instead of …

• Collaborative Document Editing & Real-Time Sync

  … partition = doc id, clustering = rev) ops(doc id, rev, client id, client seq, author, ts, payload BLOB) PRIMARY …

• Domain-Driven Design: Tactical Patterns

  … no identity Money(€10) , Email , Address Aggregate A cluster of objects changed together as one consistency unit, with …

• Caching & Redis

  … In a multi-service system, publish a durable product.updated event so other caches can invalidate too. 3 …