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Lessons (29)

• Code Profiling

  … Start with a realistic workload and a clear baseline; otherwise you may make code harder to read without …

• AWS Security Building Blocks

  … customer, API workload, and developer. Give the customer access only to its own orders, the workload access to …

• Multi-Account Strategy, Governance and Security Operations

  … billing and Organizations only; no workloads. - Log archive : immutable, centralized CloudTrail and Config logs. - Security tooling : GuardDuty, Security …

• RBAC and Cluster Security

  … false For cloud access, use workload identity (EKS IRSA or Pod Identity, GKE Workload Identity). The pod receives …

• Containers at Scale: ECS Deep Dive and EKS

  … right-size requests, use Spot via Karpenter for tolerant workloads, and use Savings Plans for the stable base …

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

  … Connection limits, memory budgets, transaction behavior and workload shape all matter. For connection-heavy workloads, a pooler such …

• Internals, Upgrades, Resilience and Interview Questions

  … How would you secure a cluster? Least-privilege RBAC, dedicated ServiceAccounts with workload identity, Pod Security restricted , default …

• IAM: Who Can Do What

  … named set of permissions that a person or workload temporarily assumes IAM Identity Center Recommended sign-in for …

• VPC Networking Without the Confusion

  … AWS reserves five addresses in a typical IPv4 subnet, so not every address is available to your workloads …

• StatefulSets, DaemonSets, Jobs and CronJobs

  Pick the right workload type: stable identity for databases, one pod per node for agents, and run-to …

• VPC Endpoints, Transit Gateway and Hybrid Networking

  … Its policy restricts the path; the workload still needs authorization. See [interface endpoint configuration](https://docs.aws.amazon …

• Serverless Architecture

  … great for spiky workloads. - Design functions to be stateless, small, idempotent and least-privileged; use queues for resilience …

• Resilience, Disaster Recovery and Multi-Region Design

  … Tighter targets cost much more, so define them per workload , not for everything. Failure scopes Scope Example failure …

• Cost Optimization and the Well-Architected Framework

  … On-demand None None Unpredictable or short-lived workloads Compute Savings Plans Up to roughly 66% 1 or …

• Big Data: ETL, Warehouses and Streaming

  … Measure freshness, missing/duplicate input and cost per workload; rapid dashboards with wrong revenue are a failure. Check …

• Deployments: Keep Your App Running

  … Later you can let an autoscaler do this from load. Which workload should I use? Use this When …

• Dependencies, Data Sources, and Resource Lifecycle

  … Which object is replaced? Would a running workload be affected? Delete the lab after you finish. Key takeaway …

• System Design Interview Framework

  … ask who uses it and which workload matters. Task: agree on durable messages, ordering scope, latency and exclusions …

• Resources, QoS and Scheduling Control

  … Combine them for dedicated nodes. - Add a PDB to every production workload with more than one replica.

• AWS Interview Questions: Clear Answers

  … A NAT route can permit outbound IPv4 access for private workloads without making them directly reachable by unsolicited …

• GitOps, Progressive Delivery and Observability

  … Use spot or preemptible nodes for fault-tolerant workloads, protected by PDBs and topology spread. - Tools such as …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  … Tune it for the workload and alarm on DLQ depth. 3. Enable partial batch response so one bad …

• Choosing an Architecture

  … Serverless Functions triggered by events, managed services Spiky workloads, event processing, zero-ops Cold starts, limits, lock-in …

• Practical Project: Deploy a Real CRM App on EKS

  … A pod role scopes access to one workload. That is least privilege in practice. 5. Create the cluster …

• Backend Design Scenarios

  … Clarify the workload and the failure you are seeing. 2. Measure the bottleneck with logs, metrics and traces …

• Domains, Load Balancers and HTTPS

  … Pick it to match the workload rather than copying a random tutorial. A beginner health endpoint Here is …

• AWS Databases: Choose the Right One

  … A read replica can handle selected read workloads, but replication lag means a new write may not be …

• L6 Production Debugging Casebook

  … logs, allocation profiling/JFR, container memory limits and workload/request counts alongside the dumps. Do not diagnose only …

• Caching & Redis

  … item not used for the longest time Most workloads ✅ LFU (Least Frequently Used) The item used the fewest …