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Lessons (40)

• CI/CD and Reviewed Production Changes

  Design an automated plan and apply workflow with protected credentials, saved plans, serialization, and drift checks. A useful …

• Indexes, EXPLAIN & Query Plans

  Design indexes from real filter, join and sort patterns, then prove improvements with query plans and production-like …

• Your First Terraform Project

  … Applying a saved plan executes that approved plan without a second interactive confirmation. Treat plan files as sensitive …

• Drift, Troubleshooting, and Disaster Recovery

  … A later ordinary plan may still propose undoing the console change. Replacement and targeting Use terraform plan -replace …

• Imports, Moved Blocks, and Safe Refactoring

  … Verify that the plan reports a move. Compare with the proposed plan when no moved block is present …

• Testing, Preconditions, and Policy Checks

  … Create tests/service.tftest.hcl : hcl run "api filename contract" { command = plan assert { condition = endswith(output.api config …

• Premiere-Night Video Streaming

  Let millions press Play together by separating small control-plane APIs from CDN-delivered video bytes. The problem …

• Production Capstone and Interview Practice

  … test meaningful requirements In the dev root's tests/storage.tftest.hcl , add a plan assertion on a …

• Terraform: Start Here

  Understand infrastructure as code, the plan/apply workflow, and the learning path from local experiments to team operations …

• Secrets, Ephemeral Values, and Least Privilege

  … Separate plan and apply identities where practical. A plan often requires read access, but some providers or data …

• Developer Learning Plan and Document-Assistant Capstone

  Follow a practical study plan with deliverables, build a local retrieval baseline, and grow it into an evaluated …

• Capacity Planning, SLOs and Error Budgets

  … A capacity plan is a hypothesis to load-test, not a magic calculation. Latency has a budget too …

• Dependencies, Data Sources, and Resource Lifecycle

  … Broad module-level dependencies can cause more unknown values and more conservative plans. Read versus own hcl data …

• Kubernetes Cluster Architecture, Simply

  … the control plane and worker nodes](/img/kubernetes/architecture.svg) Part Simple job --- --- Control plane Receives requests, remembers …

• Variables, Locals, Outputs, and Validation

  … An output publishes a result. Supply values Create dev.tfvars : hcl project = "shop" environment = "dev" bash terraform plan …

• Providers and Your First AWS Resources

  … Run plan again and expect no changes. Plan destruction and review it before applying. An empty bucket can …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … Mediator ✈️ Analogy: Planes don't talk to each other to decide who lands first. They all talk to …

• Containers at Scale: ECS Deep Dive and EKS

  … control plane, then node groups, then add-ons. Plan for the support window of each version. - Manage add …

• Replication, Partitioning & Sharding

  Scale reads with replicas, split data safely with partitions and shards, and plan for consistency, hot keys and …

• Database Internals, Replication and Scaling

  Connect storage-engine choices, durability, replicas, query plans, pooling and data layout to real production behaviour. The problem …

• Internals, Upgrades, Resilience and Interview Questions

  Know what happens inside the control plane, how to upgrade and back up safely, and answer common senior …

• HCL, Resource Addresses, and Project Layout

  … Review the lock-file diff and resulting plan together. The lock file does not lock remote module versions …

• State, Remote Backends, and Locking

  … The post-migration plan should not unexpectedly recreate infrastructure. -reconfigure reinitializes configuration without migrating existing state; it is …

• Resilience, Disaster Recovery and Multi-Region Design

  … a system that keeps working without calling the control plane at failure time. Pre-provision capacity rather than …

• Cost Optimization and the Well-Architected Framework

  … Savings Plans save money but reduce agility. Worked cost review: cost per accepted order A monthly bill alone …

• Safe AWS Deployments with IaC and CI/CD

  … Treat the preview ( terraform plan or CloudFormation change set) as something to review, not an automatic approval. CI …

• Debug Latency Like an Investigator

  … Check database lock waits, query plans and connection counts. Correlate the release with changed query shape or concurrency …

• Count, for_each, Functions, and Stable Identities

  … Add worker = { port = 9000 } ; plan should add one file without changing the other identities. Why list indexes can …

• Reusable Modules and Clear Interfaces

  … Upgrading a module can change resource addresses and replacement behavior, so review the upgrade plan and migration guidance …

• Releases, Observability and Production Safety

  Ship changes safely with rollout strategy, flags, migration discipline, rollback plans and observable service-level outcomes. The problem …

• Kubernetes: Start Here

  … the cluster, its servers, and the control plane.

• What Is Artificial Intelligence? A Developer's Guide

  … associated with intelligence, such as recognizing patterns, reasoning, planning, understanding language, or choosing actions. AI includes both learned …

• D — Dependency Inversion Principle

  … the lamp and the power plant both depend on the socket standard](/img/solid/dip-socket.svg) 📘 DIP …

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

  … Query plans, indexes, bounded transactions and sensible timeouts usually produce a safer improvement than blindly adding concurrency. A …

• VPC Endpoints, Transit Gateway and Hybrid Networking

  … Peering and Transit Gateway connect networks and require broader route planning. Exercise and cleanup Draw the private path …

• Design System Operations

  … make themes and accessibility changes safer. - Documentation, visual checks and migration plans are part of the component contract.

• Distributed Coordination: Consensus, Heartbeats and Gossip

  … Use it for a small control plane, not as a free replacement for high-throughput data paths. Heartbeats …

• System Design Interview Framework

  … has stopped being acceptable. A 45-minute example plan Minutes Do Example question ---: --- --- 0–5 Clarify product and …

• AWS: Start Here

  … If the session expires, sign in again rather than creating permanent access keys as a shortcut. Plan cost …

• SOLID at a Glance

  … Lamps depend on the socket, not the power plant. How they connect mermaid flowchart TB S["S — one …