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Lessons (40)

• Configuration, Secrets and Storage

  … ordinary settings A ConfigMap holds settings that are not secret. yaml apiVersion: v1 kind: ConfigMap metadata: name: shop …

• Environments, Workspaces, and Multiple Accounts

  Separate development and production ownership, understand workspace limits, and configure provider aliases. Isolation has several layers Development and …

• Creational Patterns: How to Make Objects

  … 0 }; url(url) { this. config.url = url; return this; } method(method) { this. config.method = method; return this; } header …

• Reusable Modules and Clear Interfaces

  … Default provider configurations can be inherited; aliased configurations require explicit wiring and appropriate configuration aliases declarations in the …

• Providers and Your First AWS Resources

  … Inspect the actual plan if provider behavior or configuration changes. Verify and clean up Using the output as …

• Imports, Moved Blocks, and Safe Refactoring

  … In an AWS-configured root, write matching resource configuration and an import block: hcl resource "aws s3 bucket …

• Terraform: Start Here

  … Terraform's configuration, state, and plan play similar roles. Terraform talks to services through providers . AWS, Azure, Google …

• State, Remote Backends, and Locking

  … It initializes before ordinary configuration evaluation. Use partial configuration and terraform init -backend-config=dev.backend.hcl to …

• Drift, Troubleshooting, and Disaster Recovery

  … Fix the permission or configuration issue, run a fresh plan, review it, then apply. Some failures can leave …

• Testing, Preconditions, and Policy Checks

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

• Multi-Account Strategy, Governance and Security Operations

  Organize accounts with Organizations and Control Tower, enforce guardrails with SCPs, and detect threats with CloudTrail, Config and …

• Run Containers on AWS with ECR and ECS

  … Create a task definition with CPU, memory, log configuration, and a task role. 3. Create an ECS service …

• Node.js and Express

  … routing, the middleware pipeline, validation, async error handling, project structure, configuration, security, rate limiting, logging and graceful shutdown …

• NestJS Core Concepts

  … async (config: ConfigService) = createClient({ url: config.get("REDIS URL") }).connect(), inject: [ConfigService], // async factory: Nest waits before starting …

• Practical Lab: S3 File Upload and CloudFront Delivery with NestJS

  … string; constructor(config: ConfigService) { this.bucket = config.getOrThrow('S3 BUCKET'); this.cdnUrl = config.getOrThrow('CLOUDFRONT URL'); // No credentials …

• AWS: Start Here

  … Install AWS CLI v2, then configure a named profile: bash aws configure sso --profile academy aws sso login …

• Secrets, Ephemeral Values, and Least Privilege

  … In a supporting configuration: hcl variable "session token" { type = string sensitive = true ephemeral = true } This value must be …

• HCL, Resource Addresses, and Project Layout

  … Further reading: [Configuration syntax](https://developer.hashicorp.com/terraform/language/syntax/configuration), [dependency lock file](https://developer.hashicorp …

• Your First Terraform Project

  … Keep this lab separate from later AWS configurations. Further reading: [CLI workflow](https://developer.hashicorp.com/terraform/cli …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  … AWS reference: [SQS event-source configuration](https://docs.aws.amazon.com/lambda/latest/dg/services-sqs-configure.html …

• Production Capstone and Interview Practice

  … Keep the module's provider requirement; configure region and credentials in each root. Replace bucket prefix with var …

• Practical Project: Deploy a Real CRM App on EKS

  … Prerequisites Install and configure these tools on your machine: Tool Check Used for --- --- --- AWS CLI v2 aws --version …

• CloudWatch: Know What Your App Is Doing

  … In ECS, configure a log driver such as awslogs ; writing stdout alone does not configure CloudWatch delivery. On …

• Serverless: Lambda and API Gateway

  … For failed asynchronous work, configure a dead-letter queue or failure destination so messages are not silently lost …

• EC2, Storage and Auto Scaling

  … Termination may delete the root volume depending on configuration. Inspect snapshots, retained volumes, and IP resources when cleaning …

• Go Web Services with Gin

  … config → db → repo → service → handler → router └── internal/ ├── config/config.go env vars, validated at startup ├── task/ │ ├── model.go …

• DRY: Don't Repeat Yourself

  … types from OpenAPI / GraphQL schema Config values copied between files One .env / config module The same SQL in …

• Kubernetes Cluster Architecture, Simply

  … it stores the requested configuration and status. Scheduler Chooses a worker node for a new pod. Controllers Watch …

• Resilience, Disaster Recovery and Multi-Region Design

  … For global tables, choose the intended consistency mode rather than assuming all configurations share the same conflict behavior …

• AWS Security Building Blocks

  … Parameter Store suits simpler configuration and can also hold secure strings. Neither means you should print secrets in …

• Dependencies, Data Sources, and Resource Lifecycle

  … Keep identity based on configuration, not an ID generated during apply. Replacement deserves attention A -/+ plan indicates destruction …

• Distributed Coordination: Consensus, Heartbeats and Gossip

  … l6/coordination.svg) Problem Tool Guarantee --- --- --- One ordered configuration/log Raft or Paxos-style consensus Majority agreement Is …

• Your Practical Kubernetes Workflow

  … desired configuration] G -- A[Argo CD or Flux] A -- K[Kubernetes cluster] This gives your team a review …

• API Gateway, BFF & Service Discovery

  … to the new version yaml Simplified gateway routing config (Kong / NGINX / Envoy style) routes: - path: /api/users service …

• CI/CD and Reviewed Production Changes

  … trusted plan job This shell sequence assumes a configured backend, trusted source checkout, and short-lived credentials supplied …

• YAGNI: You Aren't Gonna Need It

  … the configurable everything Task: export a list of orders as CSV. js // ❌ YAGNI violation: nobody asked for PDF …

• CloudFront: Faster Websites and Safer File Delivery

  … Then configure CloudFront: 1. Choose the bucket's regular S3 origin, rather than its website endpoint. 2. Create …

• GitOps, Progressive Delivery and Observability

  … Keep application code and deployment config in separate repos or folders so a config change does not require …

• Python Web APIs: FastAPI and Django

  … serializer.save(owner=self.request.user) config/urls.py from rest framework.routers import DefaultRouter router = DefaultRouter() router …

• State Management (Redux, Zustand, TanStack Query)

  … Redux, with far less boilerplate: js import { createSlice, configureStore } from "@reduxjs/toolkit"; const cartSlice = createSlice({ name: "cart", initialState …