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Lessons (40)

• Environments, Workspaces, and Multiple Accounts

  … A naming suffix alone does not isolate access. text infra/ modules/private-storage/ environments/ dev/ main.tf backend …

• Variables, Locals, Outputs, and Validation

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

• Production Capstone and Interview Practice

  Combine modules, isolated environments, remote state, tests, and reviewed delivery in a production-style storage project. Build a …

• Configuration, Secrets and Storage

  … Do not build separate images containing “development database” or “production database.” Put environment-specific settings outside the image …

• Safe AWS Deployments with IaC and CI/CD

  … Restrict the role to the repository, branch/environment, and exact deployment permissions. Deployment safety - Build an immutable artifact …

• CI/CD and Reviewed Production Changes

  … Applying it does not prompt for approval, so the CI environment approval is the actual gate. Store the …

• Testing, Preconditions, and Policy Checks

  … Plan review What operations will happen in this environment? Policy checks Are these operations allowed by organizational rules …

• Deploying & Operating Microservices

  … environment. - Tag images with the git SHA or a version, never just latest . - Store configuration in the environment …

• Python Fundamentals

  … one virtual environment per project A virtual environment is a private folder of packages for one project, so …

• Providers and Your First AWS Resources

  … This example intentionally leaves force destroy disabled. Practice: change only the Environment tag and inspect the plan. It …

• Docker & Containers

  … ports: ["3000:3000"] environment: DATABASE URL: postgres://app:secret@db:5432/shop REDIS URL: redis://cache:6379 depends …

• Multi-Account Strategy, Governance and Security Operations

  … per team, per environment (dev, staging, prod). AWS Organizations and SCPs Service Control Policies constrain principals in member …

• Resilience, Disaster Recovery and Multi-Region Design

  … Restore backups into a clean environment and time it against your RTO. 4. Document runbooks and keep them …

• GitOps, Progressive Delivery and Observability

  … true Use Kustomize overlays (base plus per-environment patches) or Helm values per environment. Keep application code and …

• Cost Optimization and the Well-Architected Framework

  … unused EC2, unattached EBS volumes, old snapshots, idle load balancers, dev environments running overnight. 2. NAT gateway data …

• Serverless: Lambda and API Gateway

  … Do not use the module dictionary as a production database; execution environments can disappear or be replicated. Test …

• Storage Engines & Database Operations

  … Keep independent backups, define retention, encrypt them, and test restoring a realistic dataset into an isolated environment. Know …

• Count, for_each, Functions, and Stable Identities

  … Terraform", Team = "platform" } tags = merge(local.common tags, { Environment = "dev" }) subnet cidr = cidrsubnet("10.42.0.0/16 …

• HCL, Resource Addresses, and Project Layout

  … Refer to a local as local.project , an input as var.environment , and a resource attribute as aws …

• Releases, Observability and Production Safety

  … instances gradually Blue-green Switch between two complete environments Canary Expose a small cohort before expansion Feature flag …

• Design a Logging and Monitoring Platform

  … data lifecycle Collect structured events with timestamp, service, environment, severity, request/trace ID and tenant-safe labels. The …

• Your Practical Kubernetes Workflow

  … a chart and lets you change values per environment. ![Helm: a chart plus values renders into Kubernetes manifests …

• Terraform: Start Here

  … 2. Intermediate, lessons 6–10: dependencies, stable resource identities, modules, shared state, and environments. 3. Advanced, lessons 11 …

• State, Remote Backends, and Locking

  … Use partial configuration and terraform init -backend-config=dev.backend.hcl to supply environment-specific, nonsecret settings if …

• Machine Learning Fundamentals

  … in a text sequence Reinforcement Actions, rewards, and environment feedback Learn a policy for a simulated robot Classification …

• AWS: Start Here

  … identify your environment You need an AWS account with permitted access. For organizational sign-in, an administrator first …

• Secrets, Ephemeral Values, and Least Privilege

  … Scope the trust policy to the intended repository, branch or protected environment, and token audience. Give the assumed …

• Practical Project: Deploy a Real CRM App on EKS

  … The finished environment This is what the DemoCRM development environment looked like at the end of the project …

• Multi-Region and Disaster Recovery

  … test Fail the primary path in a safe environment, promote/recover, then create an order, read it, send …

• Drift, Troubleshooting, and Disaster Recovery

  … Stop writers and confirm the backend and environment. 2. Preserve the current state snapshot and logs in restricted …

• RBAC and Cluster Security

  … Preferring mounted files over environment variables, since env vars leak into logs and crash dumps more easily. Supply …

• Kubernetes Cluster Architecture, Simply

  … get pods -A Use namespaces for teams or environments such as dev , staging , and production . Remember this - A …

• AI Specialties and Real-World Examples

  … and reward → action policy Control a simulated robot Environments, rewards, exploration, policy evaluation Generative systems Prompt or context …

• API Gateway, BFF & Service Discovery

  … how services find each other In a dynamic environment, service instances come and go (autoscaling, deploys, crashes), and …

• VPC Endpoints, Transit Gateway and Hybrid Networking

  … network paths Use the actual task's network environment. Successful access from a developer laptop does not prove …

• Creational Patterns: How to Make Objects

  … creates Use when: the exact type is decided at runtime (config, user input, environment). --- 2. Abstract Factory 🛋 …

• Event-Driven Patterns, Step Functions and Reliable Lambdas

  … caps a function's concurrency Provisioned concurrency Keeps environments warm to avoid cold starts SnapStart (Java and some …

• Run Containers on AWS with ECR and ECS

  … image into an ECS service In a learning environment, configure: Setting Lab value or requirement --- --- Launch type/capacity …

• IAM: Who Can Do What

  … It does not administer IAM, delete customer uploads, or read another environment's secrets. List each API action …

• VPC Networking Without the Confusion

  … Resolve the database endpoint from the app environment. 2. Confirm both route tables retain the VPC local route …