Cloud Computing Basics

Three cloud service models

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• IaaS (Infrastructure as a Service): VMs, storage, and networking, e.g. AWS EC2
• PaaS (Platform as a Service): runtimes and middleware, e.g. Heroku
• SaaS (Software as a Service): ready-to-use applications, e.g. Gmail

Containers and Kubernetes

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Containers (e.g. Docker) package an app with its dependencies for environment consistency; Kubernetes handles orchestration, scaling, and self-healing.

docker run -d -p 80:80 nginx
kubectl get pods

Infrastructure as code

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Manage cloud resources with code using Terraform / Ansible for repeatable, auditable deployments.