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Virtualisation, Containers & Kubernetes

Technology Fundamentals

Virtualisation, Containers & Kubernetes

1 min readPublished 22 Jul 2026

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Virtual machines built the cloud; containers and Kubernetes power its modern, cloud-native era.

Virtualisation & containers

Interactive explainer

Virtualisation & Containers

VMs vs containers — and why containers power modern cloud.

11. Virtualisation22. Containers33. Images & Docker44. VM vs container

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1. Virtualisation

Many VMs on one host.

A hypervisor lets one physical server run many virtual machines, each with its own full OS. It's the foundation of the cloud — but every VM carries the weight of a whole operating system.

Check your understanding

1. A container differs from a VM because it…

2. What builds and runs container images?

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Virtualisation & ContainersCloud Computing Fundamentals CompTIA A+
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A hypervisor runs many VMs (each a full OS) on one host. Containers package an app with its dependencies and share the host kernel — far lighter, faster and portable. Docker builds and runs container images so the same image runs anywhere.

Kubernetes

Interactive explainer

Kubernetes Fundamentals

How Kubernetes orchestrates containers at scale.

11. Why Kubernetes22. Cluster: control plane + nodes33. Pods44. Declarative & self-healing

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1. Why Kubernetes

Orchestration at scale.

Running a few containers is easy; running hundreds across many machines — with healing, scaling and rollouts — is not. Kubernetes (K8s) is the orchestrator that automates all of that.

Check your understanding

1. What is the smallest deployable unit in Kubernetes?

2. Kubernetes keeps your app running by…

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Virtualisation & Containers CompTIA Network+
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Running many containers across many machines needs orchestration. Kubernetes schedules containers (in Pods) across a cluster, and continuously self-heals — restarting, rescheduling and scaling to match your declared desired state.

These skills feed DevOps and platform roles and connect to cloud operations.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

Containers and Kubernetes are central to modern cloud and DevOps. Employers check you understand them conceptually even for junior roles.

Technical questions
Explain containers vs VMs and when you'd use each.+

Containers: light, portable, cloud-native apps; VMs: strong isolation, any OS. They're complementary.

Behavioural questions
Tell me about adopting a new technology like containers.+

STAR: the driver, how you learned/piloted it, and the delivery/consistency benefit.

Real-world scenarios
“Developers say 'it works on my machine' but not in production.”+

Expected answer: Recommend containerising the app so the same image runs identically everywhere.

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Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles
Cloud EngineerDevOps EngineerPlatform Engineer
Skills you're proving
ContainersDockerKubernetes basics
Recommended certifications
CompTIA Security+
Career progression

Cloud Fundamentals → containers/DevOps → Platform/Cloud Engineer.

What employers expect

That you understand cloud concepts well enough to be productive and safe on Azure or AWS from day one.

Frequently asked questions

How is a container different from a VM?

A container shares the host OS kernel and is far lighter; a VM runs a full guest OS.

What is Docker?

A tool that builds and runs containers from immutable images, giving consistent 'build once, run anywhere' deployment.

What does Kubernetes do?

It orchestrates containers across many machines — scheduling, scaling and self-healing them automatically.

Related guides

Cloud Fundamentals: Concepts, Azure & AWSCloud Computing Fundamentals ExplainedIaaS vs PaaS vs SaaS ExplainedPublic vs Private vs Hybrid Cloud

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