Lesson 226
Virtualization & Containers
VMs · Hypervisors · Containers · Kubernetes
1:00How hypervisors carve one machine into many VMs, how containers share the host kernel for lightweight isolation, and how Kubernetes orchestrates them at scale.
By the end, you can
- Explain the three main benefits of virtualization: isolation, utilization, and portability.
- Describe how a hypervisor works and distinguish Type-1 from Type-2 hypervisors with examples.
- Explain how hardware-assisted virtualization (VT-x/AMD-V, ring −1, trap-and-emulate) speeds up VMs.
- Compare VMs and containers structurally — what each carries, what each shares.
- Explain how Linux namespaces and cgroups together isolate and resource-limit containers.
- Trace the layers of a container image from Dockerfile to runtime writable layer and describe copy-on-write.
- State the trade-offs between VMs and containers and explain why clouds run containers inside VMs.
- Describe what Kubernetes does: pod scheduling, autoscaling, and self-healing.
- Refute the common misconception that a container is a lightweight VM.
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