Why containers
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
explain what problem containers solve and how they differ from VMs.
Planned topics
- "Works on my machine" happens because machines differ; a container packs the app with its runtime and libraries.
- A container is an isolated process on the host's kernel; a VM runs a whole separate operating system.
- Containers start in seconds and use less memory than VMs.
- A container is not a security boundary as strong as a VM.
- Docker is the most common tool; the image format is a standard.
Draft outline details
Demonstration
two stacks side by side: VM (app, guest OS, hypervisor, hardware) versus container (app, container runtime, host OS, hardware).
Check your understanding
Does a container include its own kernel?
Show answer
No; it shares the host's kernel.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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