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Docker for Beginners: Run an App Without Fighting the Host
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Docker for Beginners: Run an App Without Fighting the Host

Check Yourself: Before You Run Anything

Five scenario questions on images, containers, virtual machines and the install checks. If you miss more than one, reread the first two lessons.

5 min DockerTesting and DebuggingDeployment and Containers Beginner
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1. A teammate says the app runs on her laptop but crashes on yours. She wants to ship it with everything it needs, so it starts the same way on both. Which Docker idea fits this job?
Run the app inside a registry so both laptops share it. Create a volume and put the source code on it. Build an image that holds the app and its dependencies, then run containers from it. Copy her laptop's whole Windows installation onto yours.
2. Which statement about an image and a container is correct?
A container is the package, and an image is the running process. An image and a container are two names for the same thing. An image is a read-only package, and a container is a running copy made from it. A container must be rebuilt every time you stop it.
3. Someone describes a container as "a small virtual machine with its own operating system and kernel". What is the best correction?
A container has no isolation and sees every file on the host. A container is a virtual machine that only boots faster because it has no disk. A container has its own kernel, but it is smaller than a virtual machine's kernel. A container is a process on the host, isolated by Linux features, and it shares the host's kernel.
4. You run Docker Desktop on Windows with the WSL 2 backend. Where do your Linux containers actually run?
Inside a lightweight Linux environment that Windows manages for Docker. On Docker Hub's servers, over the internet. Directly on the Windows kernel, like any Windows program. In the BIOS, before Windows starts.
5. You are installing Docker Desktop and the installer asks which backend to use. This course uses Linux containers. What should you leave selected?
Neither, because Docker Desktop can run without a backend. Use WSL 2 instead of Hyper-V. Windows containers, because the course uses Windows software. Hyper-V, because it is always required for Linux containers.

About

Five scenario questions on images, containers, virtual machines and the install checks. If you miss more than one, reread the first two lessons.

Duration
5 min
Last update
08/03/2026
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