Docker Containers and Storage
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Questions and Answers

What happens to the data in a tmpfs storage option when the container is stopped?

  • The data is written to the container's filesystem layer.
  • The data is saved permanently on the host.
  • The data is deleted. (correct)
  • The data is transferred to persistent storage.

    • Which of the following best describes the primary purpose of Storage Plugins in Docker?

  • To facilitate automatic backups of container data.
  • To allow connections to external storage platforms. (correct)
  • To manage network connectivity between containers.
  • To increase container performance by adding RAM.

    • How is the container isolated from its host machine by default?

  • By requiring user authentication to access the container.
  • By restricting network access only to root.
  • By using a shared filesystem layer.
  • By default, containers have a well-defined level of isolation. (correct)

    • What is the function of the mount flag when creating a tmpfs volume?

    <p>To support multiple options during container startup. (A)</p> Signup and view all the answers

    Which statement about tmpfs storage is true?

    <p>Only containers running on a Linux OS can share tmpfs space. (D)</p> Signup and view all the answers

    A container in Docker can persist state changes even after it is deleted.

    <p>False (B)</p> Signup and view all the answers

    Tmpfs storage uses the host's memory and clears data when the container is stopped.

    <p>True (A)</p> Signup and view all the answers

    Containers can share tmpfs space regardless of the operating system they are running on.

    <p>False (B)</p> Signup and view all the answers

    The mount flag for tmpfs is older and has limited options compared to the tmpfs flag.

    <p>False (B)</p> Signup and view all the answers

    Storage Plugins in Docker can connect to external storage platforms.

    <p>True (A)</p> Signup and view all the answers

    Flashcards

    Docker Container

    A runnable instance of a Docker image. Containers can be created, started, stopped, moved, or deleted using the Docker API or CLI.

    Tmpfs

    A type of storage for containers that uses the host's memory and is deleted when the container stops. Useful for sensitive data.

    Storage Plugins

    A storage option that allows Docker to connect to external storage platforms, like storage arrays or appliances.

    Bind Mount

    A technique where a container accesses files directly from the host's file system. Changes made within the container are reflected in the host.

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    Docker Volume

    A storage solution that allows containers to share data persistently. Changes made within the container are saved, even after the container is stopped.

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    What is tmpfs?

    A temporary storage option for Docker containers where data is written to the host's memory and deleted when the container stops. Ideal for storing sensitive data that doesn't need persistence.

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    What are Storage Plugins?

    A storage option that allows Docker to connect to external storage platforms, like storage arrays or appliances. It provides a bridge for containers to interact with persistent data sources.

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    How does a Bind Mount work in Docker?

    A method of sharing data between a container and its host machine by directly accessing the host's filesystem. Changes made within the container are reflected in the host's file system.

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    What is a Docker Volume?

    A type of storage in Docker that allows data to be shared persistently between containers. Changes made within a container are saved and accessible even after the container is stopped.

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    What is a Docker Container?

    A runnable instance of a Docker image. Containers are used to execute applications in an isolated environment and can be created, started, stopped, moved, or deleted.,

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    Study Notes

    Containers

    • Containers are runnable instances of images.
    • Created, started, stopped, moved, or deleted using Docker API or CLI.
    • Can connect to networks, attach storage, or create new images.
    • Isolated from other containers & host machine by default.
    • Isolation level adjustable for network, storage, and other subsystems.
    • Defined by image and configuration options.
    • Removed changes not in persistent storage are lost.
    • Can be connected to one or more networks.

    Storage

    Tmpfs

    • Not permanent storage like Docker volume or bind mount.
    • Data written directly to host memory; deleted on container stop.
    • Useful for sensitive data.
    • Containers cannot share tmpfs unless on Linux.
    • Created using tmpfs and optional mount flags.
    • Mount flags support multiple options during container startup.
    • Data in RAM or swap.

    Storage Plugins

    • Connect to external storage platforms.
    • Map host storage to external sources (arrays, appliances).
    • External storage plugins are viewable on Docker's Plugin page.

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    Description

    Explore the fundamentals of Docker containers and storage options. This quiz covers container creation, management, and the various storage types available in Docker, including tmpfs and storage plugins. Test your understanding of how Docker isolates containers and connects them to networks and storage.

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