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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?

To support multiple options during container startup. Signup and view all the answers

Which statement about tmpfs storage is true?

Only containers running on a Linux OS can share tmpfs space. Signup and view all the answers

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

False Signup and view all the answers

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

True Signup and view all the answers

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

False Signup and view all the answers

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

False Signup and view all the answers

Storage Plugins in Docker can connect to external storage platforms.

True Signup and view all the answers

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.