Docker Containers and Storage Overview

What occurs to changes in a container's state that are not stored in persistent storage when the container is removed?

Which of the following statements is true regarding tmpfs storage in containers?

What is a primary characteristic of Docker containers regarding isolation?

What does the mount flag do when creating a tmpfs volume?

What role do storage plugins play in Docker?

Containers

Containers are runnable instances of images.
Docker API or CLI manages creation, starting, stopping, moving, and deleting containers.
Containers can connect to multiple networks, attach storage, or create new images.
By default, containers are isolated from other containers and the host machine.
Users can adjust container isolation levels for network, storage, and other subsystems.
A container's definition stems from its image and configuration options.
Removed container changes (non-persistent) are lost.

Storage

Temporary Filesystems (tmpfs)

tmpfs is a non-permanent storage option.
Data is written directly to host memory and deleted when the container stops.
Useful for sensitive data needing no permanent storage.
Containers can't share tmpfs space unless on a Linux OS.
tmpfs and mount flags are used during creation.
mount is newer, supporting various startup options.
Temporary filesystems are stored in RAM (or swap) and not on the host or container.

Storage Plugins

Storage plugins connect to external storage platforms.
Plugins map host storage to external sources (arrays, appliances).
A list of storage plugins is available on the Docker Plugins page.

This quiz covers essential concepts related to Docker containers and storage mechanisms, including temporary filesystems like tmpfs. Understand how containers function, their isolation levels, and the management of ephemeral data. Test your knowledge on creating and handling Docker containers efficiently.