How deeply does Kubernetes in Action, Second Edition cover tmpfs?

Defines tmpfs and demonstrates its emptyDir configuration, while stopping short of filesystem implementation internals.

Tmpfs

As explained in Kubernetes in Action, Second Edition

tmpfs is a memory-backed filesystem whose stored contents reside in volatile memory.

tmpfs is a virtual filesystem that keeps files in volatile memory instead of on a hard disk. In Kubernetes, an emptyDir volume uses tmpfs when its medium is set to Memory. This can provide faster I/O and avoid writing sensitive data to disk, but the contents disappear when the pod is deleted. section 9.2.1

Configure an in-memory emptyDir volume

Set the volume medium to Memory: volumes: - name: content emptyDir: medium: Memory Mount this volume into a container as usual. Set sizeLimit as well, especially when the pod has memory resource limits, because the volume consumes memory. section 9.2.1

How Kubernetes in Action, Second Edition covers it

Cover of Kubernetes in Action, Second Edition

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Related concepts

mount pointused by · A mount point is a filesystem path where a storage device, volume, or filesystem is attached and made accessible within a directory hierarchy.
file systemkind of · A file system is a software-managed structure and interface for organizing, naming, storing, and accessing files and directories on storage.
systemdused by · systemd is a Linux system and service manager that initializes the operating system and starts, supervises, and stops services and processes.
Podmanused by · Podman is a daemonless, open-source container engine for building, running, and managing containers and container images.
emptydir volumeconfigures · An emptyDir volume is a Kubernetes volume that starts empty, is available to containers in a Pod, and is deleted when the Pod leaves its node.

This explainer was generated by Manning's knowledge graph from the text of Kubernetes in Action, Second Edition. The section links point to the parts of the book it draws on.