How deeply does Kubernetes for Developers cover access mode?

Defines three access modes and their storage implications, but defers provisioning behavior to StorageClass configuration.

Access mode

As explained in Kubernetes for Developers

An access mode specifies how and by how many Pods a persistent volume may be mounted for reading and writing.

An access mode specifies how a persistent volume can be mounted and how many Pods can read or write it. A PersistentVolumeClaim declares the desired mode. section 9.1.2

Choose the mode according to the storage workload:

ReadWriteOnce mounts traditional block storage for read/write access from a single Pod and is the common choice for stateful applications. section 9.1.2
ReadOnlyMany mounts existing data read-only across multiple Pods. section 9.1.2
ReadWriteMany allows multiple Pods to read and write simultaneously, typically with file storage such as NFS; only some storage drivers support it. section 9.1.2

MariaDB on a persistent disk

A MariaDB Pod mounts its claim at /var/lib/mysql. The claim requests 2 GiB with ReadWriteOnce, allowing a dynamically provisioned disk-backed PersistentVolume to bind to it.

How Kubernetes for Developers covers it

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Also explained in

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Kubernetes in Action, Second EditionAn access mode is a PersistentVolume and PersistentVolumeClaim specification describing how a volume may be mounted by nodes or pods for reading and writing.
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Acing the Certified Kubernetes Administrator Exam, Second EditionAn access mode is a storage configuration specifying how many pods may read from or write to a volume.

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Related concepts

readwriteonceincludes · ReadWriteOnce is a Kubernetes persistent-storage access mode allowing a volume to be mounted for read-write use by a single node.
readonlymanyincludes · ReadOnlyMany is a Kubernetes volume access mode allowing a volume to be mounted concurrently as read-only by multiple nodes or pods.
readwritemanyincludes · ReadWriteMany is a Kubernetes volume access mode allowing a volume to be mounted concurrently as read-write by multiple nodes or pods.
persistent volumeconfigures · A persistent volume is durable storage provisioned independently of an individual workload’s lifecycle, allowing data to survive workload replacement or restart.
emptydir volumecontrasts with · 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.
ReadWriteOncePodincludes · ReadWriteOncePod is a Kubernetes volume access mode allowing a volume to be mounted read-write by only one pod at a time.

This explainer was generated by Manning's knowledge graph from the text of Kubernetes for Developers. The section links point to the parts of the book it draws on.