Persistent volume

As explained in Google Anthos in Action

A persistent volume is a Kubernetes resource representing storage provisioned for use by workloads independently of a pod's lifecycle.

A persistent volume represents durable storage for a Kubernetes workload independently of a Pod’s lifecycle. During VM-to-container migration, it provides a destination for application data that cannot simply become part of the container image. Migrate for Anthos (M4A) refactors VM storage into a Kubernetes-supported persistent volume while leaving networking, logging, and other shared functions to Kubernetes. section 15.3.2 section 15.4.3

Figure 15.2 Anthos Migrate: From virtual machines to containers

The VM-to-container diagram places persistent storage among the deployment artifacts rather than the VM components retained in the container image. section 15.3.2

The generated deployment YAML depends on the migration intent:

• ImageAndData describes a stateful application with a StatefulSet of Pods, a PersistentVolume for durable storage, and a PersistentVolumeClaim requesting storage characteristics such as size and access mode. section 15.4.3
• Data includes PersistentVolume and PersistentVolumeClaim resources without the image-deployment components listed for ImageAndData. section 15.4.3

M4A mounts a persistent volume through its Container Storage Interface (CSI) driver and streams data from the source VM filesystem. Review the generated storage configuration before deployment: M4A does not automatically migrate NFS mounts. For an NFS share, manually define the persistent-volume directives and add them to the generated Pod YAML. section 15.3.2 section 15.5

How Google Anthos in Action covers it

How deep it goes

Explains generated volume and claim responsibilities and the migration mount path, but does not detail Kubernetes storage provisioning.

Examples

Uses ImageAndData and Data deployment intents, plus an NFS share requiring manual YAML changes.

What it assumes

Assumes familiarity with VM filesystems, Pods, and Kubernetes YAML; does not teach storage provisioning from scratch.

What you can do after

Operate/configure it by reviewing M4A-generated storage resources and adding persistent-volume directives for NFS mounts.

How it connects

Connects persistent volumes to PersistentVolumeClaims, StatefulSets, Pods, and the Container Storage Interface.

liveBookmanning.com

Read Google Anthos in Action on liveBook Get the book at manning.com

Also explained in

• 

  liveBookmanning.com
  Kubernetes in Action, Second EditionA PersistentVolume is a Kubernetes API resource representing storage provisioned for use by workloads independently of a pod's lifetime.
• 

  liveBookmanning.com
  Acing the Certified Kubernetes Administrator Exam, Second EditionA persistent volume is a Kubernetes API object representing storage provisioned for durable workload data.
• 

  liveBookmanning.com
  Kubernetes for DevelopersA persistent volume is a Kubernetes storage resource that provides data storage intended to survive container or Pod replacement.
• 

  liveBookmanning.com
  Distributed Machine Learning PatternsA PersistentVolume is a Kubernetes storage resource representing durable storage that can be provisioned and mounted independently of an individual workload.
• 

  liveBookmanning.com
  Road to KubernetesA persistent volume is a Kubernetes storage resource that provides durable storage independently of an individual container's lifecycle.
• 

  liveBookmanning.com
  Data Pipelines with Apache Airflow, Second EditionA PersistentVolume is Kubernetes storage provisioned for use by workloads independently of a pod's lifecycle.

Compare how 7 books explain persistent volume →

Related concepts

• persistent volume claimused by · A PersistentVolumeClaim is a Kubernetes resource through which a workload requests persistent storage with specified capacity, access modes, and other storage characteristics.
• poduses · A Kubernetes Pod is the smallest deployable unit in Kubernetes, grouping one or more co-located containers that share networking and other resources.
• StorageClassconfigured by · A StorageClass is a Kubernetes API resource that defines a category of storage and the provisioner and parameters for dynamically creating volumes.
• 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.
• static provisioningproduced by · Static provisioning is the administrator-managed creation of persistent storage resources before workloads request or claim them.

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