Volumes (Kubernetes)

Kubernetes Volumes allows to store data independent of Container restarts. Volumes in Kubernetes are different that Docker Volumes.

Kubernetes supports different type of volumes :

• Cloud providers: awsElasticBlockStore, azureDisk, azureFile
• Storage technologies: fc (fibre channel), iscsi
• Networked filesystems: cephfs, nfs, glusterfs
• Others:
  • Cinder, configMap, CSI, downwardAPI
  • emptyDir: the data in the emptyDir is deleted forever when Pod is removed from a node.
  • FlexVolume (deprecated), can be expanded
  • flocker, gcePersistentDisk, hostPath, local, persistentVolumeClaim, projected, portworxVolume, quobyte, rbd, scaleIO, secret, storageos, vsphereVolume
  • Support for raw block storage in CSI (v1.18, March 2020)
• Deprecated: gitRepo

Persistent volumes subsystem provides an API for users and administrators that abstracts details of how storage is provided from how it is consumed.

Related terms

• CKA v1.23: Understand volume mode, access modes and reclaim policies for volumes
• CKA v1.18: Understand persistent volumes and know how to create them
• CKA v1.18: Understand access modes for volumes
• CKA v1.15: Understand PersistentVolumeClaims for storage
• kind: PersistentVolume
• Persistent Volumes (Kubernetes)
• kubectl describe pvc mysql-pv-claim
• kind: ConfigMap

Activities

• Read https://kubernetes.io/docs/concepts/storage/persistent-volumes/

See also

• Persistent Volumes
• CKA: v1.15, v1.18, 1.20, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, v1.27, v1.28: API, Namespace, Pods, secrets, Services, deployments, nodes, Volumes, Ingress, CKS
• Kubernetes storage, storage classes, PersistentVolume (PV), PVC, CSI, kind: StorageClass, kind: PersistentVolumeClaim, kind: PersistentVolume, kubectl [ get | describe | edit ] pvc, volumeClaimTemplates:, kubectl patch pv, FailedMount, Volume Expansion, Volume Cloning, snapshots, ExtraVolumes, NotTriggerScaleUp, volumePVCDataSource, AllowVolumeExpansion, EKS storage, provisioner, Storage Capacity Tracking, VolumeBinding, VolumeClaimTemplate, storage.k8s.io, CKA Storage, DoKC

https://kubernetes.io/docs/concepts/storage/volumes/

https://kubernetes.io/docs/concepts/storage/volumes/#types-of-volumes

https://kubernetes.io/docs/concepts/storage/#fc

https://kubernetes.io/docs/concepts/storage/volumes/#flexVolume

https://kubernetes.io/docs/concepts/storage/persistent-volumes/#expanding-persistent-volumes-claims