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: v1.33: API, Namespace, Pods, secrets, Services, deployments, nodes, Volumes, Ingress, CKS, Services & Networking
• 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, emptyDir, Volume populators, storageclass.kubernetes.io, Rook, Longhorn, projected volumes

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