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

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: API, Namespace, Pods, secrets, Services, deployments, nodes, Volumes, Ingress, CKS
• Kubernetes: CKA, CKS, Kubernetes interfaces: CSI, CNI, installation, workloads, networking, kubeadm, Kubernetes API, Kubernetes API Server, kubectl, kubeadm, kubelet, kube-proxy, Cloud services: EKS, GKE, TKE, DKS, Helm, Kubernetes RBAC, Kubernetes deployments, Minikube, Rancher, OpenShift, Charmed Kubernetes, Ingress, Kubernetes scheduler, logging, Kubernetes operator, Orka, kind:, Kubernetes namespaces, Kubernetes dashboard, Kubernetes Metrics Server, Field Selectors, CoreDNS, CRI, Kubernetes Topology Manager, Kubernetes governance: (SIG, KEP), Tekton, Knative, Kustomize, controllers, ReadinessProbe, LivenessProbe, KOPS, K9s, Kui, k3s, ImagePullBackOff, PDB, EndPoints, Kots, metadata, Karpenter, restartPolicy, Replicated.com, Kubernetes Authenticating, Kubernetes timeline, Changelog/Versions, service accounts, Kubernetes Pod Lifecycle, Kubernetes Conformance Certified, Kubernetes backup, Kubernetes Pod Security Admission, tEKS, Kubernetes events, Kubernetes ports, Kubernetes policies, Connect, addons

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