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What is the practical difference?
A container’s writable filesystem is not durable application storage: when the container stops or crashes, its writable state is not saved. A Kubernetes volume can preserve data across container restarts, but whether it survives deletion of the Pod depends on the volume type.
| Question | Persistent volume (PV/PVC) | Ephemeral volume |
|---|---|---|
| Does the storage outlive a Pod? | Normally, yes. The PV is not destroyed just because one Pod ends. | Its lifecycle is associated with the Pod; the exact cleanup depends on the subtype. |
| Typical data | Application state that must survive Pod replacement or be used independently of one Pod. | Scratch files, rebuildable caches, logs, or configuration and secret inputs. |
| Does the name guarantee recovery? | No. Reclaim policy controls what happens after a claim is released, and the backend determines failure behavior. | No. Local ephemeral data has no long-term durability guarantee and can be lost if its node fails. |
Kubernetes describes these volume types and their lifecycle in its Volumes documentation and Ephemeral Volumes documentation.
Choose based on the data’s required lifetime
Use a PVC/PV for state that must outlive the Pod
A PersistentVolume is cluster storage provisioned by an administrator or dynamically through a StorageClass. A PVC is a workload’s request for that storage. Use this model for data that must remain available after an individual Pod is deleted or replaced.
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Persistent does not mean undeletable. After a claim is released, the PV’s reclaim policy determines whether its storage is deleted or retained. Dynamically provisioned volumes use Delete when the StorageClass does not specify a different policy; Retain leaves the storage asset for separate recovery or cleanup. Check the relevant StorageClass and PersistentVolume documentation.
- Make the claim lifecycle and reclaim policy intentional, rather than assuming data will remain recoverable.
- Confirm the backend’s failure domain, backup method, and recovery process. PV/PVC lifecycle alone does not establish backup or disaster-recovery protection.
- Check application consistency requirements: a volume’s persistence does not by itself make writes consistent or provide a backup.
Use an ephemeral volume for Pod-scoped data
Choose an ephemeral volume when the data is temporary, can be recreated, or is an input supplied to the Pod. The subtype determines where data comes from, how storage is provisioned, and what gets cleaned up.
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Which ephemeral volume type fits?
| Type | Best fit | Important behavior |
|---|---|---|
emptyDir |
Scratch space or a rebuildable cache shared by containers in a Pod. | Starts empty for the Pod and can use local disk or RAM. Local data can be lost if the node fails; a tmpfs-backed volume is counted as container memory, not local ephemeral storage. |
configMap, downwardAPI, or secret |
Configuration, Pod metadata, or secret input. | Use the matching projected volume for input data rather than treating it as application state. |
| CSI ephemeral | A driver-provided storage feature that must be specified inline in the Pod. | Supported by only some CSI drivers. The volume is created after scheduling, and this type does not support storage-capacity-aware scheduling. |
| Generic ephemeral | Per-Pod storage that should use PVC provisioning but be associated with the Pod’s lifecycle. | Kubernetes creates a PVC in the Pod’s namespace from a claim template in the Pod spec and makes the Pod its owner. Supported capabilities depend on the selected storage driver. |
Kubernetes also documents image volumes. CSI ephemeral volumes have been stable since Kubernetes v1.25, and generic ephemeral volumes since v1.23; these are feature-stability milestones, not performance guarantees. See the ephemeral volume types documentation.
Understand what local ephemeral storage includes
Local ephemeral storage may include non-tmpfs emptyDir data, container logs, images, and writable container layers. It is useful for temporary data, not as a substitute for durable application storage. A memory-backed emptyDir uses tmpfs and counts toward container memory instead.
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Set local ephemeral-storage requests and limits
Kubernetes can track, reserve, and limit local ephemeral storage using ephemeral-storage requests and limits. An emptyDir.sizeLimit can set a cap for that volume. Accounting and enforcement depend on kubelet measurement and supported filesystem layout; if the kubelet cannot measure relevant storage, a configured limit may not behave as expected. Verify the node configuration against the Kubernetes Local ephemeral storage guidance.
Check generic ephemeral PVC naming and access
Kubernetes constructs a generic ephemeral PVC name from the Pod name and volume name. A collision with another Pod’s naming combination or a manually created PVC can prevent the Pod from starting. Kubernetes checks ownership, but that check does not remove the conflict. Also account for the fact that users allowed to create Pods can indirectly request PVCs through generic ephemeral volumes; admission and quota policy should reflect that.
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Verify CSI driver support and settings
CSI ephemeral volumes are not universally supported. Confirm the selected CSI driver supports ephemeral lifecycle mode, review its driver-specific attributes, and ensure inline use does not expose configuration administrators intended to restrict. Because this type lacks capacity-aware scheduling, do not assume the scheduler will place a Pod based on available capacity for that volume. See Kubernetes’ CSI ephemeral volume guidance and Storage Capacity documentation.
Account for node failure with local persistent volumes
A local PV is persistent in its claim lifecycle, but its data remains tied to a node. It requires node affinity so the scheduler places the Pod on the node that has the storage; if that node is unhealthy, the volume may be inaccessible. Kubernetes recommends delayed binding with WaitForFirstConsumer for local volumes so scheduling constraints are considered when selecting the volume. Refer to the StorageClass documentation and PersistentVolume documentation.
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- Ask whether the data must survive Pod deletion. If yes, request persistent storage with a PVC/PV and decide how reclaim, backup, and recovery should work.
- If data can be discarded or rebuilt, choose an ephemeral type. For node-local scratch or cache, use
emptyDirand configure capacity controls where the node supports measurement. - For configuration or secrets, use the matching projected volume. These are Pod inputs, not durable application state.
- If you need PVC provisioning tied to a Pod, consider generic ephemeral storage. Check the StorageClass reclaim policy, driver capabilities, quotas, and possible PVC name collisions.
- If you need inline CSI functionality, verify the driver first. Confirm ephemeral-mode support and account for the absence of capacity-aware scheduling.
- Check node-failure requirements separately. A local volume can be inaccessible when its node is unhealthy; for any storage backend, confirm its own availability and recovery behavior.
What to verify in your cluster
The right choice depends on the actual StorageClasses, CSI drivers, backend failure domains, and backup implementation in your cluster. For persistent data, establish how it is backed up and recovered; for ephemeral storage, establish the node’s measurement and enforcement configuration. Kubernetes’ general lifecycle rules do not establish a particular provider’s performance, snapshot, expansion, or availability guarantees.
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