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Explains that PVCs work if there's dynamic provisioning or pre-existing volumes.

pull/45373/head
Jacob Keller 2024-02-27 12:11:30 -08:00
parent 65b7657fd8
commit e86710dbb5
2 changed files with 11 additions and 9 deletions
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4
content/en/docs/concepts/storage/dynamic-provisioning.md
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@ -17,7 +17,8 @@ calls to their cloud or storage provider to create new storage volumes, and
then create [`PersistentVolume` objects](/docs/concepts/storage/persistent-volumes/) then create [`PersistentVolume` objects](/docs/concepts/storage/persistent-volumes/)
to represent them in Kubernetes. The dynamic provisioning feature eliminates to represent them in Kubernetes. The dynamic provisioning feature eliminates
the need for cluster administrators to pre-provision storage. Instead, it the need for cluster administrators to pre-provision storage. Instead, it
automatically provisions storage when it is requested by users. automatically provisions storage when users create
[`PersistentVolumeClaim` objects](/docs/concepts/storage/persistent-volumes/).
<!-- body --> <!-- body -->
@ -131,4 +132,3 @@ Zones in a Region. Single-Zone storage backends should be provisioned in the Zon
Pods are scheduled. This can be accomplished by setting the Pods are scheduled. This can be accomplished by setting the
[Volume Binding Mode](/docs/concepts/storage/storage-classes/#volume-binding-mode). [Volume Binding Mode](/docs/concepts/storage/storage-classes/#volume-binding-mode).

16
content/en/docs/concepts/workloads/controllers/statefulset.md
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@ -44,7 +44,7 @@ that provides a set of stateless replicas.
## Limitations ## Limitations
* The storage for a given Pod must either be provisioned by a * The storage for a given Pod must either be provisioned by a
[PersistentVolume Provisioner](https://github.com/kubernetes/examples/tree/master/staging/persistent-volume-provisioning/README.md) [PersistentVolume Provisioner](/docs/concepts/storage/dynamic-provisioning/) ([examples here](https://github.com/kubernetes/examples/tree/master/staging/persistent-volume-provisioning/README.md))
based on the requested `storage class`, or pre-provisioned by an admin. based on the requested `storage class`, or pre-provisioned by an admin.
* Deleting and/or scaling a StatefulSet down will *not* delete the volumes associated with the * Deleting and/or scaling a StatefulSet down will *not* delete the volumes associated with the
StatefulSet. This is done to ensure data safety, which is generally more valuable than an StatefulSet. This is done to ensure data safety, which is generally more valuable than an
@ -141,10 +141,13 @@ validation error during StatefulSet creation.
### Volume Claim Templates ### Volume Claim Templates
You can set the `.spec.volumeClaimTemplates` which can provide stable storage using You can set the `.spec.volumeClaimTemplates` field to create a
[PersistentVolumes](/docs/concepts/storage/persistent-volumes/) provisioned by a PersistentVolume [PersistentVolumeClaim](/docs/concepts/storage/persistent-volumes/).
Provisioner. This will provide stable storage to the StatefulSet if either
* The specified `storage class` is set up to use [dynamic
provisioning](/docs/concepts/storage/dynamic-provisioning/), or
* The cluster already contains a PersistentVolume with the correct `storage class`
and sufficient available storage space.
### Minimum ready seconds ### Minimum ready seconds
@ -488,5 +491,4 @@ the `.spec.replicas` field automatically.
Read the {{< api-reference page="workload-resources/stateful-set-v1" >}} Read the {{< api-reference page="workload-resources/stateful-set-v1" >}}
object definition to understand the API for stateful sets. object definition to understand the API for stateful sets.
* Read about [PodDisruptionBudget](/docs/concepts/workloads/pods/disruptions/) and how * Read about [PodDisruptionBudget](/docs/concepts/workloads/pods/disruptions/) and how
you can use it to manage application availability during disruptions. you can use it to manage application availability during disruptions.