Chapter 6. PersistentVolumeClaim [v1] Description PersistentVolumeClaim is a user's request for and claim to a persistent volume Type object 6.1. Specification Property Type Description apiVersion string APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources kind string Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds metadata ObjectMeta Standard object's metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata spec object PersistentVolumeClaimSpec describes the common attributes of storage devices and allows a Source for provider-specific attributes status object PersistentVolumeClaimStatus is the current status of a persistent volume claim. 6.1.1. .spec Description PersistentVolumeClaimSpec describes the common attributes of storage devices and allows a Source for provider-specific attributes Type object Property Type Description accessModes array (string) accessModes contains the desired access modes the volume should have. More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#access-modes-1 dataSource object TypedLocalObjectReference contains enough information to let you locate the typed referenced object inside the same namespace. dataSourceRef object dataSourceRef specifies the object from which to populate the volume with data, if a non-empty volume is desired. This may be any object from a non-empty API group (non core object) or a PersistentVolumeClaim object. When this field is specified, volume binding will only succeed if the type of the specified object matches some installed volume populator or dynamic provisioner. This field will replace the functionality of the dataSource field and as such if both fields are non-empty, they must have the same value. For backwards compatibility, when namespace isn't specified in dataSourceRef, both fields (dataSource and dataSourceRef) will be set to the same value automatically if one of them is empty and the other is non-empty. When namespace is specified in dataSourceRef, dataSource isn't set to the same value and must be empty. There are three important differences between dataSource and dataSourceRef: * While dataSource only allows two specific types of objects, dataSourceRef allows any non-core object, as well as PersistentVolumeClaim objects. * While dataSource ignores disallowed values (dropping them), dataSourceRef preserves all values, and generates an error if a disallowed value is specified. * While dataSource only allows local objects, dataSourceRef allows objects in any namespaces. (Beta) Using this field requires the AnyVolumeDataSource feature gate to be enabled. (Alpha) Using the namespace field of dataSourceRef requires the CrossNamespaceVolumeDataSource feature gate to be enabled. resources object VolumeResourceRequirements describes the storage resource requirements for a volume. selector LabelSelector selector is a label query over volumes to consider for binding. storageClassName string storageClassName is the name of the StorageClass required by the claim. More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#class-1 volumeAttributesClassName string volumeAttributesClassName may be used to set the VolumeAttributesClass used by this claim. If specified, the CSI driver will create or update the volume with the attributes defined in the corresponding VolumeAttributesClass. This has a different purpose than storageClassName, it can be changed after the claim is created. An empty string value means that no VolumeAttributesClass will be applied to the claim but it's not allowed to reset this field to empty string once it is set. If unspecified and the PersistentVolumeClaim is unbound, the default VolumeAttributesClass will be set by the persistentvolume controller if it exists. If the resource referred to by volumeAttributesClass does not exist, this PersistentVolumeClaim will be set to a Pending state, as reflected by the modifyVolumeStatus field, until such as a resource exists. More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#volumeattributesclass (Alpha) Using this field requires the VolumeAttributesClass feature gate to be enabled. volumeMode string volumeMode defines what type of volume is required by the claim. Value of Filesystem is implied when not included in claim spec. Possible enum values: - "Block" means the volume will not be formatted with a filesystem and will remain a raw block device. - "Filesystem" means the volume will be or is formatted with a filesystem. volumeName string volumeName is the binding reference to the PersistentVolume backing this claim. 6.1.2. .spec.dataSource Description TypedLocalObjectReference contains enough information to let you locate the typed referenced object inside the same namespace. Type object Required kind name Property Type Description apiGroup string APIGroup is the group for the resource being referenced. If APIGroup is not specified, the specified Kind must be in the core API group. For any other third-party types, APIGroup is required. kind string Kind is the type of resource being referenced name string Name is the name of resource being referenced 6.1.3. .spec.dataSourceRef Description dataSourceRef specifies the object from which to populate the volume with data, if a non-empty volume is desired. This may be any object from a non-empty API group (non core object) or a PersistentVolumeClaim object. When this field is specified, volume binding will only succeed if the type of the specified object matches some installed volume populator or dynamic provisioner. This field will replace the functionality of the dataSource field and as such if both fields are non-empty, they must have the same value. For backwards compatibility, when namespace isn't specified in dataSourceRef, both fields (dataSource and dataSourceRef) will be set to the same value automatically if one of them is empty and the other is non-empty. When namespace is specified in dataSourceRef, dataSource isn't set to the same value and must be empty. There are three important differences between dataSource and dataSourceRef: * While dataSource only allows two specific types of objects, dataSourceRef allows any non-core object, as well as PersistentVolumeClaim objects. * While dataSource ignores disallowed values (dropping them), dataSourceRef preserves all values, and generates an error if a disallowed value is specified. * While dataSource only allows local objects, dataSourceRef allows objects in any namespaces. (Beta) Using this field requires the AnyVolumeDataSource feature gate to be enabled. (Alpha) Using the namespace field of dataSourceRef requires the CrossNamespaceVolumeDataSource feature gate to be enabled. Type object Required kind name Property Type Description apiGroup string APIGroup is the group for the resource being referenced. If APIGroup is not specified, the specified Kind must be in the core API group. For any other third-party types, APIGroup is required. kind string Kind is the type of resource being referenced name string Name is the name of resource being referenced namespace string Namespace is the namespace of resource being referenced Note that when a namespace is specified, a gateway.networking.k8s.io/ReferenceGrant object is required in the referent namespace to allow that namespace's owner to accept the reference. See the ReferenceGrant documentation for details. (Alpha) This field requires the CrossNamespaceVolumeDataSource feature gate to be enabled. 6.1.4. .spec.resources Description VolumeResourceRequirements describes the storage resource requirements for a volume. Type object Property Type Description limits object (Quantity) Limits describes the maximum amount of compute resources allowed. More info: https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ requests object (Quantity) Requests describes the minimum amount of compute resources required. If Requests is omitted for a container, it defaults to Limits if that is explicitly specified, otherwise to an implementation-defined value. Requests cannot exceed Limits. More info: https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ 6.1.5. .status Description PersistentVolumeClaimStatus is the current status of a persistent volume claim. Type object Property Type Description accessModes array (string) accessModes contains the actual access modes the volume backing the PVC has. More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes#access-modes-1 allocatedResourceStatuses object (string) allocatedResourceStatuses stores status of resource being resized for the given PVC. Key names follow standard Kubernetes label syntax. Valid values are either: * Un-prefixed keys: - storage - the capacity of the volume. * Custom resources must use implementation-defined prefixed names such as "example.com/my-custom-resource" Apart from above values - keys that are unprefixed or have kubernetes.io prefix are considered reserved and hence may not be used. ClaimResourceStatus can be in any of following states: - ControllerResizeInProgress: State set when resize controller starts resizing the volume in control-plane. - ControllerResizeFailed: State set when resize has failed in resize controller with a terminal error. - NodeResizePending: State set when resize controller has finished resizing the volume but further resizing of volume is needed on the node. - NodeResizeInProgress: State set when kubelet starts resizing the volume. - NodeResizeFailed: State set when resizing has failed in kubelet with a terminal error. Transient errors don't set NodeResizeFailed. For example: if expanding a PVC for more capacity - this field can be one of the following states: - pvc.status.allocatedResourceStatus['storage'] = "ControllerResizeInProgress" - pvc.status.allocatedResourceStatus['storage'] = "ControllerResizeFailed" - pvc.status.allocatedResourceStatus['storage'] = "NodeResizePending" - pvc.status.allocatedResourceStatus['storage'] = "NodeResizeInProgress" - pvc.status.allocatedResourceStatus['storage'] = "NodeResizeFailed" When this field is not set, it means that no resize operation is in progress for the given PVC. A controller that receives PVC update with previously unknown resourceName or ClaimResourceStatus should ignore the update for the purpose it was designed. For example - a controller that only is responsible for resizing capacity of the volume, should ignore PVC updates that change other valid resources associated with PVC. This is an alpha field and requires enabling RecoverVolumeExpansionFailure feature. allocatedResources object (Quantity) allocatedResources tracks the resources allocated to a PVC including its capacity. Key names follow standard Kubernetes label syntax. Valid values are either: * Un-prefixed keys: - storage - the capacity of the volume. * Custom resources must use implementation-defined prefixed names such as "example.com/my-custom-resource" Apart from above values - keys that are unprefixed or have kubernetes.io prefix are considered reserved and hence may not be used. Capacity reported here may be larger than the actual capacity when a volume expansion operation is requested. For storage quota, the larger value from allocatedResources and PVC.spec.resources is used. If allocatedResources is not set, PVC.spec.resources alone is used for quota calculation. If a volume expansion capacity request is lowered, allocatedResources is only lowered if there are no expansion operations in progress and if the actual volume capacity is equal or lower than the requested capacity. A controller that receives PVC update with previously unknown resourceName should ignore the update for the purpose it was designed. For example - a controller that only is responsible for resizing capacity of the volume, should ignore PVC updates that change other valid resources associated with PVC. This is an alpha field and requires enabling RecoverVolumeExpansionFailure feature. capacity object (Quantity) capacity represents the actual resources of the underlying volume. conditions array conditions is the current Condition of persistent volume claim. If underlying persistent volume is being resized then the Condition will be set to 'ResizeStarted'. conditions[] object PersistentVolumeClaimCondition contains details about state of pvc currentVolumeAttributesClassName string currentVolumeAttributesClassName is the current name of the VolumeAttributesClass the PVC is using. When unset, there is no VolumeAttributeClass applied to this PersistentVolumeClaim This is an alpha field and requires enabling VolumeAttributesClass feature. modifyVolumeStatus object ModifyVolumeStatus represents the status object of ControllerModifyVolume operation phase string phase represents the current phase of PersistentVolumeClaim. Possible enum values: - "Bound" used for PersistentVolumeClaims that are bound - "Lost" used for PersistentVolumeClaims that lost their underlying PersistentVolume. The claim was bound to a PersistentVolume and this volume does not exist any longer and all data on it was lost. - "Pending" used for PersistentVolumeClaims that are not yet bound 6.1.6. .status.conditions Description conditions is the current Condition of persistent volume claim. If underlying persistent volume is being resized then the Condition will be set to 'ResizeStarted'. Type array 6.1.7. .status.conditions[] Description PersistentVolumeClaimCondition contains details about state of pvc Type object Required type status Property Type Description lastProbeTime Time lastProbeTime is the time we probed the condition. lastTransitionTime Time lastTransitionTime is the time the condition transitioned from one status to another. message string message is the human-readable message indicating details about last transition. reason string reason is a unique, this should be a short, machine understandable string that gives the reason for condition's last transition. If it reports "ResizeStarted" that means the underlying persistent volume is being resized. status string type string 6.1.8. .status.modifyVolumeStatus Description ModifyVolumeStatus represents the status object of ControllerModifyVolume operation Type object Required status Property Type Description status string status is the status of the ControllerModifyVolume operation. It can be in any of following states: - Pending Pending indicates that the PersistentVolumeClaim cannot be modified due to unmet requirements, such as the specified VolumeAttributesClass not existing. - InProgress InProgress indicates that the volume is being modified. - Infeasible Infeasible indicates that the request has been rejected as invalid by the CSI driver. To resolve the error, a valid VolumeAttributesClass needs to be specified. Note: New statuses can be added in the future. Consumers should check for unknown statuses and fail appropriately. Possible enum values: - "InProgress" InProgress indicates that the volume is being modified - "Infeasible" Infeasible indicates that the request has been rejected as invalid by the CSI driver. To resolve the error, a valid VolumeAttributesClass needs to be specified - "Pending" Pending indicates that the PersistentVolumeClaim cannot be modified due to unmet requirements, such as the specified VolumeAttributesClass not existing targetVolumeAttributesClassName string targetVolumeAttributesClassName is the name of the VolumeAttributesClass the PVC currently being reconciled 6.2. API endpoints The following API endpoints are available: /api/v1/persistentvolumeclaims GET : list or watch objects of kind PersistentVolumeClaim /api/v1/watch/persistentvolumeclaims GET : watch individual changes to a list of PersistentVolumeClaim. deprecated: use the 'watch' parameter with a list operation instead. /api/v1/namespaces/{namespace}/persistentvolumeclaims DELETE : delete collection of PersistentVolumeClaim GET : list or watch objects of kind PersistentVolumeClaim POST : create a PersistentVolumeClaim /api/v1/watch/namespaces/{namespace}/persistentvolumeclaims GET : watch individual changes to a list of PersistentVolumeClaim. deprecated: use the 'watch' parameter with a list operation instead. /api/v1/namespaces/{namespace}/persistentvolumeclaims/{name} DELETE : delete a PersistentVolumeClaim GET : read the specified PersistentVolumeClaim PATCH : partially update the specified PersistentVolumeClaim PUT : replace the specified PersistentVolumeClaim /api/v1/watch/namespaces/{namespace}/persistentvolumeclaims/{name} GET : watch changes to an object of kind PersistentVolumeClaim. deprecated: use the 'watch' parameter with a list operation instead, filtered to a single item with the 'fieldSelector' parameter. /api/v1/namespaces/{namespace}/persistentvolumeclaims/{name}/status GET : read status of the specified PersistentVolumeClaim PATCH : partially update status of the specified PersistentVolumeClaim PUT : replace status of the specified PersistentVolumeClaim 6.2.1. /api/v1/persistentvolumeclaims HTTP method GET Description list or watch objects of kind PersistentVolumeClaim Table 6.1. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaimList schema 401 - Unauthorized Empty 6.2.2. /api/v1/watch/persistentvolumeclaims HTTP method GET Description watch individual changes to a list of PersistentVolumeClaim. deprecated: use the 'watch' parameter with a list operation instead. Table 6.2. HTTP responses HTTP code Reponse body 200 - OK WatchEvent schema 401 - Unauthorized Empty 6.2.3. /api/v1/namespaces/{namespace}/persistentvolumeclaims HTTP method DELETE Description delete collection of PersistentVolumeClaim Table 6.3. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed Table 6.4. HTTP responses HTTP code Reponse body 200 - OK Status schema 401 - Unauthorized Empty HTTP method GET Description list or watch objects of kind PersistentVolumeClaim Table 6.5. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaimList schema 401 - Unauthorized Empty HTTP method POST Description create a PersistentVolumeClaim Table 6.6. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 6.7. Body parameters Parameter Type Description body PersistentVolumeClaim schema Table 6.8. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 201 - Created PersistentVolumeClaim schema 202 - Accepted PersistentVolumeClaim schema 401 - Unauthorized Empty 6.2.4. /api/v1/watch/namespaces/{namespace}/persistentvolumeclaims HTTP method GET Description watch individual changes to a list of PersistentVolumeClaim. deprecated: use the 'watch' parameter with a list operation instead. Table 6.9. HTTP responses HTTP code Reponse body 200 - OK WatchEvent schema 401 - Unauthorized Empty 6.2.5. /api/v1/namespaces/{namespace}/persistentvolumeclaims/{name} Table 6.10. Global path parameters Parameter Type Description name string name of the PersistentVolumeClaim HTTP method DELETE Description delete a PersistentVolumeClaim Table 6.11. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed Table 6.12. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 202 - Accepted PersistentVolumeClaim schema 401 - Unauthorized Empty HTTP method GET Description read the specified PersistentVolumeClaim Table 6.13. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 401 - Unauthorized Empty HTTP method PATCH Description partially update the specified PersistentVolumeClaim Table 6.14. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 6.15. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 201 - Created PersistentVolumeClaim schema 401 - Unauthorized Empty HTTP method PUT Description replace the specified PersistentVolumeClaim Table 6.16. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 6.17. Body parameters Parameter Type Description body PersistentVolumeClaim schema Table 6.18. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 201 - Created PersistentVolumeClaim schema 401 - Unauthorized Empty 6.2.6. /api/v1/watch/namespaces/{namespace}/persistentvolumeclaims/{name} Table 6.19. Global path parameters Parameter Type Description name string name of the PersistentVolumeClaim HTTP method GET Description watch changes to an object of kind PersistentVolumeClaim. deprecated: use the 'watch' parameter with a list operation instead, filtered to a single item with the 'fieldSelector' parameter. Table 6.20. HTTP responses HTTP code Reponse body 200 - OK WatchEvent schema 401 - Unauthorized Empty 6.2.7. /api/v1/namespaces/{namespace}/persistentvolumeclaims/{name}/status Table 6.21. Global path parameters Parameter Type Description name string name of the PersistentVolumeClaim HTTP method GET Description read status of the specified PersistentVolumeClaim Table 6.22. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 401 - Unauthorized Empty HTTP method PATCH Description partially update status of the specified PersistentVolumeClaim Table 6.23. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 6.24. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 201 - Created PersistentVolumeClaim schema 401 - Unauthorized Empty HTTP method PUT Description replace status of the specified PersistentVolumeClaim Table 6.25. Query parameters Parameter Type Description dryRun string When present, indicates that modifications should not be persisted. An invalid or unrecognized dryRun directive will result in an error response and no further processing of the request. Valid values are: - All: all dry run stages will be processed fieldValidation string fieldValidation instructs the server on how to handle objects in the request (POST/PUT/PATCH) containing unknown or duplicate fields. Valid values are: - Ignore: This will ignore any unknown fields that are silently dropped from the object, and will ignore all but the last duplicate field that the decoder encounters. This is the default behavior prior to v1.23. - Warn: This will send a warning via the standard warning response header for each unknown field that is dropped from the object, and for each duplicate field that is encountered. The request will still succeed if there are no other errors, and will only persist the last of any duplicate fields. This is the default in v1.23+ - Strict: This will fail the request with a BadRequest error if any unknown fields would be dropped from the object, or if any duplicate fields are present. The error returned from the server will contain all unknown and duplicate fields encountered. Table 6.26. Body parameters Parameter Type Description body PersistentVolumeClaim schema Table 6.27. HTTP responses HTTP code Reponse body 200 - OK PersistentVolumeClaim schema 201 - Created PersistentVolumeClaim schema 401 - Unauthorized Empty

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