Chapter 3. CustomResourceDefinition [apiextensions.k8s.io/v1]

conversion

object

CustomResourceConversion describes how to convert different versions of a CR.

group

string

group is the API group of the defined custom resource. The custom resources are served under /apis/<group>/…​. Must match the name of the CustomResourceDefinition (in the form <names.plural>.<group>).

names

object

CustomResourceDefinitionNames indicates the names to serve this CustomResourceDefinition

preserveUnknownFields

boolean

preserveUnknownFields indicates that object fields which are not specified in the OpenAPI schema should be preserved when persisting to storage. apiVersion, kind, metadata and known fields inside metadata are always preserved. This field is deprecated in favor of setting x-preserve-unknown-fields to true in spec.versions[*].schema.openAPIV3Schema. See https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/#field-pruning for details.

scope

string

scope indicates whether the defined custom resource is cluster- or namespace-scoped. Allowed values are Cluster and Namespaced.

versions

array

versions is the list of all API versions of the defined custom resource. Version names are used to compute the order in which served versions are listed in API discovery. If the version string is "kube-like", it will sort above non "kube-like" version strings, which are ordered lexicographically. "Kube-like" versions start with a "v", then are followed by a number (the major version), then optionally the string "alpha" or "beta" and another number (the minor version). These are sorted first by GA > beta > alpha (where GA is a version with no suffix such as beta or alpha), and then by comparing major version, then minor version. An example sorted list of versions: v10, v2, v1, v11beta2, v10beta3, v3beta1, v12alpha1, v11alpha2, foo1, foo10.

versions[]

object

CustomResourceDefinitionVersion describes a version for CRD.

strategy

string

strategy specifies how custom resources are converted between versions. Allowed values are: - "None": The converter only change the apiVersion and would not touch any other field in the custom resource. - "Webhook": API Server will call to an external webhook to do the conversion. Additional information is needed for this option. This requires spec.preserveUnknownFields to be false, and spec.conversion.webhook to be set.

webhook

object

WebhookConversion describes how to call a conversion webhook

clientConfig

object

WebhookClientConfig contains the information to make a TLS connection with the webhook.

conversionReviewVersions

array (string)

conversionReviewVersions is an ordered list of preferred ConversionReview versions the Webhook expects. The API server will use the first version in the list which it supports. If none of the versions specified in this list are supported by API server, conversion will fail for the custom resource. If a persisted Webhook configuration specifies allowed versions and does not include any versions known to the API Server, calls to the webhook will fail.

caBundle

string

caBundle is a PEM encoded CA bundle which will be used to validate the webhook’s server certificate. If unspecified, system trust roots on the apiserver are used.

service

object

ServiceReference holds a reference to Service.legacy.k8s.io

url

string

url gives the location of the webhook, in standard URL form (scheme://host:port/path). Exactly one of url or service must be specified.

The host should not refer to a service running in the cluster; use the service field instead. The host might be resolved via external DNS in some apiservers (e.g., kube-apiserver cannot resolve in-cluster DNS as that would be a layering violation). host may also be an IP address.

Please note that using localhost or 127.0.0.1 as a host is risky unless you take great care to run this webhook on all hosts which run an apiserver which might need to make calls to this webhook. Such installs are likely to be non-portable, i.e., not easy to turn up in a new cluster.

The scheme must be "https"; the URL must begin with "https://".

A path is optional, and if present may be any string permissible in a URL. You may use the path to pass an arbitrary string to the webhook, for example, a cluster identifier.

Attempting to use a user or basic auth e.g. "user:password@" is not allowed. Fragments ("#…​") and query parameters ("?…​") are not allowed, either.

name

string

name is the name of the service. Required

namespace

string

namespace is the namespace of the service. Required

path

string

path is an optional URL path at which the webhook will be contacted.

port

integer

port is an optional service port at which the webhook will be contacted. port should be a valid port number (1-65535, inclusive). Defaults to 443 for backward compatibility.

categories

array (string)

categories is a list of grouped resources this custom resource belongs to (e.g. 'all'). This is published in API discovery documents, and used by clients to support invocations like kubectl get all.

kind

string

kind is the serialized kind of the resource. It is normally CamelCase and singular. Custom resource instances will use this value as the kind attribute in API calls.

listKind

string

listKind is the serialized kind of the list for this resource. Defaults to "`kind`List".

plural

string

plural is the plural name of the resource to serve. The custom resources are served under /apis/<group>/<version>/…​/<plural>. Must match the name of the CustomResourceDefinition (in the form <names.plural>.<group>). Must be all lowercase.

shortNames

array (string)

shortNames are short names for the resource, exposed in API discovery documents, and used by clients to support invocations like kubectl get <shortname>. It must be all lowercase.

singular

string

singular is the singular name of the resource. It must be all lowercase. Defaults to lowercased kind.

additionalPrinterColumns

array

additionalPrinterColumns specifies additional columns returned in Table output. See https://kubernetes.io/docs/reference/using-api/api-concepts/#receiving-resources-as-tables for details. If no columns are specified, a single column displaying the age of the custom resource is used.

additionalPrinterColumns[]

object

CustomResourceColumnDefinition specifies a column for server side printing.

deprecated

boolean

deprecated indicates this version of the custom resource API is deprecated. When set to true, API requests to this version receive a warning header in the server response. Defaults to false.

deprecationWarning

string

deprecationWarning overrides the default warning returned to API clients. May only be set when deprecated is true. The default warning indicates this version is deprecated and recommends use of the newest served version of equal or greater stability, if one exists.

name

string

name is the version name, e.g. “v1”, “v2beta1”, etc. The custom resources are served under this version at /apis/<group>/<version>/…​ if served is true.

schema

object

CustomResourceValidation is a list of validation methods for CustomResources.

selectableFields

array

selectableFields specifies paths to fields that may be used as field selectors. A maximum of 8 selectable fields are allowed. See https://kubernetes.io/docs/concepts/overview/working-with-objects/field-selectors

selectableFields[]

object

SelectableField specifies the JSON path of a field that may be used with field selectors.

served

boolean

served is a flag enabling/disabling this version from being served via REST APIs

storage

boolean

storage indicates this version should be used when persisting custom resources to storage. There must be exactly one version with storage=true.

subresources

object

CustomResourceSubresources defines the status and scale subresources for CustomResources.

description

string

description is a human readable description of this column.

format

string

format is an optional OpenAPI type definition for this column. The 'name' format is applied to the primary identifier column to assist in clients identifying column is the resource name. See https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#data-types for details.

jsonPath

string

jsonPath is a simple JSON path (i.e. with array notation) which is evaluated against each custom resource to produce the value for this column.

name

string

name is a human readable name for the column.

priority

integer

priority is an integer defining the relative importance of this column compared to others. Lower numbers are considered higher priority. Columns that may be omitted in limited space scenarios should be given a priority greater than 0.

type

string

type is an OpenAPI type definition for this column. See https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#data-types for details.

openAPIV3Schema

``

openAPIV3Schema is the OpenAPI v3 schema to use for validation and pruning.

jsonPath

string

jsonPath is a simple JSON path which is evaluated against each custom resource to produce a field selector value. Only JSON paths without the array notation are allowed. Must point to a field of type string, boolean or integer. Types with enum values and strings with formats are allowed. If jsonPath refers to absent field in a resource, the jsonPath evaluates to an empty string. Must not point to metdata fields. Required.

scale

object

CustomResourceSubresourceScale defines how to serve the scale subresource for CustomResources.

status

object

CustomResourceSubresourceStatus defines how to serve the status subresource for CustomResources. Status is represented by the .status JSON path inside of a CustomResource. When set, * exposes a /status subresource for the custom resource * PUT requests to the /status subresource take a custom resource object, and ignore changes to anything except the status stanza * PUT/POST/PATCH requests to the custom resource ignore changes to the status stanza

labelSelectorPath

string

labelSelectorPath defines the JSON path inside of a custom resource that corresponds to Scale status.selector. Only JSON paths without the array notation are allowed. Must be a JSON Path under .status or .spec. Must be set to work with HorizontalPodAutoscaler. The field pointed by this JSON path must be a string field (not a complex selector struct) which contains a serialized label selector in string form. More info: https://kubernetes.io/docs/tasks/access-kubernetes-api/custom-resources/custom-resource-definitions#scale-subresource If there is no value under the given path in the custom resource, the status.selector value in the /scale subresource will default to the empty string.

specReplicasPath

string

specReplicasPath defines the JSON path inside of a custom resource that corresponds to Scale spec.replicas. Only JSON paths without the array notation are allowed. Must be a JSON Path under .spec. If there is no value under the given path in the custom resource, the /scale subresource will return an error on GET.

statusReplicasPath

string

statusReplicasPath defines the JSON path inside of a custom resource that corresponds to Scale status.replicas. Only JSON paths without the array notation are allowed. Must be a JSON Path under .status. If there is no value under the given path in the custom resource, the status.replicas value in the /scale subresource will default to 0.

acceptedNames

object

CustomResourceDefinitionNames indicates the names to serve this CustomResourceDefinition

conditions

array

conditions indicate state for particular aspects of a CustomResourceDefinition

conditions[]

object

CustomResourceDefinitionCondition contains details for the current condition of this pod.

storedVersions

array (string)

storedVersions lists all versions of CustomResources that were ever persisted. Tracking these versions allows a migration path for stored versions in etcd. The field is mutable so a migration controller can finish a migration to another version (ensuring no old objects are left in storage), and then remove the rest of the versions from this list. Versions may not be removed from spec.versions while they exist in this list.

categories

array (string)

categories is a list of grouped resources this custom resource belongs to (e.g. 'all'). This is published in API discovery documents, and used by clients to support invocations like kubectl get all.

kind

string

kind is the serialized kind of the resource. It is normally CamelCase and singular. Custom resource instances will use this value as the kind attribute in API calls.

listKind

string

listKind is the serialized kind of the list for this resource. Defaults to "`kind`List".

plural

string

plural is the plural name of the resource to serve. The custom resources are served under /apis/<group>/<version>/…​/<plural>. Must match the name of the CustomResourceDefinition (in the form <names.plural>.<group>). Must be all lowercase.

shortNames

array (string)

shortNames are short names for the resource, exposed in API discovery documents, and used by clients to support invocations like kubectl get <shortname>. It must be all lowercase.

singular

string

singular is the singular name of the resource. It must be all lowercase. Defaults to lowercased kind.

lastTransitionTime

Time

lastTransitionTime last time the condition transitioned from one status to another.

message

string

message is a human-readable message indicating details about last transition.

reason

string

reason is a unique, one-word, CamelCase reason for the condition’s last transition.

status

string

status is the status of the condition. Can be True, False, Unknown.

type

string

type is the type of the condition. Types include Established, NamesAccepted and Terminating.

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

200 - OK

Status schema

401 - Unauthorized

Empty

200 - OK

CustomResourceDefinitionList schema

401 - Unauthorized

Empty

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.

body

CustomResourceDefinition schema

200 - OK

CustomResourceDefinition schema

201 - Created

CustomResourceDefinition schema

202 - Accepted

CustomResourceDefinition schema

401 - Unauthorized

Empty

200 - OK

WatchEvent schema

401 - Unauthorized

Empty

name

string

name of the CustomResourceDefinition

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

200 - OK

Status schema

202 - Accepted

Status schema

401 - Unauthorized

Empty

200 - OK

CustomResourceDefinition schema

401 - Unauthorized

Empty

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.

200 - OK

CustomResourceDefinition schema

201 - Created

CustomResourceDefinition schema

401 - Unauthorized

Empty

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.

body

CustomResourceDefinition schema

200 - OK

CustomResourceDefinition schema

201 - Created

CustomResourceDefinition schema

401 - Unauthorized

Empty

name

string

name of the CustomResourceDefinition

200 - OK

WatchEvent schema

401 - Unauthorized

Empty

name

string

name of the CustomResourceDefinition

200 - OK

CustomResourceDefinition schema

401 - Unauthorized

Empty

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.

200 - OK

CustomResourceDefinition schema

201 - Created

CustomResourceDefinition schema

401 - Unauthorized

Empty

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.

body

CustomResourceDefinition schema

200 - OK

CustomResourceDefinition schema

201 - Created

CustomResourceDefinition schema

401 - Unauthorized

Empty