Chapter 4. FlowSchema [flowcontrol.apiserver.k8s.io/v1] Description FlowSchema defines the schema of a group of flows. Note that a flow is made up of a set of inbound API requests with similar attributes and is identified by a pair of strings: the name of the FlowSchema and a "flow distinguisher". Type object 4.1. 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 metadata is the standard object's metadata. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata spec object FlowSchemaSpec describes how the FlowSchema's specification looks like. status object FlowSchemaStatus represents the current state of a FlowSchema. 4.1.1. .spec Description FlowSchemaSpec describes how the FlowSchema's specification looks like. Type object Required priorityLevelConfiguration Property Type Description distinguisherMethod object FlowDistinguisherMethod specifies the method of a flow distinguisher. matchingPrecedence integer matchingPrecedence is used to choose among the FlowSchemas that match a given request. The chosen FlowSchema is among those with the numerically lowest (which we take to be logically highest) MatchingPrecedence. Each MatchingPrecedence value must be ranged in [1,10000]. Note that if the precedence is not specified, it will be set to 1000 as default. priorityLevelConfiguration object PriorityLevelConfigurationReference contains information that points to the "request-priority" being used. rules array rules describes which requests will match this flow schema. This FlowSchema matches a request if and only if at least one member of rules matches the request. if it is an empty slice, there will be no requests matching the FlowSchema. rules[] object PolicyRulesWithSubjects prescribes a test that applies to a request to an apiserver. The test considers the subject making the request, the verb being requested, and the resource to be acted upon. This PolicyRulesWithSubjects matches a request if and only if both (a) at least one member of subjects matches the request and (b) at least one member of resourceRules or nonResourceRules matches the request. 4.1.2. .spec.distinguisherMethod Description FlowDistinguisherMethod specifies the method of a flow distinguisher. Type object Required type Property Type Description type string type is the type of flow distinguisher method The supported types are "ByUser" and "ByNamespace". Required. 4.1.3. .spec.priorityLevelConfiguration Description PriorityLevelConfigurationReference contains information that points to the "request-priority" being used. Type object Required name Property Type Description name string name is the name of the priority level configuration being referenced Required. 4.1.4. .spec.rules Description rules describes which requests will match this flow schema. This FlowSchema matches a request if and only if at least one member of rules matches the request. if it is an empty slice, there will be no requests matching the FlowSchema. Type array 4.1.5. .spec.rules[] Description PolicyRulesWithSubjects prescribes a test that applies to a request to an apiserver. The test considers the subject making the request, the verb being requested, and the resource to be acted upon. This PolicyRulesWithSubjects matches a request if and only if both (a) at least one member of subjects matches the request and (b) at least one member of resourceRules or nonResourceRules matches the request. Type object Required subjects Property Type Description nonResourceRules array nonResourceRules is a list of NonResourcePolicyRules that identify matching requests according to their verb and the target non-resource URL. nonResourceRules[] object NonResourcePolicyRule is a predicate that matches non-resource requests according to their verb and the target non-resource URL. A NonResourcePolicyRule matches a request if and only if both (a) at least one member of verbs matches the request and (b) at least one member of nonResourceURLs matches the request. resourceRules array resourceRules is a slice of ResourcePolicyRules that identify matching requests according to their verb and the target resource. At least one of resourceRules and nonResourceRules has to be non-empty. resourceRules[] object ResourcePolicyRule is a predicate that matches some resource requests, testing the request's verb and the target resource. A ResourcePolicyRule matches a resource request if and only if: (a) at least one member of verbs matches the request, (b) at least one member of apiGroups matches the request, (c) at least one member of resources matches the request, and (d) either (d1) the request does not specify a namespace (i.e., Namespace=="" ) and clusterScope is true or (d2) the request specifies a namespace and least one member of namespaces matches the request's namespace. subjects array subjects is the list of normal user, serviceaccount, or group that this rule cares about. There must be at least one member in this slice. A slice that includes both the system:authenticated and system:unauthenticated user groups matches every request. Required. subjects[] object Subject matches the originator of a request, as identified by the request authentication system. There are three ways of matching an originator; by user, group, or service account. 4.1.6. .spec.rules[].nonResourceRules Description nonResourceRules is a list of NonResourcePolicyRules that identify matching requests according to their verb and the target non-resource URL. Type array 4.1.7. .spec.rules[].nonResourceRules[] Description NonResourcePolicyRule is a predicate that matches non-resource requests according to their verb and the target non-resource URL. A NonResourcePolicyRule matches a request if and only if both (a) at least one member of verbs matches the request and (b) at least one member of nonResourceURLs matches the request. Type object Required verbs nonResourceURLs Property Type Description nonResourceURLs array (string) nonResourceURLs is a set of url prefixes that a user should have access to and may not be empty. For example: - "/healthz" is legal - "/hea*" is illegal - "/hea" is legal but matches nothing - "/hea/ " also matches nothing - "/healthz/ " matches all per-component health checks. "*" matches all non-resource urls. if it is present, it must be the only entry. Required. verbs array (string) verbs is a list of matching verbs and may not be empty. "*" matches all verbs. If it is present, it must be the only entry. Required. 4.1.8. .spec.rules[].resourceRules Description resourceRules is a slice of ResourcePolicyRules that identify matching requests according to their verb and the target resource. At least one of resourceRules and nonResourceRules has to be non-empty. Type array 4.1.9. .spec.rules[].resourceRules[] Description ResourcePolicyRule is a predicate that matches some resource requests, testing the request's verb and the target resource. A ResourcePolicyRule matches a resource request if and only if: (a) at least one member of verbs matches the request, (b) at least one member of apiGroups matches the request, (c) at least one member of resources matches the request, and (d) either (d1) the request does not specify a namespace (i.e., Namespace=="" ) and clusterScope is true or (d2) the request specifies a namespace and least one member of namespaces matches the request's namespace. Type object Required verbs apiGroups resources Property Type Description apiGroups array (string) apiGroups is a list of matching API groups and may not be empty. "*" matches all API groups and, if present, must be the only entry. Required. clusterScope boolean clusterScope indicates whether to match requests that do not specify a namespace (which happens either because the resource is not namespaced or the request targets all namespaces). If this field is omitted or false then the namespaces field must contain a non-empty list. namespaces array (string) namespaces is a list of target namespaces that restricts matches. A request that specifies a target namespace matches only if either (a) this list contains that target namespace or (b) this list contains " ". Note that " " matches any specified namespace but does not match a request that does not specify a namespace (see the clusterScope field for that). This list may be empty, but only if clusterScope is true. resources array (string) resources is a list of matching resources (i.e., lowercase and plural) with, if desired, subresource. For example, [ "services", "nodes/status" ]. This list may not be empty. "*" matches all resources and, if present, must be the only entry. Required. verbs array (string) verbs is a list of matching verbs and may not be empty. "*" matches all verbs and, if present, must be the only entry. Required. 4.1.10. .spec.rules[].subjects Description subjects is the list of normal user, serviceaccount, or group that this rule cares about. There must be at least one member in this slice. A slice that includes both the system:authenticated and system:unauthenticated user groups matches every request. Required. Type array 4.1.11. .spec.rules[].subjects[] Description Subject matches the originator of a request, as identified by the request authentication system. There are three ways of matching an originator; by user, group, or service account. Type object Required kind Property Type Description group object GroupSubject holds detailed information for group-kind subject. kind string kind indicates which one of the other fields is non-empty. Required serviceAccount object ServiceAccountSubject holds detailed information for service-account-kind subject. user object UserSubject holds detailed information for user-kind subject. 4.1.12. .spec.rules[].subjects[].group Description GroupSubject holds detailed information for group-kind subject. Type object Required name Property Type Description name string name is the user group that matches, or "*" to match all user groups. See https://github.com/kubernetes/apiserver/blob/master/pkg/authentication/user/user.go for some well-known group names. Required. 4.1.13. .spec.rules[].subjects[].serviceAccount Description ServiceAccountSubject holds detailed information for service-account-kind subject. Type object Required namespace name Property Type Description name string name is the name of matching ServiceAccount objects, or "*" to match regardless of name. Required. namespace string namespace is the namespace of matching ServiceAccount objects. Required. 4.1.14. .spec.rules[].subjects[].user Description UserSubject holds detailed information for user-kind subject. Type object Required name Property Type Description name string name is the username that matches, or "*" to match all usernames. Required. 4.1.15. .status Description FlowSchemaStatus represents the current state of a FlowSchema. Type object Property Type Description conditions array conditions is a list of the current states of FlowSchema. conditions[] object FlowSchemaCondition describes conditions for a FlowSchema. 4.1.16. .status.conditions Description conditions is a list of the current states of FlowSchema. Type array 4.1.17. .status.conditions[] Description FlowSchemaCondition describes conditions for a FlowSchema. Type object Property Type Description lastTransitionTime Time lastTransitionTime is the 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. Required. type string type is the type of the condition. Required. 4.2. API endpoints The following API endpoints are available: /apis/flowcontrol.apiserver.k8s.io/v1/flowschemas DELETE : delete collection of FlowSchema GET : list or watch objects of kind FlowSchema POST : create a FlowSchema /apis/flowcontrol.apiserver.k8s.io/v1/watch/flowschemas GET : watch individual changes to a list of FlowSchema. deprecated: use the 'watch' parameter with a list operation instead. /apis/flowcontrol.apiserver.k8s.io/v1/flowschemas/{name} DELETE : delete a FlowSchema GET : read the specified FlowSchema PATCH : partially update the specified FlowSchema PUT : replace the specified FlowSchema /apis/flowcontrol.apiserver.k8s.io/v1/watch/flowschemas/{name} GET : watch changes to an object of kind FlowSchema. deprecated: use the 'watch' parameter with a list operation instead, filtered to a single item with the 'fieldSelector' parameter. /apis/flowcontrol.apiserver.k8s.io/v1/flowschemas/{name}/status GET : read status of the specified FlowSchema PATCH : partially update status of the specified FlowSchema PUT : replace status of the specified FlowSchema 4.2.1. /apis/flowcontrol.apiserver.k8s.io/v1/flowschemas HTTP method DELETE Description delete collection of FlowSchema Table 4.1. 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 4.2. HTTP responses HTTP code Reponse body 200 - OK Status schema 401 - Unauthorized Empty HTTP method GET Description list or watch objects of kind FlowSchema Table 4.3. HTTP responses HTTP code Reponse body 200 - OK FlowSchemaList schema 401 - Unauthorized Empty HTTP method POST Description create a FlowSchema Table 4.4. 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 4.5. Body parameters Parameter Type Description body FlowSchema schema Table 4.6. HTTP responses HTTP code Reponse body 200 - OK FlowSchema schema 201 - Created FlowSchema schema 202 - Accepted FlowSchema schema 401 - Unauthorized Empty 4.2.2. /apis/flowcontrol.apiserver.k8s.io/v1/watch/flowschemas HTTP method GET Description watch individual changes to a list of FlowSchema. deprecated: use the 'watch' parameter with a list operation instead. Table 4.7. HTTP responses HTTP code Reponse body 200 - OK WatchEvent schema 401 - Unauthorized Empty 4.2.3. /apis/flowcontrol.apiserver.k8s.io/v1/flowschemas/{name} Table 4.8. Global path parameters Parameter Type Description name string name of the FlowSchema HTTP method DELETE Description delete a FlowSchema Table 4.9. 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 4.10. HTTP responses HTTP code Reponse body 200 - OK Status schema 202 - Accepted Status schema 401 - Unauthorized Empty HTTP method GET Description read the specified FlowSchema Table 4.11. HTTP responses HTTP code Reponse body 200 - OK FlowSchema schema 401 - Unauthorized Empty HTTP method PATCH Description partially update the specified FlowSchema Table 4.12. 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 4.13. HTTP responses HTTP code Reponse body 200 - OK FlowSchema schema 201 - Created FlowSchema schema 401 - Unauthorized Empty HTTP method PUT Description replace the specified FlowSchema Table 4.14. 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 4.15. Body parameters Parameter Type Description body FlowSchema schema Table 4.16. HTTP responses HTTP code Reponse body 200 - OK FlowSchema schema 201 - Created FlowSchema schema 401 - Unauthorized Empty 4.2.4. /apis/flowcontrol.apiserver.k8s.io/v1/watch/flowschemas/{name} Table 4.17. Global path parameters Parameter Type Description name string name of the FlowSchema HTTP method GET Description watch changes to an object of kind FlowSchema. deprecated: use the 'watch' parameter with a list operation instead, filtered to a single item with the 'fieldSelector' parameter. Table 4.18. HTTP responses HTTP code Reponse body 200 - OK WatchEvent schema 401 - Unauthorized Empty 4.2.5. /apis/flowcontrol.apiserver.k8s.io/v1/flowschemas/{name}/status Table 4.19. Global path parameters Parameter Type Description name string name of the FlowSchema HTTP method GET Description read status of the specified FlowSchema Table 4.20. HTTP responses HTTP code Reponse body 200 - OK FlowSchema schema 401 - Unauthorized Empty HTTP method PATCH Description partially update status of the specified FlowSchema Table 4.21. 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 4.22. HTTP responses HTTP code Reponse body 200 - OK FlowSchema schema 201 - Created FlowSchema schema 401 - Unauthorized Empty HTTP method PUT Description replace status of the specified FlowSchema Table 4.23. 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 4.24. Body parameters Parameter Type Description body FlowSchema schema Table 4.25. HTTP responses HTTP code Reponse body 200 - OK FlowSchema schema 201 - Created FlowSchema schema 401 - Unauthorized Empty

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