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kube-scheduler Policy Configuration (v1)

Resource Types

Policy

Policy describes a struct for a policy resource used in api.

FieldDescription
apiVersion
string		kubescheduler.config.k8s.io/v1
kind
string		Policy
predicates [Required]
[]PredicatePolicy		Holds the information to configure the fit predicate functions
priorities [Required]
[]PriorityPolicy		Holds the information to configure the priority functions
extenders [Required]
[]LegacyExtender		Holds the information to communicate with the extender(s)
hardPodAffinitySymmetricWeight [Required]
int32		RequiredDuringScheduling affinity is not symmetric, but there is an implicit PreferredDuringScheduling affinity rule corresponding to every RequiredDuringScheduling affinity rule. HardPodAffinitySymmetricWeight represents the weight of implicit PreferredDuringScheduling affinity rule, in the range 1-100.
alwaysCheckAllPredicates [Required]
bool		When AlwaysCheckAllPredicates is set to true, scheduler checks all the configured predicates even after one or more of them fails. When the flag is set to false, scheduler skips checking the rest of the predicates after it finds one predicate that failed.

ExtenderManagedResource

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ExtenderManagedResource describes the arguments of extended resources managed by an extender.

FieldDescription
name [Required]
string		Name is the extended resource name.
ignoredByScheduler [Required]
bool		IgnoredByScheduler indicates whether kube-scheduler should ignore this resource when applying predicates.

ExtenderTLSConfig

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ExtenderTLSConfig contains settings to enable TLS with extender

FieldDescription
insecure [Required]
bool		Server should be accessed without verifying the TLS certificate. For testing only.
serverName [Required]
string		ServerName is passed to the server for SNI and is used in the client to check server certificates against. If ServerName is empty, the hostname used to contact the server is used.
certFile [Required]
string		Server requires TLS client certificate authentication
keyFile [Required]
string		Server requires TLS client certificate authentication
caFile [Required]
string		Trusted root certificates for server
certData [Required]
[]byte		CertData holds PEM-encoded bytes (typically read from a client certificate file). CertData takes precedence over CertFile
keyData [Required]
[]byte		KeyData holds PEM-encoded bytes (typically read from a client certificate key file). KeyData takes precedence over KeyFile
caData [Required]
[]byte		CAData holds PEM-encoded bytes (typically read from a root certificates bundle). CAData takes precedence over CAFile

LabelPreference

Appears in:

LabelPreference holds the parameters that are used to configure the corresponding priority function

FieldDescription
label [Required]
string		Used to identify node "groups"
presence [Required]
bool		This is a boolean flag If true, higher priority is given to nodes that have the label If false, higher priority is given to nodes that do not have the label

LabelsPresence

Appears in:

LabelsPresence holds the parameters that are used to configure the corresponding predicate in scheduler policy configuration.

FieldDescription
labels [Required]
[]string		The list of labels that identify node "groups" All of the labels should be either present (or absent) for the node to be considered a fit for hosting the pod
presence [Required]
bool		The boolean flag that indicates whether the labels should be present or absent from the node

LegacyExtender

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LegacyExtender holds the parameters used to communicate with the extender. If a verb is unspecified/empty, it is assumed that the extender chose not to provide that extension.

FieldDescription
urlPrefix [Required]
string		URLPrefix at which the extender is available
filterVerb [Required]
string		Verb for the filter call, empty if not supported. This verb is appended to the URLPrefix when issuing the filter call to extender.
preemptVerb [Required]
string		Verb for the preempt call, empty if not supported. This verb is appended to the URLPrefix when issuing the preempt call to extender.
prioritizeVerb [Required]
string		Verb for the prioritize call, empty if not supported. This verb is appended to the URLPrefix when issuing the prioritize call to extender.
weight [Required]
int64		The numeric multiplier for the node scores that the prioritize call generates. The weight should be a positive integer
bindVerb [Required]
string		Verb for the bind call, empty if not supported. This verb is appended to the URLPrefix when issuing the bind call to extender. If this method is implemented by the extender, it is the extender's responsibility to bind the pod to apiserver. Only one extender can implement this function.
enableHttps [Required]
bool		EnableHTTPS specifies whether https should be used to communicate with the extender
tlsConfig [Required]
ExtenderTLSConfig		TLSConfig specifies the transport layer security config
httpTimeout [Required]
time.Duration		HTTPTimeout specifies the timeout duration for a call to the extender. Filter timeout fails the scheduling of the pod. Prioritize timeout is ignored, k8s/other extenders priorities are used to select the node.
nodeCacheCapable [Required]
bool		NodeCacheCapable specifies that the extender is capable of caching node information, so the scheduler should only send minimal information about the eligible nodes assuming that the extender already cached full details of all nodes in the cluster
managedResources
[]ExtenderManagedResource		ManagedResources is a list of extended resources that are managed by this extender. - A pod will be sent to the extender on the Filter, Prioritize and Bind (if the extender is the binder) phases iff the pod requests at least one of the extended resources in this list. If empty or unspecified, all pods will be sent to this extender. - If IgnoredByScheduler is set to true for a resource, kube-scheduler will skip checking the resource in predicates.
ignorable [Required]
bool		Ignorable specifies if the extender is ignorable, i.e. scheduling should not fail when the extender returns an error or is not reachable.

PredicateArgument

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PredicateArgument represents the arguments to configure predicate functions in scheduler policy configuration. Only one of its members may be specified

FieldDescription
serviceAffinity [Required]
ServiceAffinity		The predicate that provides affinity for pods belonging to a service It uses a label to identify nodes that belong to the same "group"
labelsPresence [Required]
LabelsPresence		The predicate that checks whether a particular node has a certain label defined or not, regardless of value

PredicatePolicy

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PredicatePolicy describes a struct of a predicate policy.

FieldDescription
name [Required]
string		Identifier of the predicate policy For a custom predicate, the name can be user-defined For the Kubernetes provided predicates, the name is the identifier of the pre-defined predicate
argument [Required]
PredicateArgument		Holds the parameters to configure the given predicate

PriorityArgument

Appears in:

PriorityArgument represents the arguments to configure priority functions in scheduler policy configuration. Only one of its members may be specified

FieldDescription
serviceAntiAffinity [Required]
ServiceAntiAffinity		The priority function that ensures a good spread (anti-affinity) for pods belonging to a service It uses a label to identify nodes that belong to the same "group"
labelPreference [Required]
LabelPreference		The priority function that checks whether a particular node has a certain label defined or not, regardless of value
requestedToCapacityRatioArguments [Required]
RequestedToCapacityRatioArguments		The RequestedToCapacityRatio priority function is parametrized with function shape.

PriorityPolicy

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PriorityPolicy describes a struct of a priority policy.

FieldDescription
name [Required]
string		Identifier of the priority policy For a custom priority, the name can be user-defined For the Kubernetes provided priority functions, the name is the identifier of the pre-defined priority function
weight [Required]
int64		The numeric multiplier for the node scores that the priority function generates The weight should be non-zero and can be a positive or a negative integer
argument [Required]
PriorityArgument		Holds the parameters to configure the given priority function

RequestedToCapacityRatioArguments

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RequestedToCapacityRatioArguments holds arguments specific to RequestedToCapacityRatio priority function.

FieldDescription
shape [Required]
[]UtilizationShapePoint		Array of point defining priority function shape.
resources [Required]
[]ResourceSpec		No description provided.

ResourceSpec

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ResourceSpec represents single resource and weight for bin packing of priority RequestedToCapacityRatioArguments.

FieldDescription
name [Required]
string		Name of the resource to be managed by RequestedToCapacityRatio function.
weight [Required]
int64		Weight of the resource.

ServiceAffinity

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ServiceAffinity holds the parameters that are used to configure the corresponding predicate in scheduler policy configuration.

FieldDescription
labels [Required]
[]string		The list of labels that identify node "groups" All of the labels should match for the node to be considered a fit for hosting the pod

ServiceAntiAffinity

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ServiceAntiAffinity holds the parameters that are used to configure the corresponding priority function

FieldDescription
label [Required]
string		Used to identify node "groups"

UtilizationShapePoint

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UtilizationShapePoint represents single point of priority function shape.

FieldDescription
utilization [Required]
int32		Utilization (x axis). Valid values are 0 to 100. Fully utilized node maps to 100.
score [Required]
int32		Score assigned to given utilization (y axis). Valid values are 0 to 10.
Last modified February 18, 2021 at 2:14 PM PST: Add reference doc for kube-scheduler policy (4d20ce5b29)