kube-scheduler - Man Page

Eric Paris Jan 2015


kube-scheduler [Options]


The Kubernetes scheduler is a control plane process which assigns Pods to Nodes. The scheduler determines which Nodes are valid placements for each Pod in the scheduling queue according to constraints and available resources. The scheduler then ranks each valid Node and binds the Pod to a suitable Node. Multiple different schedulers may be used within a cluster; kube-scheduler is the reference implementation. See scheduling ⟨https://kubernetes.io/docs/concepts/scheduling-eviction/⟩ for more information about scheduling and the kube-scheduler component.


--add-dir-header=false If true, adds the file directory to the header of the log messages

--address="" DEPRECATED: the IP address on which to listen for the --port port (set to for all IPv4 interfaces and :: for all IPv6 interfaces). See --bind-address instead.

--algorithm-provider="" DEPRECATED: the scheduling algorithm provider to use, this sets the default plugins for component config profiles. Choose one of: ClusterAutoscalerProvider | DefaultProvider

--alsologtostderr=false log to standard error as well as files

--authentication-kubeconfig="" kubeconfig file pointing at the 'core' kubernetes server with enough rights to create tokenreviews.authentication.k8s.io. This is optional. If empty, all token requests are considered to be anonymous and no client CA is looked up in the cluster.

--authentication-skip-lookup=false If false, the authentication-kubeconfig will be used to lookup missing authentication configuration from the cluster.

--authentication-token-webhook-cache-ttl=10s The duration to cache responses from the webhook token authenticator.

--authentication-tolerate-lookup-failure=true If true, failures to look up missing authentication configuration from the cluster are not considered fatal. Note that this can result in authentication that treats all requests as anonymous.

--authorization-always-allow-paths=[/healthz] A list of HTTP paths to skip during authorization, i.e. these are authorized without contacting the 'core' kubernetes server.

--authorization-kubeconfig="" kubeconfig file pointing at the 'core' kubernetes server with enough rights to create subjectaccessreviews.authorization.k8s.io. This is optional. If empty, all requests not skipped by authorization are forbidden.

--authorization-webhook-cache-authorized-ttl=10s The duration to cache 'authorized' responses from the webhook authorizer.

--authorization-webhook-cache-unauthorized-ttl=10s The duration to cache 'unauthorized' responses from the webhook authorizer.

--azure-container-registry-config="" Path to the file containing Azure container registry configuration information.

--bind-address= The IP address on which to listen for the --secure-port port. The associated interface(s) must be reachable by the rest of the cluster, and by CLI/web clients. If blank or an unspecified address ( or ::), all interfaces will be used.

--cert-dir="" The directory where the TLS certs are located. If --tls-cert-file and --tls-private-key-file are provided, this flag will be ignored.

--client-ca-file="" If set, any request presenting a client certificate signed by one of the authorities in the client-ca-file is authenticated with an identity corresponding to the CommonName of the client certificate.

--config="" The path to the configuration file. The following flags can overwrite fields in this file:


--contention-profiling=true DEPRECATED: enable lock contention profiling, if profiling is enabled

--feature-gates= A set of key=value pairs that describe feature gates for alpha/experimental features. Options are: APIListChunking=true|false (BETA - default=true) APIPriorityAndFairness=true|false (ALPHA - default=false) APIResponseCompression=true|false (BETA - default=true) AllAlpha=true|false (ALPHA - default=false) AllBeta=true|false (BETA - default=false) AllowInsecureBackendProxy=true|false (BETA - default=true) AnyVolumeDataSource=true|false (ALPHA - default=false) AppArmor=true|false (BETA - default=true) BalanceAttachedNodeVolumes=true|false (ALPHA - default=false) BoundServiceAccountTokenVolume=true|false (ALPHA - default=false) CPUManager=true|false (BETA - default=true) CRIContainerLogRotation=true|false (BETA - default=true) CSIInlineVolume=true|false (BETA - default=true) CSIMigration=true|false (BETA - default=true) CSIMigrationAWS=true|false (BETA - default=false) CSIMigrationAWSComplete=true|false (ALPHA - default=false) CSIMigrationAzureDisk=true|false (BETA - default=false) CSIMigrationAzureDiskComplete=true|false (ALPHA - default=false) CSIMigrationAzureFile=true|false (ALPHA - default=false) CSIMigrationAzureFileComplete=true|false (ALPHA - default=false) CSIMigrationGCE=true|false (BETA - default=false) CSIMigrationGCEComplete=true|false (ALPHA - default=false) CSIMigrationOpenStack=true|false (BETA - default=false) CSIMigrationOpenStackComplete=true|false (ALPHA - default=false) CSIMigrationvSphere=true|false (BETA - default=false) CSIMigrationvSphereComplete=true|false (BETA - default=false) CSIStorageCapacity=true|false (ALPHA - default=false) CSIVolumeFSGroupPolicy=true|false (ALPHA - default=false) ConfigurableFSGroupPolicy=true|false (ALPHA - default=false) CustomCPUCFSQuotaPeriod=true|false (ALPHA - default=false) DefaultPodTopologySpread=true|false (ALPHA - default=false) DevicePlugins=true|false (BETA - default=true) DisableAcceleratorUsageMetrics=true|false (ALPHA - default=false) DynamicKubeletConfig=true|false (BETA - default=true) EndpointSlice=true|false (BETA - default=true) EndpointSliceProxying=true|false (BETA - default=true) EphemeralContainers=true|false (ALPHA - default=false) ExpandCSIVolumes=true|false (BETA - default=true) ExpandInUsePersistentVolumes=true|false (BETA - default=true) ExpandPersistentVolumes=true|false (BETA - default=true) ExperimentalHostUserNamespaceDefaulting=true|false (BETA - default=false) GenericEphemeralVolume=true|false (ALPHA - default=false) HPAScaleToZero=true|false (ALPHA - default=false) HugePageStorageMediumSize=true|false (BETA - default=true) HyperVContainer=true|false (ALPHA - default=false) IPv6DualStack=true|false (ALPHA - default=false) ImmutableEphemeralVolumes=true|false (BETA - default=true) KubeletPodResources=true|false (BETA - default=true) LegacyNodeRoleBehavior=true|false (BETA - default=true) LocalStorageCapacityIsolation=true|false (BETA - default=true) LocalStorageCapacityIsolationFSQuotaMonitoring=true|false (ALPHA - default=false) NodeDisruptionExclusion=true|false (BETA - default=true) NonPreemptingPriority=true|false (BETA - default=true) PodDisruptionBudget=true|false (BETA - default=true) PodOverhead=true|false (BETA - default=true) ProcMountType=true|false (ALPHA - default=false) QOSReserved=true|false (ALPHA - default=false) RemainingItemCount=true|false (BETA - default=true) RemoveSelfLink=true|false (ALPHA - default=false) RotateKubeletServerCertificate=true|false (BETA - default=true) RunAsGroup=true|false (BETA - default=true) RuntimeClass=true|false (BETA - default=true) SCTPSupport=true|false (BETA - default=true) SelectorIndex=true|false (BETA - default=true) ServerSideApply=true|false (BETA - default=true) ServiceAccountIssuerDiscovery=true|false (ALPHA - default=false) ServiceAppProtocol=true|false (BETA - default=true) ServiceNodeExclusion=true|false (BETA - default=true) ServiceTopology=true|false (ALPHA - default=false) SetHostnameAsFQDN=true|false (ALPHA - default=false) StartupProbe=true|false (BETA - default=true) StorageVersionHash=true|false (BETA - default=true) SupportNodePidsLimit=true|false (BETA - default=true) SupportPodPidsLimit=true|false (BETA - default=true) Sysctls=true|false (BETA - default=true) TTLAfterFinished=true|false (ALPHA - default=false) TokenRequest=true|false (BETA - default=true) TokenRequestProjection=true|false (BETA - default=true) TopologyManager=true|false (BETA - default=true) ValidateProxyRedirects=true|false (BETA - default=true) VolumeSnapshotDataSource=true|false (BETA - default=true) WarningHeaders=true|false (BETA - default=true) WinDSR=true|false (ALPHA - default=false) WinOverlay=true|false (ALPHA - default=false) WindowsEndpointSliceProxying=true|false (ALPHA - default=false)

--hard-pod-affinity-symmetric-weight=1 DEPRECATED: RequiredDuringScheduling affinity is not symmetric, but there is an implicit PreferredDuringScheduling affinity rule corresponding to every RequiredDuringScheduling affinity rule. --hard-pod-affinity-symmetric-weight represents the weight of implicit PreferredDuringScheduling affinity rule. Must be in the range 0-100.This option was moved to the policy configuration file

-h, --help=false help for kube-scheduler

--http2-max-streams-per-connection=0 The limit that the server gives to clients for the maximum number of streams in an HTTP/2 connection. Zero means to use golang's default.

--kube-api-burst=100 DEPRECATED: burst to use while talking with kubernetes apiserver

--kube-api-content-type="application/vnd.kubernetes.protobuf" DEPRECATED: content type of requests sent to apiserver.

--kube-api-qps=50 DEPRECATED: QPS to use while talking with kubernetes apiserver

--kubeconfig="" DEPRECATED: path to kubeconfig file with authorization and master location information.

--leader-elect=true Start a leader election client and gain leadership before executing the main loop. Enable this when running replicated components for high availability.

--leader-elect-lease-duration=15s The duration that non-leader candidates will wait after observing a leadership renewal until attempting to acquire leadership of a led but unrenewed leader slot. This is effectively the maximum duration that a leader can be stopped before it is replaced by another candidate. This is only applicable if leader election is enabled.

--leader-elect-renew-deadline=10s The interval between attempts by the acting master to renew a leadership slot before it stops leading. This must be less than or equal to the lease duration. This is only applicable if leader election is enabled.

--leader-elect-resource-lock="endpointsleases" The type of resource object that is used for locking during leader election. Supported options are 'endpoints', 'configmaps', 'leases', 'endpointsleases' and 'configmapsleases'.

--leader-elect-resource-name="kube-scheduler" The name of resource object that is used for locking during leader election.

--leader-elect-resource-namespace="kube-system" The namespace of resource object that is used for locking during leader election.

--leader-elect-retry-period=2s The duration the clients should wait between attempting acquisition and renewal of a leadership. This is only applicable if leader election is enabled.

--lock-object-name="kube-scheduler" DEPRECATED: define the name of the lock object. Will be removed in favor of leader-elect-resource-name

--lock-object-namespace="kube-system" DEPRECATED: define the namespace of the lock object. Will be removed in favor of leader-elect-resource-namespace.

--log-backtrace-at=:0 when logging hits line file:N, emit a stack trace

--log-dir="" If non-empty, write log files in this directory

--log-file="" If non-empty, use this log file

--log-file-max-size=1800 Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited.

--log-flush-frequency=5s Maximum number of seconds between log flushes

--logging-format="text" Sets the log format. Permitted formats: "json", "text". Non-default formats don't honor these flags: --add_dir_header, --alsologtostderr, --log_backtrace_at, --log_dir, --log_file, --log_file_max_size, --logtostderr, --skip_headers, --skip_log_headers, --stderrthreshold, --vmodule, --log-flush-frequency. Non-default choices are currently alpha and subject to change without warning.

--logtostderr=true log to standard error instead of files

--master="" The address of the Kubernetes API server (overrides any value in kubeconfig)

--permit-port-sharing=false If true, SO_REUSEPORT will be used when binding the port, which allows more than one instance to bind on the same address and port. [default=false]

--policy-config-file="" DEPRECATED: file with scheduler policy configuration. This file is used if policy ConfigMap is not provided or --use-legacy-policy-config=true. Note: The scheduler will fail if this is combined with Plugin configs

--policy-configmap="" DEPRECATED: name of the ConfigMap object that contains scheduler's policy configuration. It must exist in the system namespace before scheduler initialization if --use-legacy-policy-config=false. The config must be provided as the value of an element in 'Data' map with the key='policy.cfg'. Note: The scheduler will fail if this is combined with Plugin configs

--policy-configmap-namespace="kube-system" DEPRECATED: the namespace where policy ConfigMap is located. The kube-system namespace will be used if this is not provided or is empty. Note: The scheduler will fail if this is combined with Plugin configs

--port=10251 DEPRECATED: the port on which to serve HTTP insecurely without authentication and authorization. If 0, don't serve plain HTTP at all. See --secure-port instead.

--profiling=true DEPRECATED: enable profiling via web interface host:port/debug/pprof/

--requestheader-allowed-names=[] List of client certificate common names to allow to provide usernames in headers specified by --requestheader-username-headers. If empty, any client certificate validated by the authorities in --requestheader-client-ca-file is allowed.

--requestheader-client-ca-file="" Root certificate bundle to use to verify client certificates on incoming requests before trusting usernames in headers specified by --requestheader-username-headers. WARNING: generally do not depend on authorization being already done for incoming requests.

--requestheader-extra-headers-prefix=[x-remote-extra-] List of request header prefixes to inspect. X-Remote-Extra- is suggested.

--requestheader-group-headers=[x-remote-group] List of request headers to inspect for groups. X-Remote-Group is suggested.

--requestheader-username-headers=[x-remote-user] List of request headers to inspect for usernames. X-Remote-User is common.

--scheduler-name="default-scheduler" DEPRECATED: name of the scheduler, used to select which pods will be processed by this scheduler, based on pod's "spec.schedulerName".

--secure-port=10259 The port on which to serve HTTPS with authentication and authorization. If 0, don't serve HTTPS at all.

--show-hidden-metrics-for-version="" The previous version for which you want to show hidden metrics. Only the previous minor version is meaningful, other values will not be allowed. The format is ., e.g.: '1.16'. The purpose of this format is make sure you have the opportunity to notice if the next release hides additional metrics, rather than being surprised when they are permanently removed in the release after that.

--skip-headers=false If true, avoid header prefixes in the log messages

--skip-log-headers=false If true, avoid headers when opening log files

--stderrthreshold=2 logs at or above this threshold go to stderr

--tls-cert-file="" File containing the default x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert). If HTTPS serving is enabled, and --tls-cert-file and --tls-private-key-file are not provided, a self-signed certificate and key are generated for the public address and saved to the directory specified by --cert-dir.


--tls-min-version="" Minimum TLS version supported. Possible values: VersionTLS10, VersionTLS11, VersionTLS12, VersionTLS13

--tls-private-key-file="" File containing the default x509 private key matching --tls-cert-file.

--tls-sni-cert-key=[] A pair of x509 certificate and private key file paths, optionally suffixed with a list of domain patterns which are fully qualified domain names, possibly with prefixed wildcard segments. The domain patterns also allow IP addresses, but IPs should only be used if the apiserver has visibility to the IP address requested by a client. If no domain patterns are provided, the names of the certificate are extracted. Non-wildcard matches trump over wildcard matches, explicit domain patterns trump over extracted names. For multiple key/certificate pairs, use the --tls-sni-cert-key multiple times. Examples: "example.crt,example.key" or "foo.crt,foo.key:*.foo.com,foo.com".

--use-legacy-policy-config=false DEPRECATED: when set to true, scheduler will ignore policy ConfigMap and uses policy config file. Note: The scheduler will fail if this is combined with Plugin configs

-v, --v=0 number for the log level verbosity

--version=false Print version information and quit

--vmodule= comma-separated list of pattern=N settings for file-filtered logging

--write-config-to="" If set, write the configuration values to this file and exit.


January 2015, Originally compiled by Eric Paris (eparis at redhat dot com) based on the kubernetes source material, but hopefully they have been automatically generated since!


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