This page contains an overview of the various feature gates an administrator can specify on different Kubernetes components.
Feature gates are a set of key=value pairs that describe alpha or experimental
features.
An administrator can use the --feature-gates
command line flag on each component
to turn a feature on or off.
The following table is a summary of the feature gates that you can set on
different Kubernetes components.
Feature | Default | Stage | Since | Until |
---|---|---|---|---|
Accelerators |
false |
Alpha | 1.6 | 1.10 |
AdvancedAuditing |
false |
Alpha | 1.7 | 1.7 |
AdvancedAuditing |
true |
Beta | 1.8 | |
AffinityInAnnotations |
false |
Alpha | 1.6 | 1.7 |
AllowExtTrafficLocalEndpoints |
false |
Beta | 1.4 | 1.6 |
AllowExtTrafficLocalEndpoints |
true |
GA | 1.7 | |
APIListChunking |
false |
Alpha | 1.8 | 1.8 |
APIListChunking |
true |
Beta | 1.9 | |
APIResponseCompression |
false |
Alpha | 1.7 | |
AppArmor |
true |
Beta | 1.4 | |
BlockVolume |
false |
Alpha | 1.9 | |
CPUManager |
false |
Alpha | 1.8 | 1.9 |
CPUManager |
true |
Beta | 1.10 | |
CRIContainerLogRotation |
false |
Alpha | 1.10 | |
CSIPersistentVolume |
false |
Alpha | 1.9 | 1.9 |
CSIPersistentVolume |
true |
Beta | 1.10 | |
CustomPodDNS |
false |
Alpha | 1.9 | 1.9 |
CustomPodDNS |
true |
Beta | 1.10 | |
CustomResourceSubresources |
false |
Alpha | 1.10 | |
CustomResourceValidation |
false |
Alpha | 1.8 | 1.8 |
CustomResourceValidation |
true |
Beta | 1.9 | |
DebugContainers |
false |
Alpha | 1.10 | |
DevicePlugins |
false |
Alpha | 1.8 | 1.9 |
DevicePlugins |
true |
Beta | 1.10 | |
DynamicKubeletConfig |
false |
Alpha | 1.4 | |
DynamicVolumeProvisioning |
true |
Alpha | 1.3 | 1.7 |
DynamicVolumeProvisioning |
true |
GA | 1.8 | |
EnableEquivalenceClassCache |
false |
Alpha | 1.8 | |
ExpandPersistentVolumes |
false |
Alpha | 1.8 | 1.8 |
ExperimentalCriticalPodAnnotation |
false |
Alpha | 1.5 | |
ExperimentalHostUserNamespaceDefaulting |
false |
Beta | 1.5 | |
GCERegionalPersistentDisk |
true |
Beta | 1.10 | |
HugePages |
false |
Alpha | 1.8 | 1.9 |
HugePages |
true |
Beta | 1.10 | |
HyperVContainer |
false |
Alpha | 1.10 | |
Initializers |
false |
Alpha | 1.7 | |
KubeletConfigFile |
false |
Alpha | 1.8 | 1.9 |
LocalStorageCapacityIsolation |
false |
Alpha | 1.7 | 1.9 |
LocalStorageCapacityIsolation |
true |
Beta | 1.10 | |
MountContainers |
false |
Alpha | 1.9 | |
MountPropagation |
false |
Alpha | 1.8 | 1.9 |
MountPropagation |
true |
Beta | 1.10 | |
PersistentLocalVolumes |
false |
Alpha | 1.7 | 1.9 |
PersistentLocalVolumes |
true |
Beta | 1.10 | |
PodPriority |
false |
Alpha | 1.8 | |
PodShareProcessNamespace |
false |
Alpha | 1.10 | |
PVCProtection |
false |
Alpha | 1.9 | 1.9 |
ReadOnlyAPIDataVolumes |
true |
Deprecated | 1.10 | |
ResourceLimitsPriorityFunction |
false |
Alpha | 1.9 | |
RotateKubeletClientCertificate |
true |
Beta | 1.7 | |
RotateKubeletServerCertificate |
false |
Alpha | 1.7 | |
RunAsGroup |
false |
Alpha | 1.10 | |
ScheduleDaemonSetPods |
false |
Alpha | 1.10 | |
ServiceNodeExclusion |
false |
Alpha | 1.8 | |
StorageObjectInUseProtection |
true |
Beta | 1.10 | |
StreamingProxyRedirects |
true |
Beta | 1.5 | |
SupportIPVSProxyMode |
false |
Alpha | 1.8 | 1.8 |
SupportIPVSProxyMode |
false |
Beta | 1.9 | 1.9 |
SupportIPVSProxyMode |
true |
Beta | 1.10 | |
SupportPodPidsLimit |
false |
Alpha | 1.10 | |
TaintBasedEvictions |
false |
Alpha | 1.6 | |
TaintNodesByCondition |
false |
Alpha | 1.8 | |
TokenRequest |
false |
Alpha | 1.10 | |
VolumeScheduling |
false |
Alpha | 1.9 | 1.9 |
VolumeScheduling |
true |
Beta | 1.10 |
A feature can be in Alpha, Beta or GA stage. An Alpha feature means:
A Beta feature means:
Note: Please do try Beta features and give feedback on them! After they exit beta, it may not be practical for us to make more changes.
A GA feature is also referred to as a stable feature. It means:
Each feature gate is designed for enabling/disabling a specific feature:
Accelerators
: Enable Nvidia GPU support when using DockerAdvancedAuditing
: Enable advanced auditingAffinityInAnnotations
(deprecated): Enable setting Pod affinity or anti-affinitys.AllowExtTrafficLocalEndpoints
: Enable a service to route external requests to node local endpoints.APIListChunking
: Enable the API clients to retrieve (LIST
or GET
) resources from API server in chunks.APIResponseCompression
: Compress the API responses for LIST
or GET
requests.AppArmor
: Enable AppArmor based mandatory access control on Linux nodes when using Docker.
See AppArmor Tutorial for more details.BlockVolume
: Enable the definition and consumption of raw block devices in Pods.
See Raw Block Volume Support
for more details.CPUManager
: Enable container level CPU affinity support, see CPU Management Policies.CRIContainerLogRotation
: Enable container log rotation for cri container runtime.CSIPersistentVolume
: Enable discovering and mounting volumes provisioned through a
CSI (Container Storage Interface)
compatible volume plugin.
Check the csi
volume type documentation for more details.CustomPodDNS
: Enable customizing the DNS settings for a Pod using its dnsConfig
property.
Check Pod’s DNS Config
for more details.CustomResourceSubresources
: Enable /status
and /scale
subresources
on resources created from CustomResourceDefinition.CustomResourceValidation
: Enable schema based validation on resources created from
CustomResourceDefinition.DebugContainers
: Enable running a “debugging” container in a Pod’s namespace to
troubleshoot a running Pod.DevicePlugins
: Enable the device-plugins
based resource provisioning on nodes.DynamicKubeletConfig
: Enable the dynamic configuration of kubelet. See Reconfigure kubelet.DynamicVolumeProvisioning
(deprecated): Enable the dynamic provisioning of persistent volumes to Pods.EnableEquivalenceClassCache
: Enable the scheduler to cache equivalence of nodes when scheduling Pods.ExpandPersistentVolumes
: Enable the expanding of persistent volumes. See Expanding Persistent Volumes Claims.ExperimentalCriticalPodAnnotation
: Enable annotating specific pods as critical so that their scheduling is guaranteed.ExperimentalHostUserNamespaceDefaultingGate
: Enabling the defaulting user
namespace to host. This is for containers that are using other host namespaces,
host mounts, or containers that are privileged or using specific non-namespaced
capabilities (e.g. MKNODE
, SYS_MODULE
etc.). This should only be enabled
if user namespace remapping is enabled in the Docker daemon.GCERegionalPersistentDisk
: Enable the regional PD feature on GCE.HugePages
: Enable the allocation and consumption of pre-allocated huge pages.HyperVContainer
: Enable Hyper-V isolation for Windows containers.Intializers
: Enable the dynamic admission control
as an extension to the built-in admission controllers.
When the Initializers
admission controller is enabled, this feature is automatically enabled.KubeletConfigFile
: Enable loading kubelet configuration from a file specified using a config file.
See setting kubelet parameters via a config file for more details.LocalStorageCapacityIsolation
: Enable the consumption of local ephemeral storage and also the sizeLimit
property of an emptyDir volume.MountContainers
: Enable using utility containers on host as the volume mounter.MountPropagation
: Enable sharing volume mounted by one container to other containers or pods.
For more details, please see mount propagation.PersistentLocalVolumes
: Enable the usage of local
volume type in Pods.
Pod affinity has to be specified if requesting a local
volume.PodPriority
: Enable the descheduling and preemption of Pods based on their priorities.PVCProtection
: Enable the prevention of a PersistentVolumeClaim (PVC) from
being deleted when it is still used by any Pod.
More details can be found here.ReadOnlyAPIDataVolumes
: Set Secret, ConfigMap, DownwardAPI and projected volumes to be mounted in read-only mode.
This gate exists only for backward compatibility. It will be removed in 1.11 release.ResourceLimitsPriorityFunction
: Enable a scheduler priority function that
assigns a lowest possible score of 1 to a node that satisfies at least one of
the input Pod’s cpu and memory limits. The intent is to break ties between
nodes with same scores.RotateKubeletClientCertificate
: Enable the rotation of the client TLS certificate on the kubelet.
See kubelet configuration for more details.RotateKubeletServerCertificate
: Enable the rotation of the server TLS certificate on the kubelet.
See kubelet configuration for more details.RunAsGroup
: Enable control over the primary group ID set on the init processes of containers.ScheduleDaemonSetPods
: Enable DaemonSet Pods to be scheduled by the default scheduler instead of the DaemonSet controller.ServiceNodeExclusion
: Enable the exclusion of nodes from load balancers created by a cloud provider.
A node is eligible for exclusion if annotated with “alpha.service-controller.kubernetes.io/exclude-balancer
” key.StorageObjectInUseProtection
: Postpone the deletion of PersistentVolume or
PersistentVolumeClaim objects if they are still being used.StreamingProxyRedirects
: Instructs the API server to intercept (and follow)
redirects from the backend (kubelet) for streaming requests.
Examples of streaming requests include the exec
, attach
and port-forward
requests.SupportIPVSProxyMode
: Enable providing in-cluster service load balancing using IPVS.
See service proxies for more details.SupportPodPidsLimit
: Enable the support to limiting PIDs in Pods.TaintBasedEvictions
: Enable evicting pods from nodes based on taints on nodes and tolerations on Pods.
See taints and tolerations for more details.TaintNodesByCondition
: Enable automatic tainting nodes based on node conditions.TokenRequest
: Enable the TokenRequest
endpoint on service account resources.VolumeScheduling
: Enable volume topology aware scheduling and make the
PersistentVolumeClaim (PVC) binding aware of scheduling decisions. It also
enables the usage of local
volume
type when used together with the PersistentLocalVolumes
feature gate.