You can customize the parameters of control plane components in a Container Service for Kubernetes (ACK) cluster to meet production needs. You can modify the parameters of kube-apiserver, kube-controller-manager, cloud-controller-manager, and kube-scheduler based on your requirements. This topic describes how to customize the parameters of control plane components in the ACK console.
Usage notes
To ensure control plane stability, only ACK Pro clusters, ACK Serverless Pro clusters, ACK Edge Pro clusters, and ACK Lingjun clusters support custom configuration of some core control plane component parameters. The supported parameters are subject to the ACK console.
Some parameters are only available for specific cluster versions. To upgrade your clusters, see Manually upgrade ACK clusters.
After you modify the parameters, the control plane is automatically restarted. Perform this change during off-peak hours.
Custom parameters will override default cluster parameters. When configuring custom parameters:
Ensure parameter accuracy and completeness
Verify syntax to prevent control plane startup failures
For parameter specifications, see the following official Kubernetes documentation: kube-apiserver, kube-controller-manager, and kube-scheduler.
Customize the parameters of a control plane component
The procedures for customizing the parameters of different components are similar. The following example shows how to customize the parameters of kube-apiserver.
Log on to the ACK console. In the left-side navigation pane, click Clusters.
On the Clusters page, find the one you want to manage and click its name. In the left-side navigation pane, choose .
In the Core Components section, find the component and click Configuration in the lower-right corner of the card.
In the Kube Scheduler Parameters dialog box, configure the parameters and click OK. Make sure that the values of the parameters are valid and complete.
Default parameters
ACK managed Pro clusters
Component | Parameter | Description |
Kube API Server | enableAdmissionPlugins | By default, this parameter is empty. |
serviceNodePortRange | Valid values: 10000 to 65535. By default, this parameter is left empty. Important Exercise caution when you modify the node port range. Ensure the node port range does not overlap with the Linux kernel's | |
requestTimeout | By default, this parameter is empty. | |
defaultNotReadyTolerationSeconds | By default, this parameter is empty. | |
defaultUnreachableTolerationSeconds | By default, this parameter is empty. | |
maxMutatingRequestsInflight | Valid values: 1 to 1000. By default, this parameter is left empty. | |
maxRequestsInflight | Valid values: 1 to 3000. By default, this parameter is left empty. | |
featureGates | The following options are supported: Note The | |
oidcIssuerURL | This parameter is empty by default and supported in Kubernetes 1.18 and later. Important
| |
oidcClientId | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcUsernameClaim | Default value: | |
oidcUsernamePrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsPrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcRequiredClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcCAContent | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
hostAliases | This parameter is empty by default and supported in Kubernetes 1.26 and later. | |
enableTrace | This parameter is empty by default and supported in Kubernetes 1.28 and later. | |
samplingRatePerMillion | ||
Kube Controller Manager | horizontalPodAutoscalerSyncPeriod | By default, this parameter is empty. |
horizontalPodAutoscalerTolerance | By default, this parameter is empty. | |
concurrentTTLAfterFinishedSyncs | By default, this parameter is empty. | |
concurrentHorizontalPodAutoscalerSyncs | This parameter is empty by default and supported in Kubernetes 1.26 and later. | |
largeClusterSizeThreshold | By default, this parameter is empty. | |
unhealthyZoneThreshold | By default, this parameter is left empty. | |
secondaryNodeEvictionRate | By default, this parameter is empty. | |
nodeEvictionRate | By default, this parameter is empty. | |
terminatedPodGCThreshold | By default, this parameter is left empty. | |
kubeAPIQPS | Valid values: 1 to 1000. By default, this parameter is left empty. | |
kubeAPIBurst | Valid values: 1 to 1000. By default, this parameter is left empty. | |
concurrentCSRSyncs | This parameter is empty by default and supported in Kubernetes 1.32 and later. | |
concurrentNodeTaintSyncs | This parameter is empty by default and supported in Kubernetes 1.32 and later. | |
featureGates | The | |
Cloud Controller Manager | routeTableIDs | By default, this parameter is left empty. If the virtual private cloud (VPC) where the cluster resides has multiple route tables, you can specify multiple route table IDs that are separated by commas (,). Example: |
Kube Scheduler | For more information about how to customize the parameters of kube-scheduler, see Custom parameters of kube-scheduler. |
ACK Serverless Pro clusters
Component | Parameter | Description |
Kube API Server | enableAdmissionPlugins | By default, this parameter is empty. |
requestTimeout | By default, this parameter is empty. | |
defaultNotReadyTolerationSeconds | By default, this parameter is empty. | |
defaultUnreachableTolerationSeconds | By default, this parameter is empty. | |
maxMutatingRequestsInflight | Valid values: 1 to 1000. By default, this parameter is left empty. | |
maxRequestsInflight | Valid values: 1 to 3000. By default, this parameter is left empty. | |
featureGates | The following options are supported: Note The | |
oidcIssuerURL | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcClientId | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcUsernameClaim | Default value: | |
oidcUsernamePrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsPrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcRequiredClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcCAContent | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
Kube Controller Manager | horizontalPodAutoscalerSyncPeriod | By default, this parameter is empty. |
horizontalPodAutoscalerTolerance | By default, this parameter is empty. | |
concurrentTTLAfterFinishedSyncs | By default, this parameter is empty. | |
kubeAPIQPS | Valid values: 1 to 1000. By default, this parameter is left empty. | |
kubeAPIBurst | Valid values: 1 to 1000. By default, this parameter is left empty. | |
featureGates | The | |
Kube Scheduler | Multiple parameters. You can customize the parameters only if you are included in the whitelist. | For more information about how to customize the parameters of kube-scheduler, see Custom parameters of kube-scheduler. |
ACK Edge Pro clusters
Component | Parameter | Description |
Kube API Server | enableAdmissionPlugins | By default, this parameter is empty. |
serviceNodePortRange | Valid values: 10000 to 65535. By default, this parameter is left empty. Important Exercise caution when you modify the node port range. Make sure that the node port range does not overlap with the port range specified by the | |
requestTimeout | By default, this parameter is empty. | |
defaultNotReadyTolerationSeconds | By default, this parameter is empty. | |
defaultUnreachableTolerationSeconds | By default, this parameter is empty. | |
maxMutatingRequestsInflight | Valid values: 1 to 1000. By default, this parameter is left empty. | |
maxRequestsInflight | Valid values: 1 to 3000. By default, this parameter is left empty. | |
featureGates | The following options are supported: Note The | |
oidcIssuerURL | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcClientId | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcUsernameClaim | Default value: | |
oidcUsernamePrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsPrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcRequiredClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcCAContent | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
Kube Controller Manager | horizontalPodAutoscalerSyncPeriod | By default, this parameter is empty. |
concurrentTTLAfterFinishedSyncs | By default, this parameter is empty. | |
largeClusterSizeThreshold | By default, this parameter is empty. | |
unhealthyZoneThreshold | By default, this parameter is empty. | |
secondaryNodeEvictionRate | By default, this parameter is empty. | |
nodeEvictionRate | By default, this parameter is empty. | |
podEvictionTimeout | By default, this parameter is empty. | |
kubeAPIQPS | Valid values: 1 to 1000. By default, this parameter is left empty. | |
kubeAPIBurst | Valid values: 1 to 1000. By default, this parameter is left empty. | |
featureGates | The | |
Cloud Controller Manager | routeTableIDs | By default, this parameter is left empty. If the VPC where the cluster resides has multiple route tables, you can specify multiple route table IDs that are separated by commas (,). Example: |
Kube Scheduler | For more information about how to customize the parameters of kube-scheduler, see Custom parameters of kube-scheduler. |
ACK Lingjun clusters
Component | Parameter | Description |
Kube API Server | enableAdmissionPlugins | By default, this parameter is empty. |
serviceNodePortRange | Valid values: 10000 to 65535. By default, this parameter is left empty. Important Exercise caution when you modify the node port range. Ensure the node port range does not overlap with the Linux kernel's | |
requestTimeout | By default, this parameter is empty. | |
defaultNotReadyTolerationSeconds | By default, this parameter is empty. | |
defaultUnreachableTolerationSeconds | By default, this parameter is empty. | |
maxMutatingRequestsInflight | Valid values: 1 to 1000. By default, this parameter is left empty. | |
maxRequestsInflight | Valid values: 1 to 3000. By default, this parameter is left empty. | |
featureGates | The following options are supported: Note The | |
oidcIssuerURL | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcClientId | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcUsernameClaim | Default value: | |
oidcUsernamePrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsPrefix | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcGroupsClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcRequiredClaim | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
oidcCAContent | This parameter is empty by default and supported in Kubernetes 1.18 and later. | |
Kube Controller Manager | horizontalPodAutoscalerSyncPeriod | By default, this parameter is empty. |
horizontalPodAutoscalerTolerance | By default, this parameter is empty. | |
concurrentTTLAfterFinishedSyncs | By default, this parameter is empty. | |
largeClusterSizeThreshold | By default, this parameter is empty. | |
unhealthyZoneThreshold | By default, this parameter is empty. | |
secondaryNodeEvictionRate | By default, this parameter is empty. | |
nodeEvictionRate | By default, this parameter is empty. | |
podEvictionTimeout | By default, this parameter is empty. | |
kubeAPIQPS | Valid values: 1 to 1000. By default, this parameter is left empty. | |
kubeAPIBurst | Valid values: 1 to 1000. By default, this parameter is left empty. | |
featureGates | The | |
Cloud Controller Manager | routeTableIDs | By default, this parameter is left empty. If the VPC where the cluster resides has multiple route tables, you can specify multiple route table IDs that are separated by commas (,). Example: |
Kube Scheduler | For more information about how to customize the parameters of kube-scheduler, see Custom parameters of kube-scheduler. |