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Customizing control plane configuration with kubeadm

The kubeadm configuration exposes the following fields that can override the default flags passed to control plane components such as the APIServer, ControllerManager and Scheduler:

These fields consist of key: value pairs. To override a flag for a control plane component:

  1. Add the appropriate field to your configuration.
  2. Add the flags to override to the field.

For more details on each field in the configuration you can navigate to our API reference pages.

APIServer flags

For details, see the reference documentation for kube-apiserver.

Example usage:

apiVersion: kubeadm.k8s.io/v1alpha3
kind: ClusterConfiguration
kubernetesVersion: v1.12.0
metadata:
  name: 1.12-sample
apiServerExtraArgs:
  advertise-address: 192.168.0.103
  anonymous-auth: false
  enable-admission-plugins: AlwaysPullImages,DefaultStorageClass
  audit-log-path: /home/johndoe/audit.log

ControllerManager flags

For details, see the reference documentation for kube-controller-manager.

Example usage:

apiVersion: kubeadm.k8s.io/v1alpha3
kind: ClusterConfiguration
kubernetesVersion: v1.12.0
metadata:
  name: 1.12-sample
controllerManagerExtraArgs:
  cluster-signing-key-file: /home/johndoe/keys/ca.key
  bind-address: 0.0.0.0
  deployment-controller-sync-period: 50

Scheduler flags

For details, see the reference documentation for kube-scheduler.

Example usage:

apiVersion: kubeadm.k8s.io/v1alpha3
kind: ClusterConfiguration
kubernetesVersion: v1.12.0
metadata:
  name: 1.12-sample
schedulerExtraArgs:
  address: 0.0.0.0
  config: /home/johndoe/schedconfig.yaml
  kubeconfig: /home/johndoe/kubeconfig.yaml