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Customizing control plane configuration with kubeadm
Kubernetes v1.12 [stable]
The kubeadm ClusterConfiguration
object exposes the field extraArgs
that can override the default flags passed to control plane
components such as the APIServer, ControllerManager and Scheduler. The components are defined using the following fields:
apiServer
controllerManager
scheduler
The extraArgs
field consist of key: value
pairs. To override a flag for a control plane component:
- Add the appropriate fields to your configuration.
- Add the flags to override to the field.
- Run
kubeadm init
with--config <YOUR CONFIG YAML>
.
For more details on each field in the configuration you can navigate to our API reference pages.
Note: You can generate aClusterConfiguration
object with default values by runningkubeadm config print init-defaults
and saving the output to a file of your choice.
APIServer flags
For details, see the reference documentation for kube-apiserver.
Example usage:
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.16.0
apiServer:
extraArgs:
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/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.16.0
controllerManager:
extraArgs:
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/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.16.0
scheduler:
extraArgs:
address: 0.0.0.0
config: /home/johndoe/schedconfig.yaml
kubeconfig: /home/johndoe/kubeconfig.yaml