OpenShift Container Platform

Enable Device Manager

Enable Device Manager to allow device plugins to advertise specialized node hardware resources and make them available to pods without requiring code changes.

Enable Device Manager to implement a device plugin to advertise specialized hardware without any upstream code changes.

Device Manager provides a mechanism for advertising specialized node hardware resources with the help of plugins known as device plugins.

Procedure

Obtain the label associated with the static MachineConfigPool CRD for the type of node you want to configure by entering the following command. Perform one of the following steps:
1. View the machine config:
  # oc describe machineconfig <name>
  For example:
  # oc describe machineconfig 00-worker
  Example output
  Name: 00-worker Namespace: Labels: machineconfiguration.openshift.io/role=worker
  machineconfiguration.openshift.io is the label required for the Device Manager.
Create a custom resource (CR) for your configuration change.
Sample configuration for a Device Manager CR
```
apiVersion: machineconfiguration.openshift.io/v1
kind: KubeletConfig
metadata:
  name: devicemgr
spec:
  machineConfigPoolSelector:
    matchLabels:
       machineconfiguration.openshift.io: devicemgr
  kubeletConfig:
    feature-gates:
      - DevicePlugins=true
```
where:

metadata.name

Specifies a name to assign to the CR.

spec.machineConfigPoolSelector.matchLabels

Specifies the label from the Machine Config Pool.

spec.kubeletConfig.feature-gates

Specifies the DevicePlugins feature gate. Set to true.

Create the Device Manager:

$ oc create -f devicemgr.yaml

Example output

kubeletconfig.machineconfiguration.openshift.io/devicemgr created

Ensure that Device Manager was actually enabled by confirming that /var/lib/kubelet/device-plugins/kubelet.sock is created on the node. This is the UNIX domain socket on which the Device Manager gRPC server listens for new plugin registrations. This sock file is created when the Kubelet is started only if Device Manager is enabled.