Node Feature Discovery Operator
The Cluster Node Feature Discovery operator manages detection of hardware features and configuration in a Openshift cluster. The operator orchestrates all resources needed to run the NFD DaemonSet (Upstream: https://github.com/kubernetes-sigs/node-feature-discovery)
Building the operator
Checkout the sources
$ git clone https://github.com/openshift/cluster-nfd-operator $GOPATH/src/github.com/openshift/cluster-nfd-operator
Update the Makefile and edit IMAGE_TAG and IMAGE_REGISTRY one will need those later to update the operator manifest (image: $IMAGE_REGISTRY/$IMAGE_TAG).
Update the Dockerfile with the correct golang build image and the base image the operator will run with.
Manual deploy of the operator
Checkout the sources
$ git clone https://github.com/openshift/cluster-nfd-operator
Update cluster-nfd-operator/manifests/0600_operator.yaml with the a custom image built and create all files in cluster-nfd-operator/manifests
$ cd cluster-nfd-operator/manifests
$ kubectl create -f .
$ kubectl create -f cr/nfd_cr.yaml
The operator will use the NFD image built from: https://github.com/openshift/node-feature-discovery
Extending NFD with sidecar containers and hooks
First see upstream documentation of the hook feature and how to create a correct hook file: https://github.com/kubernetes-sigs/node-feature-discovery#local-user-specific-features.
The DaemonSet running on the workers will mount the hostPath: /etc/kubernetes/node-feature-discovery/source.d. Additional hooks can than be provided by a sidecar container that is as well running on the workers and mounting the same hostpath and writing the hook executable (shell-script, compiled code, ...) to this directory.
NFD will execute any file in this directory, if one needs any configuration for the hook, a separate configuration directory can be created under /etc/kubernetes/node-feature-discovery/source.d e.g. /etc/kubernetes/node-feature-discovery/source.d/own-hook-conf, NFD will not recurse deeper into the file hierarchy.