Refactor NFD into a simple server-client system. Labeling is now done by
a separate 'nfd-master' server. It is a simple service with small
codebase, designed for easy isolation. The feature discovery part is
implemented in a 'nfd-worker' client which sends labeling requests to
nfd-server, thus, requiring no access/permissions to the Kubernetes API
itself.
Client-server communication is implemented by using gRPC. The protocol
currently consists of only one request, i.e. the labeling request.
The spec templates are converted to the new scheme. The nfd-master
server can be deployed using the nfd-master.yaml.template which now also
contains the necessary RBAC configuration. NFD workers can be deployed
by using the nfd-worker-daemonset.yaml.template or
nfd-worker-job.yaml.template (most easily used with the label-nodes.sh
script).
Only nfd-worker currently support config file or options. The (default)
NFD config file is renamed to nfd-worker.conf.
Add new config option for specifying the device label, i.e. the
<device-label> part in
node.alpha.kubernetes-incubator.io/nfd-pci-<device label>.present
The option is a list of field names:
"class" PCI device class
"vendor" Vendor ID
"device" Device ID
"subsystem_vendor" Subsystem vendor ID
"subsystem_device" Subsystem device ID
E.g. the following command line flag can be used to use all of the
above:
--options='{"sources": {"pci": {"deviceLabelFields": ["class", "vendor", "device", "subsystem_vendor", "subsystem_device"] } } }'
User can now configure the list of device classes to detect, either via
a configuration file or by using the --options command line flag.
An example of a command line flag to detect all network controllers and
("main class 0x02) and VGA display controllers ("main" class 0x03 and
subclass 0x00) would be:
--options='{"sources": {"pci": {"deviceClassWhitelist": ["02", "0300"] } } }'
Support yaml/json based config file for nfd. This commit does not add
any actual consumers for the config file, yet.
By default, nfd tries to read
/etc/kubernetes/node-feature-discovery/node-feature-discovery.conf.
This can be changed by specifying the --config command line flag.
