Ettus Device Plugin for Kubernetes

This code provides a Kubernetes Device Plugin to manage Ettus USRPs as Kubernetes Node Resources.

Currently tested USRPS are:

• B210.

It should work with:

• B200.
• B210.
• B200Mini.
• B205Mini.

The device plugin detects and registers connected USRPs. It also download uhd_images in node path '/usr/share/uhd/images'. When a pod request a "ettus.com/usrp" resource, the ettus device plugin automatically attach the corresponding '/dev/bus/usb/' device and mounts '/usr/share/uhd/images' hostPath in the pod.

Build Docker Image

make docker

This will create a docker image with ettus-device-plugin and uhd_images_downloader binaries.

Manual Deployment

You can run ettus-device-plugin binary manually at each node. Remember to also have uhd_images_downloader in the PATH of your nodes.

You must run it as superuser because the binary must access /dev/bus/serial and create /usr/share/uhd/images to download uhd_images.

You must have ettus device attached to host USB prior to run the ettus-device-plugin. We plan to support dynamic attach-dettach of USRPs in the future.

After running the ettus-device-plugin binary you can check if USRPs are detected and included as node resources with:

kubectl get nodes -o go-template --template='{{range .items}}{{printf "%s %s\n" .metadata.name .status.allocatable}}{{end}}'

kube-node1 map[cpu:8 ephemeral-storage:385306984Ki ettus.com/usrp:1 hugepages-1Gi:0 hugepages-2Mi:0 memory:16003440Ki pods:110]

Deploy as DaemonSet

We also include 'ettus-daemonset.yaml' to deploy ettus-device-plugin as a DaemonSet so you can rely on Kubernetes to: place the device plugin's Pod onto Nodes, to restart the daemon Pod after failure, and to help automate upgrades.

DaemonSet runs with privileged securityContext. If you have enabled pod security policy control in your cluster, you have to configure your Pod Security Policies to enable the execution of privileged pods.

Test a Pod

The following command run a pod asking for an ettus/usrp. The image openverso/ettus-uhd includes uhd libraries and examples (not the uhd images, that are automatically mounted by the ettus device plugin):

kubectl run test-usrp -ti --rm --privileged --image openverso/ettus-uhd --override-type=strategic --overrides='{"spec":{"containers":[{"name":"test-usrp","resources":{"limits":{"ettus.com/usrp":"1"}}}]}}' -- benchmark_rate --rx_rate 10e6 --tx_rate 10e6
...
Benchmark rate summary:
  Num received samples:     102221483
  Num dropped samples:      0
  Num overruns detected:    0
  Num transmitted samples:  100064040
  Num sequence errors (Tx): 0
  Num sequence errors (Rx): 0
  Num underruns detected:   0
  Num late commands:        0
  Num timeouts (Tx):        2
  Num timeouts (Rx):        0


Done!

We can also deploy an openairinterface enodeb (CTRL-C to terminate):

kubectl run test-usrp-oai -ti --rm --privileged --image openverso/oai-enb:1.2.2 -override-type=strategic --overrides='{"spec":{"containers":[{"name":"test-usrp","resources":{"limits":{"ettus.com/usrp":"1"}}}]}}'