├── .gitignore ├── Dockerfile ├── LICENSE ├── README.md ├── controller.go ├── go.mod ├── go.sum ├── k8s-dt-labeller-ds.yaml ├── k8s-dt-labeller-nfd.yaml ├── labels.go ├── labels_test.go ├── main.go ├── main_test.go └── overview.png /.gitignore: -------------------------------------------------------------------------------- 1 | .idea/ 2 | k8s-dt-node-labeller 3 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | FROM golang as builder 2 | 3 | ARG KUBECONFIG 4 | ARG NODE_NAME 5 | 6 | ENV GO111MODULE=on 7 | 8 | WORKDIR /app 9 | 10 | COPY go.mod . 11 | COPY go.sum . 12 | 13 | RUN go mod download 14 | 15 | COPY . . 16 | 17 | RUN CGO_ENABLED=0 GOOS=linux go build 18 | 19 | FROM scratch 20 | COPY --from=builder /app/k8s-dt-node-labeller /app/ 21 | 22 | ENTRYPOINT [ "/app/k8s-dt-node-labeller" ] 23 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. 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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Device Tree Kubernetes Node Labeller 2 | 3 | This tool provides a custom Kubernetes controller for automatically labelling nodes with [devicetree] properties. 4 | 5 | It is inspired by and re-uses much of the Kubernetes controller plumbing from the [amdgpu-node-labeller]. 6 | 7 | ## Use Cases 8 | 9 | `k8s-dt-node-labeller` was developed in order to facilitate targeted deployments into hybrid (e.g. armhf, arm64) 10 | Kubernetes clusters, as well as for targeting heterogeneous accelerators in Edge deployments - specifically those that 11 | show up as platform devices (FPGAs, embedded GPUs, etc.) as opposed to those that are dynamically discoverable at 12 | run-time via bus enumeration (e.g. USB, PCI). The latter cases are handled by the official [node-feature-discovery] 13 | (NFD) labeller, which can be used in conjunction with `k8s-dt-node-labeller` for more comprehensive node labelling. 14 | 15 | ## Overview 16 | 17 | `k8s-dt-node-labeller` is primarily concerned with top-level system characteristics, and therefore limits itself to 18 | walking through the top-level `devicetree` node looking for `compatible` properties to expose as Kubernetes node labels. 19 | As `k8s-dt-node-labeller` requires access to the target node's `devicetree` instance, the labeller must be run directly 20 | on the target node that is to be labelled. An overview of the general labelling flow (in the context of a Kubernetes 21 | DaemonSet) is provided below: 22 | 23 | ![Overview Diagram][overview] 24 | 25 | It is expected that the node labeller is run when the node is registered with the cluster, such that pods relying on 26 | specific labels are able to be scheduled and placed appropriately. 27 | 28 | Labelling is possible in a number of different ways: 29 | - Running Node-Local via the CLI App 30 | - Running Node-Local via Docker 31 | - Deploying as a Kubernetes DaemonSet directly 32 | - Deploying as part of a combined Kubernetes NFD DaemonSet 33 | 34 | Regardless of the method of deployment, the labels will be generated and applied to the local node. 35 | 36 | ### Limitations 37 | 38 | `k8s-dt-node-labeller` only generates labels from properties at the top-level of the `devicetree` and those specifically 39 | defined by the user by design. It does not recurse down the tree, nor does it make any attempt to enumerate busses that 40 | are better served by bus-specific device detection logic. While the labeller can attest to the existence of a node in 41 | the `devicetree`, it offers no device-specific information or control - all of which would need to be implemented 42 | through a device-specific device plugin. 43 | 44 | ## Installation 45 | 46 | If planning to use the CLI App directly, this can be compiled and installed as other Go projects: 47 | 48 | ``` 49 | $ go get github.com/adaptant-labs/k8s-dt-node-labeller 50 | ``` 51 | 52 | For Docker containers and Kubernetes deployment instructions, see below. 53 | 54 | ## Usage 55 | 56 | General usage is as follows: 57 | 58 | ``` 59 | $ k8s-dt-node-labeller --help 60 | devicetree Node Labeller for Kubernetes 61 | Usage: k8s-dt-node-labeller [flags] [-n devicetree nodes...] 62 | 63 | -d Display detected devicetree nodes 64 | -f Write detected features to NFD features file 65 | -kubeconfig string 66 | Paths to a kubeconfig. Only required if out-of-cluster. 67 | -n string 68 | Additional devicetree node names 69 | ``` 70 | 71 | A dry-run is possible by specifying the `-d` flag: 72 | 73 | ``` 74 | $ k8s-dt-node-labeller -d 75 | Discovered the following devicetree properties: 76 | 77 | beta.devicetree.org/nvidia-jetson-nano: 1 78 | beta.devicetree.org/nvidia-tegra210: 1 79 | ``` 80 | 81 | By default, `compatible` strings from the top-level `/` node are discovered and converted to node labels. Additional 82 | node specifications are possible via the `-n` flag, as below: 83 | 84 | ``` 85 | $ k8s-dt-node-labeller -d -n gpu pwm-fan 86 | Discovered the following devicetree properties: 87 | 88 | beta.devicetree.org/nvidia-jetson-nano: 1 89 | beta.devicetree.org/nvidia-tegra210: 1 90 | beta.devicetree.org/nvidia-tegra210-gm20b: 1 91 | beta.devicetree.org/nvidia-gm20b: 1 92 | beta.devicetree.org/pwm-fan: 1 93 | ``` 94 | 95 | In the case of Docker or Kubernetes Deployment, note that these arguments can also be passed on to the container 96 | directly. 97 | 98 | ### Running Node-Local via the CLI App 99 | 100 | In order to submit the labels to the cluster, ensure a valid kubeconfig can be found (e.g. by setting the `KUBECONFIG` 101 | environment variable, or through specifying the location with the `-kubeconfig` parameter) and execute the node 102 | labeller as-is: 103 | 104 | ``` 105 | $ k8s-dt-node-labeller 106 | {"level":"info","ts":1585701002.694782,"logger":"k8s-dt-node-labeller.entrypoint","msg":"setting up manager"} 107 | {"level":"info","ts":1585701003.1179338,"logger":"controller-runtime.metrics","msg":"metrics server is starting to listen","addr":":8080"} 108 | {"level":"info","ts":1585701003.118381,"logger":"k8s-dt-node-labeller.entrypoint","msg":"Setting up controller"} 109 | {"level":"info","ts":1585701003.1185818,"logger":"k8s-dt-node-labeller.entrypoint","msg":"starting manager"} 110 | {"level":"info","ts":1585701003.1190712,"logger":"controller-runtime.manager","msg":"starting metrics server","path":"/metrics"} 111 | {"level":"info","ts":1585701003.1193638,"logger":"controller-runtime.controller","msg":"Starting EventSource","controller":"k8s-dt-node-labeller","source":"kind source: /, Kind="} 112 | {"level":"info","ts":1585701003.2218263,"logger":"controller-runtime.controller","msg":"Starting Controller","controller":"k8s-dt-node-labeller"} 113 | {"level":"info","ts":1585701003.222448,"logger":"controller-runtime.controller","msg":"Starting workers","controller":"k8s-dt-node-labeller","worker count":1} 114 | ... 115 | ``` 116 | 117 | ### Running Node-Local via Docker 118 | 119 | Multi-arch Docker images are available on Docker Hub at [adaptant/k8s-dt-node-labeller]. These may be run as-is 120 | in-cluster, or out of cluster with an appropriate `KUBECONFIG` passed through. 121 | 122 | Note that as the labeller requires access to the host's `/sys/firmware` directory, this must either be passed through 123 | explicitly, or the container run in privileged mode: 124 | 125 | ``` 126 | $ docker run --privileged adaptant/k8s-dt-node-labeller 127 | ... 128 | ``` 129 | 130 | ### Deploying as a Kubernetes DaemonSet 131 | 132 | An example deployment configuration for a DaemonSet is provided in `k8s-dt-labeller-ds.yaml`, which can be directly 133 | applied to the running cluster: 134 | 135 | ``` 136 | $ kubectl apply -f https://raw.githubusercontent.com/adaptant-labs/k8s-dt-node-labeller/k8s-dt-labeller-ds.yaml 137 | ``` 138 | 139 | This will create a special `dt-labeller` service account, cluster role, and binding with the permission to list and 140 | reconcile nodes. Note that as the labeller requires access to an unmasked `/sys/firmware`, it must also be run in a 141 | privileged securityContext. 142 | 143 | ### Deploying with NFD 144 | 145 | When used together with NFD `k8s-dt-node-labeller` runs in one-shot mode as an init container, providing a static list 146 | of discovered features and labels to pass off to NFD, for use with its `local` feature discovery. 147 | 148 | ``` 149 | $ kubectl apply -f https://raw.githubusercontent.com/adaptant-labs/k8s-dt-node-labeller/k8s-dt-labeller-nfd.yaml 150 | ``` 151 | 152 | In this configuration, the `nfd-master`, `nfd-worker`, and `k8s-dt-node-labeller` are all deployed in the same Pod in 153 | order to facilitate node-local labelling. While the `k8s-dt-node-labeller` requires access to an unmasked 154 | `/sys/firmware`, and must, therefore, run in a privileged securityContext, the NFD application containers are able to 155 | run without elevated permissions. 156 | 157 | ### Verifying Labelling 158 | 159 | After the labeller has run, the node labels can be viewed from `kubectl`: 160 | 161 | ``` 162 | $ kubectl describe node jetson-nano 163 | Name: jetson-nano 164 | Roles: 165 | Labels: beta.devicetree.org/nvidia-jetson-nano=1 166 | beta.devicetree.org/nvidia-tegra210=1 167 | beta.kubernetes.io/arch=arm64 168 | beta.kubernetes.io/instance-type=k3s 169 | beta.kubernetes.io/os=linux 170 | k3s.io/hostname=jetson-nano 171 | k3s.io/internal-ip=192.168.xxx.xxx 172 | kubernetes.io/arch=arm64 173 | kubernetes.io/hostname=jetson-nano 174 | kubernetes.io/os=linux 175 | node.kubernetes.io/instance-type=k3s 176 | ... 177 | ``` 178 | 179 | ## Features and bugs 180 | 181 | Please file feature requests and bugs in the [issue tracker][tracker]. 182 | 183 | ## Acknowledgements 184 | 185 | This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant 186 | agreement No 825480 ([SODALITE]). 187 | 188 | ## License 189 | 190 | `k8s-dt-node-labeller` is licensed under the terms of the Apache 2.0 license, the full 191 | version of which can be found in the LICENSE file included in the distribution. 192 | 193 | [tracker]: https://github.com/adaptant-labs/k8s-dt-node-labeller/issues 194 | [devicetree]: https://www.devicetree.org 195 | [SODALITE]: https://www.sodalite.eu 196 | [overview]: https://raw.githubusercontent.com/adaptant-labs/k8s-dt-node-labeller/master/overview.png 197 | [amdgpu-node-labeller]: https://github.com/RadeonOpenCompute/k8s-device-plugin/tree/master/cmd/k8s-node-labeller 198 | [adaptant/k8s-dt-node-labeller]: https://hub.docker.com/repository/docker/adaptant/k8s-dt-node-labeller 199 | [node-feature-discovery]: https://github.com/kubernetes-sigs/node-feature-discovery -------------------------------------------------------------------------------- /controller.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "context" 5 | 6 | "github.com/go-logr/logr" 7 | 8 | corev1 "k8s.io/api/core/v1" 9 | "k8s.io/apimachinery/pkg/api/errors" 10 | "sigs.k8s.io/controller-runtime/pkg/client" 11 | "sigs.k8s.io/controller-runtime/pkg/reconcile" 12 | ) 13 | 14 | type reconcileNodeLabels struct { 15 | client client.Client 16 | log logr.Logger 17 | labels map[string]string 18 | } 19 | 20 | // make sure reconcileNodeLabels implement the Reconciler interface 21 | var _ reconcile.Reconciler = &reconcileNodeLabels{} 22 | 23 | func (r *reconcileNodeLabels) Reconcile(request reconcile.Request) (reconcile.Result, error) { 24 | // set up a convenient log object so we don't have to type request over and over again 25 | log := r.log.WithValues("request", request) 26 | 27 | node := &corev1.Node{} 28 | err := r.client.Get(context.TODO(), request.NamespacedName, node) 29 | if errors.IsNotFound(err) { 30 | log.Error(nil, "Could not find Node") 31 | return reconcile.Result{}, nil 32 | } 33 | 34 | if err != nil { 35 | log.Error(err, "Could not fetch Node") 36 | return reconcile.Result{}, err 37 | } 38 | 39 | // Set the label 40 | if node.Labels == nil { 41 | node.Labels = map[string]string{} 42 | } 43 | 44 | // Remove old labels 45 | for k := range node.Labels { 46 | if matchesLabelPrefix(k) { 47 | delete(node.Labels, k) 48 | } 49 | } 50 | 51 | for k, v := range r.labels { 52 | node.Labels[k] = v 53 | } 54 | 55 | err = r.client.Update(context.TODO(), node) 56 | if err != nil { 57 | log.Error(err, "Could not write Node") 58 | return reconcile.Result{}, err 59 | } 60 | 61 | return reconcile.Result{}, nil 62 | } 63 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module k8s-dt-node-labeller 2 | 3 | go 1.13 4 | 5 | replace github.com/platinasystems/fdt => github.com/adaptant-labs/fdt v1.0.2-0.20200521120921-a1cf022f5f28 6 | 7 | require ( 8 | github.com/go-logr/logr v0.1.0 9 | github.com/platinasystems/fdt v1.0.1 10 | k8s.io/api v0.17.2 11 | k8s.io/apimachinery v0.17.2 12 | sigs.k8s.io/controller-runtime v0.5.2 13 | ) 14 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 3 | cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= 4 | github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8= 5 | github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI= 6 | github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0= 7 | github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA= 8 | github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0= 9 | github.com/Azure/go-autorest/autorest/mocks v0.2.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0= 10 | github.com/Azure/go-autorest/logger v0.1.0/go.mod h1:oExouG+K6PryycPJfVSxi/koC6LSNgds39diKLz7Vrc= 11 | github.com/Azure/go-autorest/tracing v0.5.0/go.mod h1:r/s2XiOKccPW3HrqB+W0TQzfbtp2fGCgRFtBroKn4Dk= 12 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 13 | github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo= 14 | github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ= 15 | github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0= 16 | github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0= 17 | github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0= 18 | github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE= 19 | github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE= 20 | github.com/adaptant-labs/fdt v1.0.1 h1:foxyMdSeSUnhD9GCWrFyLImxvEUShOvKVnhdsUTfceA= 21 | github.com/adaptant-labs/fdt v1.0.1/go.mod h1:WSVWH9RpIVY1dEmMk2u6ewQceD2bfFdLVN68cSixbnY= 22 | github.com/adaptant-labs/fdt v1.0.2-0.20200521120921-a1cf022f5f28 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modernc.org/cc v1.0.0/go.mod h1:1Sk4//wdnYJiUIxnW8ddKpaOJCF37yAdqYnkxUpaYxw= 447 | modernc.org/golex v1.0.0/go.mod h1:b/QX9oBD/LhixY6NDh+IdGv17hgB+51fET1i2kPSmvk= 448 | modernc.org/mathutil v1.0.0/go.mod h1:wU0vUrJsVWBZ4P6e7xtFJEhFSNsfRLJ8H458uRjg03k= 449 | modernc.org/strutil v1.0.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs= 450 | modernc.org/xc v1.0.0/go.mod h1:mRNCo0bvLjGhHO9WsyuKVU4q0ceiDDDoEeWDJHrNx8I= 451 | sigs.k8s.io/controller-runtime v0.5.2 h1:pyXbUfoTo+HA3jeIfr0vgi+1WtmNh0CwlcnQGLXwsSw= 452 | sigs.k8s.io/controller-runtime v0.5.2/go.mod h1:JZUwSMVbxDupo0lTJSSFP5pimEyxGynROImSsqIOx1A= 453 | sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI= 454 | sigs.k8s.io/structured-merge-diff v1.0.1-0.20191108220359-b1b620dd3f06 h1:zD2IemQ4LmOcAumeiyDWXKUI2SO0NYDe3H6QGvPOVgU= 455 | sigs.k8s.io/structured-merge-diff v1.0.1-0.20191108220359-b1b620dd3f06/go.mod h1:/ULNhyfzRopfcjskuui0cTITekDduZ7ycKN3oUT9R18= 456 | sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs= 457 | sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= 458 | -------------------------------------------------------------------------------- /k8s-dt-labeller-ds.yaml: -------------------------------------------------------------------------------- 1 | kind: ServiceAccount 2 | apiVersion: v1 3 | metadata: 4 | name: dt-labeller 5 | namespace: kube-system 6 | labels: 7 | addonmanager.kubernetes.io/mode: Reconcile 8 | --- 9 | kind: ClusterRole 10 | apiVersion: rbac.authorization.k8s.io/v1 11 | metadata: 12 | name: system:dt-labeller 13 | labels: 14 | addonmanager.kubernetes.io/mode: Reconcile 15 | rules: 16 | - apiGroups: [""] 17 | resources: ["nodes"] 18 | verbs: ["list", "get", "patch", "update", "watch"] 19 | --- 20 | kind: ClusterRoleBinding 21 | apiVersion: rbac.authorization.k8s.io/v1 22 | metadata: 23 | name: system:dt-labeller 24 | labels: 25 | addonmanager.kubernetes.io/mode: Reconcile 26 | subjects: 27 | - kind: ServiceAccount 28 | name: dt-labeller 29 | namespace: kube-system 30 | roleRef: 31 | kind: ClusterRole 32 | name: system:dt-labeller 33 | apiGroup: rbac.authorization.k8s.io 34 | --- 35 | apiVersion: apps/v1 36 | kind: DaemonSet 37 | metadata: 38 | name: dt-labeller 39 | namespace: kube-system 40 | spec: 41 | selector: 42 | matchLabels: 43 | name: dt-labeller 44 | template: 45 | metadata: 46 | labels: 47 | name: dt-labeller 48 | spec: 49 | # Restrict to devicetree-capable nodes 50 | nodeSelector: 51 | kubernetes.io/arch: arm64 52 | containers: 53 | - env: 54 | - name: NODE_NAME 55 | valueFrom: 56 | fieldRef: 57 | fieldPath: spec.nodeName 58 | image: adaptant/k8s-dt-node-labeller:latest 59 | name: dt-labeller 60 | securityContext: 61 | # Needed for /sys/firmware access 62 | privileged: true 63 | serviceAccountName: dt-labeller 64 | -------------------------------------------------------------------------------- /k8s-dt-labeller-nfd.yaml: -------------------------------------------------------------------------------- 1 | # This template contains an example of running k8s-dt-node-labeller, nfd-master, and nfd-worker in the 2 | # same pod. 3 | apiVersion: v1 4 | kind: Namespace 5 | metadata: 6 | name: node-feature-discovery # NFD namespace 7 | --- 8 | apiVersion: v1 9 | kind: ServiceAccount 10 | metadata: 11 | name: nfd-master 12 | namespace: node-feature-discovery 13 | --- 14 | apiVersion: rbac.authorization.k8s.io/v1 15 | kind: ClusterRole 16 | metadata: 17 | name: nfd-master 18 | rules: 19 | - apiGroups: 20 | - "" 21 | resources: 22 | - nodes 23 | verbs: 24 | - list 25 | - get 26 | - patch 27 | - update 28 | - watch 29 | --- 30 | apiVersion: rbac.authorization.k8s.io/v1 31 | kind: ClusterRoleBinding 32 | metadata: 33 | name: nfd-master 34 | roleRef: 35 | apiGroup: rbac.authorization.k8s.io 36 | kind: ClusterRole 37 | name: nfd-master 38 | subjects: 39 | - kind: ServiceAccount 40 | name: nfd-master 41 | namespace: node-feature-discovery 42 | --- 43 | apiVersion: apps/v1 44 | kind: DaemonSet 45 | metadata: 46 | labels: 47 | app: nfd 48 | name: nfd 49 | namespace: node-feature-discovery 50 | spec: 51 | selector: 52 | matchLabels: 53 | app: nfd 54 | template: 55 | metadata: 56 | labels: 57 | app: nfd 58 | spec: 59 | serviceAccount: nfd-master 60 | hostNetwork: true 61 | # Restrict to devicetree-capable nodes 62 | nodeSelector: 63 | kubernetes.io/arch: arm64 64 | initContainers: 65 | - env: 66 | - name: NODE_NAME 67 | valueFrom: 68 | fieldRef: 69 | fieldPath: spec.nodeName 70 | image: adaptant/k8s-dt-node-labeller:latest 71 | name: dt-labeller 72 | args: 73 | - "-f" 74 | securityContext: 75 | # Needed for /sys/firmware access 76 | privileged: true 77 | volumeMounts: 78 | - name: features-d 79 | mountPath: /etc/kubernetes/node-feature-discovery/features.d 80 | containers: 81 | - env: 82 | - name: NODE_NAME 83 | valueFrom: 84 | fieldRef: 85 | fieldPath: spec.nodeName 86 | image: adaptant/node-feature-discovery:latest 87 | name: nfd-master 88 | command: 89 | - "nfd-master" 90 | args: 91 | - "--extra-label-ns=beta.devicetree.org,devicetree.org" 92 | - env: 93 | - name: NODE_NAME 94 | valueFrom: 95 | fieldRef: 96 | fieldPath: spec.nodeName 97 | image: adaptant/node-feature-discovery:latest 98 | name: nfd-worker 99 | command: 100 | - "nfd-worker" 101 | args: 102 | - "--sleep-interval=60s" 103 | volumeMounts: 104 | - name: host-boot 105 | mountPath: "/host-boot" 106 | readOnly: true 107 | - name: host-os-release 108 | mountPath: "/host-etc/os-release" 109 | readOnly: true 110 | - name: host-sys 111 | mountPath: "/host-sys" 112 | - name: source-d 113 | mountPath: "/etc/kubernetes/node-feature-discovery/source.d/" 114 | - name: features-d 115 | mountPath: "/etc/kubernetes/node-feature-discovery/features.d/" 116 | volumes: 117 | - name: host-boot 118 | hostPath: 119 | path: "/boot" 120 | - name: host-os-release 121 | hostPath: 122 | path: "/etc/os-release" 123 | - name: host-sys 124 | hostPath: 125 | path: "/sys" 126 | - name: source-d 127 | hostPath: 128 | path: "/etc/kubernetes/node-feature-discovery/source.d/" 129 | - name: features-d 130 | hostPath: 131 | path: "/etc/kubernetes/node-feature-discovery/features.d/" 132 | -------------------------------------------------------------------------------- /labels.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "strings" 6 | ) 7 | 8 | var ( 9 | labelNamespace = "devicetree.org" 10 | ) 11 | 12 | func createLabelPrefix(name string, experimental bool) string { 13 | var s string 14 | 15 | if experimental { 16 | s = "beta." 17 | } else { 18 | s = "" 19 | } 20 | 21 | return fmt.Sprintf("%s%s/%s", s, labelNamespace, name) 22 | } 23 | 24 | func matchesLabelPrefix(s string) bool { 25 | return strings.HasPrefix(s, "beta." + labelNamespace) || strings.HasPrefix(s, labelNamespace) 26 | } -------------------------------------------------------------------------------- /labels_test.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "testing" 6 | ) 7 | 8 | func TestLabelPrefix(t *testing.T) { 9 | devName := "xilinx-zynq-7000" 10 | labelPrefix := "beta.devicetree.org" 11 | expected := fmt.Sprintf("%s/%s", labelPrefix, devName) 12 | s := createLabelPrefix(devName, true) 13 | if s != expected { 14 | t.Errorf("Label incorrect, got \"%s\", expected: \"%s\"", s, expected) 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "flag" 5 | "fmt" 6 | "github.com/platinasystems/fdt" 7 | corev1 "k8s.io/api/core/v1" 8 | "os" 9 | "sigs.k8s.io/controller-runtime/pkg/client/config" 10 | "sigs.k8s.io/controller-runtime/pkg/controller" 11 | "sigs.k8s.io/controller-runtime/pkg/event" 12 | "sigs.k8s.io/controller-runtime/pkg/handler" 13 | logf "sigs.k8s.io/controller-runtime/pkg/log" 14 | "sigs.k8s.io/controller-runtime/pkg/log/zap" 15 | "sigs.k8s.io/controller-runtime/pkg/manager" 16 | "sigs.k8s.io/controller-runtime/pkg/predicate" 17 | "sigs.k8s.io/controller-runtime/pkg/runtime/signals" 18 | "sigs.k8s.io/controller-runtime/pkg/source" 19 | "strconv" 20 | "strings" 21 | ) 22 | 23 | type CompatInfo map[string]int 24 | 25 | var ( 26 | compatMap = make(CompatInfo) 27 | log = logf.Log.WithName("k8s-dt-node-labeller") 28 | defaultNodes = []string{"cpu", "gpu" } 29 | featureFilesDir = "/etc/kubernetes/node-feature-discovery/features.d/" 30 | nfdFeaturesFile = "devicetree-features" 31 | vendorNormalizationMap = map[string]string{ 32 | "xlnx": "xilinx", 33 | } 34 | ) 35 | 36 | // Convert the compatMap to the label format expected by the K8s Reconciler API 37 | func generateLabels(experimental bool) map[string]string { 38 | m := make(map[string]string) 39 | for k, v := range compatMap { 40 | m[createLabelPrefix(k, experimental)] = strconv.Itoa(v) 41 | } 42 | 43 | return m 44 | } 45 | 46 | func vendorNormalize(vendorName string) string { 47 | if normalized, ok := vendorNormalizationMap[vendorName]; ok { 48 | return normalized 49 | } 50 | 51 | return vendorName 52 | } 53 | 54 | // Normalize 'manufacturer,model' property names to 'manufacturer-model' 55 | func propertyNormalize(property string) string { 56 | s := strings.Split(property, ",") 57 | 58 | // If there is no matching separator, return the property as-is 59 | if len(s) == 1 { 60 | return property 61 | } 62 | 63 | return fmt.Sprintf("%s-%s", vendorNormalize(s[0]), s[1]) 64 | } 65 | 66 | func getCompatStrings(n *fdt.Node) []string { 67 | s := strings.Split(string(n.Properties["compatible"]), "\x00") 68 | s = s[:len(s)-1] 69 | return s 70 | } 71 | 72 | func walkNode(n *fdt.Node) { 73 | compatStrings := getCompatStrings(n) 74 | for _, v := range compatStrings { 75 | compatMap[propertyNormalize(v)] += 1 76 | } 77 | } 78 | 79 | func parseDeviceTree(nodeNames []string) error { 80 | if _, err := os.Stat("/proc/device-tree"); err != nil { 81 | return fmt.Errorf("no valid device tree configuration found") 82 | } 83 | 84 | t := fdt.DefaultTree() 85 | if t == nil { 86 | return fmt.Errorf("failed to parse device tree") 87 | } 88 | 89 | for _, node := range nodeNames { 90 | // Match nodes with an exact name match 91 | t.MatchNode(node, walkNode) 92 | 93 | // Detect node names matching either of the following formats: 94 | // name@
95 | // name@
96 | regex := fmt.Sprintf("^(%s)([0-9]+|)@.*$", node) 97 | t.EachNodeMatching(regex, walkNode) 98 | } 99 | 100 | return nil 101 | } 102 | 103 | func (ci CompatInfo) writeNfdFeatures() error { 104 | // Create the directory if it doesn't exist 105 | err := os.MkdirAll(featureFilesDir, os.ModePerm) 106 | if err != nil { 107 | return err 108 | } 109 | 110 | // Create the features file 111 | featuresFilePath := featureFilesDir + nfdFeaturesFile 112 | features, err := os.Create(featuresFilePath) 113 | if err != nil { 114 | return err 115 | } 116 | defer features.Close() 117 | 118 | fmt.Printf("Writing out discovered features to %s\n", featuresFilePath) 119 | 120 | // Write out each feature 121 | for k, v := range compatMap { 122 | label := fmt.Sprintf("%s=%d\n", createLabelPrefix(k, true), v) 123 | _, err := features.WriteString(label) 124 | if err != nil { 125 | return err 126 | } 127 | } 128 | 129 | features.Sync() 130 | return nil 131 | } 132 | 133 | func (ci CompatInfo) dumpFeatures() { 134 | fmt.Printf("Discovered the following devicetree properties:\n\n") 135 | 136 | // Iterate over the parsed map 137 | for k, v := range compatMap { 138 | fmt.Printf("%s: %d\n", createLabelPrefix(k, true), v) 139 | } 140 | } 141 | 142 | func appendNodeIfNotExist(nodes []string, name string) []string { 143 | for _, node := range nodes { 144 | if node == name { 145 | return nodes 146 | } 147 | } 148 | 149 | return append(nodes, name) 150 | } 151 | 152 | func appendNodesIfNotExist(nodes[] string, names ...string) []string { 153 | for _, name := range names { 154 | nodes = appendNodeIfNotExist(nodes, name) 155 | } 156 | 157 | return nodes 158 | } 159 | 160 | func getNodeName() (string, error) { 161 | // Within the Kubernetes Pod, the hostname provides the Pod name, rather than the node name, so we pass in the 162 | // node name via the NODE_NAME environment variable instead. 163 | nodeName := os.Getenv("NODE_NAME") 164 | if len(nodeName) > 0 { 165 | return nodeName, nil 166 | } 167 | 168 | // If the NODE_NAME environment variable is unset, fall back on hostname matching (e.g. when running outside of 169 | // a Kubernetes deployment). 170 | return os.Hostname() 171 | } 172 | 173 | func main() { 174 | var n string 175 | var d bool 176 | var nfd bool 177 | 178 | flag.BoolVar(&d, "d", false, "Display detected devicetree nodes") 179 | flag.BoolVar(&nfd, "f", false, "Write detected features to NFD features file") 180 | flag.StringVar(&n, "n", "", "Additional devicetree node names") 181 | 182 | flag.Usage = func() { 183 | fmt.Fprintf(os.Stderr, "devicetree Node Labeller for Kubernetes\n") 184 | fmt.Fprintf(os.Stderr, "Usage: k8s-dt-node-labeller [flags] [-n devicetree nodes...]\n\n") 185 | flag.PrintDefaults() 186 | } 187 | 188 | flag.Parse() 189 | tail := flag.Args() 190 | 191 | // By default check for top-of-tree compatible strings 192 | nodeNames := []string{"/"} 193 | 194 | // And any specified default nodes 195 | nodeNames = append(nodeNames, defaultNodes...) 196 | 197 | // Include any additional node names specified 198 | if len(n) > 0 { 199 | nodeNames = appendNodeIfNotExist(nodeNames, n) 200 | 201 | if len(tail) > 0 { 202 | nodeNames = appendNodesIfNotExist(nodeNames, tail...) 203 | } 204 | } else { 205 | // Check for any invalid or unhandled args 206 | if len(tail) > 0 { 207 | flag.Usage() 208 | os.Exit(1) 209 | } 210 | } 211 | 212 | err := parseDeviceTree(nodeNames) 213 | if err != nil { 214 | panic(err) 215 | } 216 | 217 | if d { 218 | compatMap.dumpFeatures() 219 | os.Exit(0) 220 | } 221 | 222 | if nfd { 223 | err = compatMap.writeNfdFeatures() 224 | if err != nil { 225 | fmt.Printf("Failed to write feature labels: %s\n", err.Error()) 226 | os.Exit(1) 227 | } 228 | 229 | os.Exit(0) 230 | } 231 | 232 | logf.SetLogger(zap.New(zap.UseDevMode(false))) 233 | entryLog := log.WithName("entrypoint") 234 | 235 | // Setup a Manager 236 | entryLog.Info("setting up manager") 237 | mgr, err := manager.New(config.GetConfigOrDie(), manager.Options{}) 238 | if err != nil { 239 | entryLog.Error(err, "unable to set up overall controller manager") 240 | os.Exit(1) 241 | } 242 | 243 | // Setup a new controller to Reconcile Node labels 244 | entryLog.Info("Setting up controller") 245 | c, err := controller.New("k8s-dt-node-labeller", mgr, controller.Options{ 246 | Reconciler: &reconcileNodeLabels{client: mgr.GetClient(), 247 | log: log.WithName("reconciler"), 248 | labels: generateLabels(true), 249 | }, 250 | }) 251 | if err != nil { 252 | entryLog.Error(err, "unable to set up individual controller") 253 | os.Exit(1) 254 | } 255 | 256 | // By default, only run node-local. This is achieved by matching the 257 | // hostname of the system we are running on against the hostname 258 | // tagged as part of the node's metadata. 259 | pred := predicate.Funcs{ 260 | CreateFunc: func(e event.CreateEvent) bool { 261 | hostname, err := getNodeName() 262 | if err != nil { 263 | return false 264 | } 265 | return hostname == e.Meta.GetName() 266 | }, 267 | DeleteFunc: func(e event.DeleteEvent) bool { 268 | return false 269 | }, 270 | UpdateFunc: func(e event.UpdateEvent) bool { 271 | return false 272 | }, 273 | GenericFunc: func(e event.GenericEvent) bool { 274 | return false 275 | }, 276 | } 277 | 278 | // Watch Nodes and enqueue Nodes object key 279 | if err := c.Watch(&source.Kind{Type: &corev1.Node{}}, &handler.EnqueueRequestForObject{}, &pred); err != nil { 280 | entryLog.Error(err, "unable to watch Node") 281 | os.Exit(1) 282 | } 283 | 284 | entryLog.Info("starting manager") 285 | if err := mgr.Start(signals.SetupSignalHandler()); err != nil { 286 | entryLog.Error(err, "unable to run manager") 287 | os.Exit(1) 288 | } 289 | } 290 | -------------------------------------------------------------------------------- /main_test.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import "testing" 4 | 5 | func TestPropertyNormalize(t *testing.T) { 6 | p := "xlnx,zynq-7000" 7 | e := "xilinx-zynq-7000" 8 | n := propertyNormalize(p) 9 | 10 | if n != "xilinx-zynq-7000" { 11 | t.Errorf("Property value incorrect, got \"%s\", expected: \"%s\"", n, e) 12 | } 13 | } 14 | -------------------------------------------------------------------------------- /overview.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/adaptant-labs/k8s-dt-node-labeller/11a28e6b1dde16ba1f3551cb086a0270bdaeba58/overview.png --------------------------------------------------------------------------------