mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-14 11:57:51 +00:00
6515990cae
Bump the required Kubernetes version to v1.24. In practice this is the minimum Kubernetes version as our deployment (both kustomize and Helm) depend on the gRPC container probes feature of Kubernetes.
316 lines
12 KiB
Markdown
316 lines
12 KiB
Markdown
---
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title: "Developer guide"
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layout: default
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sort: 5
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---
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# Developer guide
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{: .no_toc}
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## Table of contents
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{: .no_toc .text-delta}
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1. TOC
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{:toc}
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---
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## Building from source
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### Download the source code
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```bash
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git clone https://github.com/kubernetes-sigs/node-feature-discovery
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cd node-feature-discovery
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```
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### Docker build
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#### Build the container image
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See [customizing the build](#customizing-the-build) below for altering the
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container image registry, for example.
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```bash
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make
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```
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#### Push the container image
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Optional, this example with Docker.
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```bash
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docker push <IMAGE_TAG>
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```
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### Docker multi-arch builds with buildx
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The default set of architectures enabled for mulit-arch builds are `linux/amd64`
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and `linux/arm64`. If more architectures are needed one can override the
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`IMAGE_ALL_PLATFORMS` variable with a comma separated list of `OS/ARCH` tuples.
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#### Build the manifest-list with a container image per arch
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```bash
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make image-all
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```
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Currently `docker` does not support loading of manifest-lists meaning the images
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are not shown when executing `docker images`, see:
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[buildx issue #59](https://github.com/docker/buildx/issues/59).
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#### Push the manifest-list with container image per arch
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```bash
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make push-all
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```
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The resulting container image can be used in the same way on each arch by pulling
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e.g. `node-feature-discovery:{{ site.release }}` without specifying the
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architecture. The manifest-list will take care of providing the right
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architecture image.
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#### Change the job spec to use your custom image (optional)
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To use your published image from the step above instead of the
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`registry.k8s.io/nfd/node-feature-discovery` image, edit `image`
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attribute in the spec template(s) to the new location
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(`<registry-name>/<image-name>[:<version>]`).
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### Deployment
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The `yamls` makefile generates a `kustomization.yaml` matching your locally
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built image and using the `deploy/overlays/default` deployment. See
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[build customization](#customizing-the-build) below for configurability, e.g.
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changing the deployment namespace.
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```bash
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K8S_NAMESPACE=my-ns make yamls
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kubectl apply -k .
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```
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You can use alternative deployment methods by modifying the auto-generated
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kustomization file.
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### Building locally
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You can also build the binaries locally
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```bash
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make build
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```
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This will compile binaries under `bin/`
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### Customizing the build
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There are several Makefile variables that control the build process and the
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name of the resulting container image. The following are targeted targeted for
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build customization and they can be specified via environment variables or
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makefile overrides.
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| Variable | Description | Default value |
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| -------------------------- | ----------------------------------------------------------------- | ------------- |
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| HOSTMOUNT_PREFIX | Prefix of system directories for feature discovery (local builds) | / (*local builds*) /host- (*container builds*) |
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| IMAGE_BUILD_CMD | Command to build the image | docker build |
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| IMAGE_BUILD_EXTRA_OPTS | Extra options to pass to build command | *empty* |
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| IMAGE_BUILDX_CMD | Command to build and push multi-arch images with buildx | DOCKER_CLI_EXPERIMENTAL=enabled docker buildx build --platform=${IMAGE_ALL_PLATFORMS} --progress=auto --pull |
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| IMAGE_ALL_PLATFORMS | Comma separated list of OS/ARCH tuples for mulit-arch builds | linux/amd64,linux/arm64 |
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| IMAGE_PUSH_CMD | Command to push the image to remote registry | docker push |
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| IMAGE_REGISTRY | Container image registry to use | registry.k8s.io/nfd |
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| IMAGE_TAG_NAME | Container image tag name | <nfd version> |
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| IMAGE_EXTRA_TAG_NAMES | Additional container image tag(s) to create when building image | *empty* |
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| K8S_NAMESPACE | nfd-master and nfd-worker namespace | node-feature-discovery |
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For example, to use a custom registry:
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```bash
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make IMAGE_REGISTRY=<my custom registry uri>
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```
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Or to specify a build tool different from Docker, It can be done in 2 ways:
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1. via environment
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```bash
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IMAGE_BUILD_CMD="buildah bud" make
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```
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1. by overriding the variable value
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```bash
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make IMAGE_BUILD_CMD="buildah bud"
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```
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### Testing
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Unit tests are automatically run as part of the container image build. You can
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also run them manually in the source code tree by running:
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```bash
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make test
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```
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End-to-end tests are built on top of the e2e test framework of Kubernetes, and,
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they required a cluster to run them on. For running the tests on your test
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cluster you need to specify the kubeconfig to be used:
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```bash
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make e2e-test KUBECONFIG=$HOME/.kube/config
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```
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There are several environment variables that can be used to customize the
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e2e-tests:
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| Variable | Description | Default value |
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| -------------------------- | ----------------------------------------------------------------- | ------------- |
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| KUBECONFIG | Kubeconfig for running e2e-tests | *empty* |
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| E2E_TEST_CONFIG | Parameterization file of e2e-tests (see [example][e2e-config-sample]) | *empty* |
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| E2E_PULL_IF_NOT_PRESENT | True-ish value makes the image pull policy IfNotPresent (to be used only in e2e tests) | false |
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| E2E_TEST_FULL_IMAGE | Run e2e-test also against the Full Image tag | false |
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| E2E_GINKGO_LABEL_FILTER | Ginkgo label filter to use for running e2e tests | *empty* |
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| OPENSHIFT | Non-empty value enables OpenShift specific support (only affects e2e tests) | *empty* |
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## Running locally
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> ****DEPRECATED**: Running NFD locally is deprecated and will be removed in a
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> future release. It depends on the gRPC API which is deprecated and will be
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> removed in a future release. To run NFD locally, disable the NodeFeature API
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> with `-feature-gates NodeFeatureAPI=false` flag.
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You can run NFD locally, either directly on your host OS or in containers for
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testing and development purposes. This may be useful e.g. for checking
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features-detection.
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### NFD-Master
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When running as a standalone container labeling is expected to fail because
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Kubernetes API is not available. Thus, it is recommended to use `-no-publish`
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Also specify `-crd-controller=false` and `-feature-gates NodeFeatureAPI=false`
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command line flags to disable CRD controller and enable gRPC. E.g.
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```bash
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$ export NFD_CONTAINER_IMAGE={{ site.container_image }}
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$ docker run --rm --name=nfd-test ${NFD_CONTAINER_IMAGE} nfd-master -no-publish -crd-controller=false -feature-gates NodeFeatureAPI=false
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2019/02/01 14:48:21 Node Feature Discovery Master <NFD_VERSION>
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2019/02/01 14:48:21 gRPC server serving on port: 8080
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```
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### NFD-Worker
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To run nfd-worker as a "stand-alone" container you need to run it in the same
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network namespace as the nfd-master container:
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```bash
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$ docker run --rm --network=container:nfd-test ${NFD_CONTAINER_IMAGE} nfd-worker -feature-gates NodeFeatureAPI=false
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2019/02/01 14:48:56 Node Feature Discovery Worker <NFD_VERSION>
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...
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```
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If you just want to try out feature discovery without connecting to nfd-master,
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pass the `-no-publish` flag to nfd-worker.
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> **NOTE:** Some feature sources need certain directories and/or files from the
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> host mounted inside the NFD container. Thus, you need to provide Docker with
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> the correct `--volume` options for them to work correctly when run
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> stand-alone directly with `docker run`. See
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> the [default deployment](https://github.com/kubernetes-sigs/node-feature-discovery/blob/{{site.release}}/deployment/components/common/worker-mounts.yaml)
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> for up-to-date information about the required volume mounts.
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### NFD-Topology-Updater
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To run nfd-topology-updater as a "stand-alone" container
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you need to run it in with the `-no-publish` flag to disable communication to
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the Kubernetes apiserver.
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```bash
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$ docker run --rm ${NFD_CONTAINER_IMAGE} nfd-topology-updater -no-publish
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2019/02/01 14:48:56 Node Feature Discovery Topology Updater <NFD_VERSION>
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...
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```
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If you just want to try out resource topology discovery without connecting to
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the Kubernetes API, pass the `-no-publish` flag to nfd-topology-updater.
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> **NOTE:** NFD topology updater needs certain directories and/or files from
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> the host mounted inside the NFD container. Thus, you need to provide Docker
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> with the correct `--volume` options for them to work correctly when
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> run stand-alone directly with `docker run`. See
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> the [template spec](https://github.com/kubernetes-sigs/node-feature-discovery/blob/{{site.release}}/deployment/components/topology-updater/topologyupdater-mounts.yaml)
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> for up-to-date information about the required volume mounts.
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## Running with Tilt
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Another option for building NFD locally is via Tilt tool, which can build container
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images, push them to a local registry and reload your Kubernetes pods automatically.
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When using Tilt, you don't have to build container images and re-deploy your pods
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manually but instead let the Tilt take care of it. Tiltfile is a configuration file
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for the Tilt and is located at the root directory. To develop NFD with Tilt, follow
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the steps below.
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### Prerequisites
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1. Install [Docker](https://docs.docker.com/engine/install/)
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1. Setup Docker as a non-root user.
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1. Install [kubectl](https://kubernetes.io/docs/tasks/tools/)
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1. Install [kustomize](https://github.com/kubernetes-sigs/kustomize)
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1. Install [tilt](https://docs.tilt.dev/install.html)
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1. Create a local Kubernetes cluster
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To start up your Tilt development environment, run
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```shell
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tilt up
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```
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at the root of your local NFD codebase. Tilt will start a web interface in the
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localhost and port 10350. From the web interface, you are able to see how NFD worker
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and master are progressing, watch their build and runtime logs. Once your code changes
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are saved locally, Tilt will notice it and re-build the container image from the
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current code, push the image to the registry and re-deploy NFD pods with the latest
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container image.
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### Environment variables
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To override environment variables used in the Tiltfile during image build,
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export them in your current terminal before starting Tilt.
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```shell
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export IMAGE_TAG_NAME="v1"
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tilt up
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```
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This will override the default value(`master`) of `IMAGE_TAG_NAME` variable defined
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in the Tiltfile.
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## Documentation
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All documentation resides under the
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[docs](https://github.com/kubernetes-sigs/node-feature-discovery/tree/{{site.release}}/docs)
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directory in the source tree. It is designed to be served as a html site by
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[GitHub Pages](https://pages.github.com/).
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Building the documentation is containerized to fix the build
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environment. The recommended way for developing documentation is to run:
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```bash
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make site-serve
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```
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This will build the documentation in a container and serve it under
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[localhost:4000/](http://localhost:4000/) making it easy to verify the results.
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Any changes made to the `docs/` will automatically re-trigger a rebuild and are
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reflected in the served content and can be inspected with a browser refresh.
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To just build the html documentation run:
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```bash
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make site-build
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```
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This will generate html documentation under `docs/_site/`.
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<!-- Links -->
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[e2e-config-sample]: https://github.com/kubernetes-sigs/node-feature-discovery/blob/{{site.release}}/test/e2e/e2e-test-config.exapmle.yaml
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[podresource-api]: https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#monitoring-device-plugin-resources
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[feature-gate]: https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates
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