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71 lines
2.5 KiB
Markdown
71 lines
2.5 KiB
Markdown
# Intel FPGA prestart CRI-O webhook for Kubernetes
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Table of Contents
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* [Introduction](#introduction)
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* [Dependencies](#dependencies)
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* [Building](#building)
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* [Getting the source code](#getting-the-source-code)
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* [Building the image](#building-the-image)
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* [Configuring CRI-O](#configuring-cri-o)
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## Introduction
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The FPGA CRI-O webhook is one of the components used to add support for Intel FPGA
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devices to Kubernetes.
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The FPGA prestart CRI-O hook is triggered by container annotations, such as set by the
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[FPGA device plugin](../fpga_plugin/README.md). It performs discovery of the requested FPGA
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function bitstream and then programs FPGA devices based on the environment variables
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in the workload description.
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The CRI-O prestart hook is only *required* when the
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[FPGA admission webhook](../fpga_admissionwebhook/README.md) is configured for orchestration
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programmed mode, and is benign (un-used) otherwise.
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> **Note:** The fpga CRI-O webhook is usually installed by the same DaemonSet as the
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> FPGA device plugin. If building and installing the CRI-O webhook by hand, it is
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> recommended you reference the
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> [fpga plugin DaemonSet YAML](/deployments/fpga_plugin/base/intel-fpga-plugin-daemonset.yaml ) for
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> more details.
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## Dependencies
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This component is one of a set of components that work together. You may also want to
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install the following:
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- [FPGA device plugin](../fpga_plugin/README.md)
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- [FPGA admission controller](../fpga_admissionwebhook/README.md)
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All components have the same basic dependencies as the
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[generic plugin framework dependencies](../../README.md#about)
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## Building
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The following sections detail how to obtain, build and deploy the CRI-O
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prestart hook.
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### Getting the source code
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```bash
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$ export INTEL_DEVICE_PLUGINS_SRC=/path/to/intel-device-plugins-for-kubernetes
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$ git clone https://github.com/intel/intel-device-plugins-for-kubernetes ${INTEL_DEVICE_PLUGINS_SRC}
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```
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### Building the image
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```bash
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$ cd ${INTEL_DEVICE_PLUGINS_SRC}
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$ make intel-fpga-initcontainer
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...
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Successfully tagged intel/intel-fpga-initcontainer:devel
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```
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## Configuring CRI-O
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Recent versions of [CRI-O](https://github.com/cri-o/cri-o) are shipped with default configuration
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file that prevents CRI-O to discover and configure hooks automatically.
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For FPGA orchestration programmed mode, the OCI hooks are the key component.
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Please ensure that your `/etc/crio/crio.conf` parameter `hooks_dir` is either unset
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(to enable default search paths for OCI hooks configuration) or contains the directory
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`/etc/containers/oci/hooks.d`. |