Merge pull request #44472 from qlijin/2022-12-19-devicemanager-ga.md
[zh-cn] sync 2022-12-19-devicemanager-ga.mdpull/44503/head
Kubernetes Prow Robot
GitHub
commit
72b70b257f
File diff suppressed because one or more lines are too long
|
After Width: | Height: | Size: 25 KiB |
|
|
@ -0,0 +1,211 @@
|
||||||
|
---
|
||||||
|
layout: blog
|
||||||
|
title: 'Kubernetes 1.26：设备管理器正式发布'
|
||||||
|
date: 2022-12-19
|
||||||
|
slug: devicemanager-ga
|
||||||
|
---
|
||||||
|
|
||||||
|
<!--
|
||||||
|
layout: blog
|
||||||
|
title: 'Kubernetes 1.26: Device Manager graduates to GA'
|
||||||
|
date: 2022-12-19
|
||||||
|
slug: devicemanager-ga
|
||||||
|
-->
|
||||||
|
|
||||||
|
<!--
|
||||||
|
**Author:** Swati Sehgal (Red Hat)
|
||||||
|
-->
|
||||||
|
**作者**： Swati Sehgal (Red Hat)
|
||||||
|
|
||||||
|
**译者**： Jin Li (UOS)
|
||||||
|
|
||||||
|
<!--
|
||||||
|
The Device Plugin framework was introduced in the Kubernetes v1.8 release as a vendor
|
||||||
|
independent framework to enable discovery, advertisement and allocation of external
|
||||||
|
devices without modifying core Kubernetes. The feature graduated to Beta in v1.10.
|
||||||
|
With the recent release of Kubernetes v1.26, Device Manager is now generally
|
||||||
|
available (GA).
|
||||||
|
-->
|
||||||
|
设备插件框架是在 Kubernetes v1.8 版本中引入的，它是一个与供应商无关的框架，
|
||||||
|
旨在实现对外部设备的发现、公布和分配，而无需修改核心 Kubernetes。
|
||||||
|
该功能在 v1.10 版本中升级为 Beta 版本。随着 Kubernetes v1.26 的最新发布，
|
||||||
|
设备管理器现已正式发布（GA）。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
Within the kubelet, the Device Manager facilitates communication with device plugins
|
||||||
|
using gRPC through Unix sockets. Device Manager and Device plugins both act as gRPC
|
||||||
|
servers and clients by serving and connecting to the exposed gRPC services respectively.
|
||||||
|
Device plugins serve a gRPC service that kubelet connects to for device discovery,
|
||||||
|
advertisement (as extended resources) and allocation. Device Manager connects to
|
||||||
|
the `Registration` gRPC service served by kubelet to register itself with kubelet.
|
||||||
|
-->
|
||||||
|
在 kubelet 中，设备管理器通过 Unix 套接字使用 gRPC 实现与设备插件的通信。
|
||||||
|
设备管理器和设备插件都充当 gRPC 服务器和客户端的角色，分别提供暴露的 gRPC 服务并进行连接。
|
||||||
|
设备插件提供 gRPC 服务，kubelet 连接该服务进行设备的发现、公布（作为扩展资源）和分配。
|
||||||
|
设备管理器连接到 kubelet 提供的 `Registration` gRPC 服务，以向 kubelet 注册自身。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
Please refer to the documentation for an [example](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#example-pod) on how a pod can request a device exposed to the cluster by a device plugin.
|
||||||
|
-->
|
||||||
|
请查阅文档中的[示例](/zh-cn/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#example-pod),
|
||||||
|
了解一个 Pod 如何通过设备插件请求集群中暴露的设备。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
Here are some example implementations of device plugins:
|
||||||
|
- [AMD GPU device plugin](https://github.com/RadeonOpenCompute/k8s-device-plugin)
|
||||||
|
- [Collection of Intel device plugins for Kubernetes](https://github.com/intel/intel-device-plugins-for-kubernetes)
|
||||||
|
- [NVIDIA device plugin for Kubernetes](https://github.com/NVIDIA/k8s-device-plugin)
|
||||||
|
- [SRIOV network device plugin for Kubernetes](https://github.com/k8snetworkplumbingwg/sriov-network-device-plugin)
|
||||||
|
-->
|
||||||
|
以下是设备插件的一些示例实现:
|
||||||
|
- [AMD GPU 设备插件](https://github.com/RadeonOpenCompute/k8s-device-plugin)
|
||||||
|
- [用于 Kubernetes 的 Intel 设备插件集合](https://github.com/intel/intel-device-plugins-for-kubernetes)
|
||||||
|
- [用于 Kubernetes 的 NVIDIA 设备插件](https://github.com/NVIDIA/k8s-device-plugin)
|
||||||
|
- [用于 Kubernetes 的 SRIOV 网络设备插件](https://github.com/k8snetworkplumbingwg/sriov-network-device-plugin)
|
||||||
|
|
||||||
|
<!--
|
||||||
|
## Noteworthy developments since Device Plugin framework introduction
|
||||||
|
-->
|
||||||
|
## 自设备插件框架引入以来的重要进展
|
||||||
|
|
||||||
|
<!--
|
||||||
|
### Kubelet APIs moved to kubelet staging repo
|
||||||
|
External facing `deviceplugin` API packages moved from `k8s.io/kubernetes/pkg/kubelet/apis/`
|
||||||
|
to `k8s.io/kubelet/pkg/apis/` in v1.17. Refer to [Move external facing kubelet apis to staging](https://github.com/kubernetes/kubernetes/pull/83551) for more details on the rationale behind this change.
|
||||||
|
-->
|
||||||
|
### Kubelet APIs 移至 kubelet 暂存库
|
||||||
|
在 v1.17 版本中，面向外部的 `deviceplugin` API 包已从 `k8s.io/kubernetes/pkg/kubelet/apis/`
|
||||||
|
移动到了 `k8s.io/kubelet/pkg/apis/`。有关此变更背后的更多详细信息，
|
||||||
|
请参阅 [Move external facing kubelet apis to staging](https://github.com/kubernetes/kubernetes/pull/83551)
|
||||||
|
|
||||||
|
<!--
|
||||||
|
### Device Plugin API updates
|
||||||
|
-->
|
||||||
|
### 设备插件 API 更新
|
||||||
|
|
||||||
|
<!--
|
||||||
|
Additional gRPC endpoints introduced:
|
||||||
|
1. `GetDevicePluginOptions` is used by device plugins to communicate
|
||||||
|
options to the `DeviceManager` in order to indicate if `PreStartContainer`,
|
||||||
|
`GetPreferredAllocation` or other future optional calls are supported and
|
||||||
|
can be called before making devices available to the container.
|
||||||
|
-->
|
||||||
|
新增了额外的 gRPC 端点：
|
||||||
|
|
||||||
|
1. `GetDevicePluginOptions` 用于设备插件向 `DeviceManager` 传递选项，以指示是否支持
|
||||||
|
`PreStartContainer`、`GetPreferredAllocation` 或其他将来的可选调用，
|
||||||
|
并可在向容器提供设备之前进行调用。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
1. `GetPreferredAllocation` allows a device plugin to forward allocation
|
||||||
|
preferrence to the `DeviceManager` so it can incorporate this information
|
||||||
|
into its allocation decisions. The `DeviceManager` will call out to a
|
||||||
|
plugin at pod admission time asking for a preferred device allocation
|
||||||
|
of a given size from a list of available devices to make a more informed
|
||||||
|
decision. E.g. Specifying inter-device constraints to indicate preferrence
|
||||||
|
on best-connected set of devices when allocating devices to a container.
|
||||||
|
-->
|
||||||
|
2. `GetPreferredAllocation` 允许设备插件将优先分配信息传递给 `DeviceManager`，
|
||||||
|
使其能够将此信息纳入其分配决策中。`DeviceManager` 在 Pod
|
||||||
|
准入时向插件请求指定大小的优选设备分配，以便做出更明智的决策。
|
||||||
|
例如，在为容器分配设备时，指定设备间的约束条件以表明对最佳连接设备集合的偏好。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
1. `PreStartContainer` is called before each container start if indicated by
|
||||||
|
device plugins during registration phase. It allows Device Plugins to run device
|
||||||
|
specific operations on the Devices requested. E.g. reconfiguring or
|
||||||
|
reprogramming FPGAs before the container starts running.
|
||||||
|
-->
|
||||||
|
3. 在注册阶段由设备插件指示时，`PreStartContainer` 会在每次容器启动之前被调用。
|
||||||
|
它允许设备插件在所请求的设备上执行特定的设备操作。
|
||||||
|
例如，在容器启动前对 FPGA 进行重新配置或重新编程。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
Pull Requests that introduced these changes are here:
|
||||||
|
1. [Invoke preStart RPC call before container start, if desired by plugin](https://github.com/kubernetes/kubernetes/pull/58282)
|
||||||
|
1. [Add GetPreferredAllocation() call to the v1beta1 device plugin API](https://github.com/kubernetes/kubernetes/pull/92665)
|
||||||
|
-->
|
||||||
|
引入这些更改的 PR 为：
|
||||||
|
1. [Invoke preStart RPC call before container start, if desired by plugin](https://github.com/kubernetes/kubernetes/pull/58282)
|
||||||
|
1. [Add GetPreferredAllocation() call to the v1beta1 device plugin API](https://github.com/kubernetes/kubernetes/pull/92665)
|
||||||
|
|
||||||
|
<!--
|
||||||
|
With introduction of the above endpoints the interaction between Device Manager in
|
||||||
|
kubelet and Device Manager can be shown as below:
|
||||||
|
-->
|
||||||
|
引入上述端点后，kubelet 中的设备管理器与设备管理器之间的交互如下所示：
|
||||||
|
|
||||||
|
<!--
|
||||||
|
{{< figure src="deviceplugin-framework-overview.svg" alt="Representation of the Device Plugin framework showing the relationship between the kubelet and a device plugin" class="diagram-large" caption="Device Plugin framework Overview" >}}
|
||||||
|
-->
|
||||||
|
{{< figure src="deviceplugin-framework-overview.svg"
|
||||||
|
alt="展示设备插件框架，显示 kubelet 与设备插件之间的关系"
|
||||||
|
class="diagram-large" caption="设备插件框架概述" >}}
|
||||||
|
|
||||||
|
<!--
|
||||||
|
### Change in semantics of device plugin registration process
|
||||||
|
Device plugin code was refactored to separate 'plugin' package under the `devicemanager`
|
||||||
|
package to lay the groundwork for introducing a `v1beta2` device plugin API. This would
|
||||||
|
allow adding support in `devicemanager` to service multiple device plugin APIs at the
|
||||||
|
same time.
|
||||||
|
-->
|
||||||
|
### 设备插件注册流程的语义变更
|
||||||
|
设备插件的代码经过重构，将 'plugin' 包独立于 `devicemanager` 包之外，
|
||||||
|
为引入 `v1beta2` 设备插件 API 做好了前期准备。
|
||||||
|
这将允许在 `devicemanager` 中添加支持，以便同时为多个设备插件 API 提供服务。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
With this refactoring work, it is now mandatory for a device plugin to start serving its gRPC
|
||||||
|
service before registering itself with kubelet. Previously, these two operations were asynchronous
|
||||||
|
and device plugin could register itself before starting its gRPC server which is no longer the
|
||||||
|
case. For more details, refer to [PR #109016](https://github.com/kubernetes/kubernetes/pull/109016) and [Issue #112395](https://github.com/kubernetes/kubernetes/issues/112395).
|
||||||
|
-->
|
||||||
|
通过这次重构工作，现在设备插件必须在向 kubelet 注册之前开始提供其 gRPC 服务。
|
||||||
|
之前这两个操作是异步的，设备插件可以在启动其 gRPC 服务器之前注册自己，但现在不再允许。
|
||||||
|
更多细节请参考 [PR #109016](https://github.com/kubernetes/kubernetes/pull/109016) 和
|
||||||
|
[Issue #112395](https://github.com/kubernetes/kubernetes/issues/112395)。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
### Dynamic resource allocation
|
||||||
|
In Kubernetes 1.26, inspired by how [Persistent Volumes](/docs/concepts/storage/persistent-volumes)
|
||||||
|
are handled in Kubernetes, [Dynamic Resource Allocation](/docs/concepts/scheduling-eviction/dynamic-resource-allocation/)
|
||||||
|
has been introduced to cater to devices that have more sophisticated resource requirements like:
|
||||||
|
-->
|
||||||
|
### 动态资源分配
|
||||||
|
|
||||||
|
在 Kubernetes 1.26 中，受 Kubernetes
|
||||||
|
处理[持久卷](/zh-cn/docs/concepts/storage/persistent-volumes)方式的启发，
|
||||||
|
引入了[动态资源分配](/zh-cn/docs/concepts/scheduling-eviction/dynamic-resource-allocation/)，
|
||||||
|
以满足那些具有更复杂资源需求的设备，例如：
|
||||||
|
|
||||||
|
<!--
|
||||||
|
1. Decouple device initialization and allocation from the pod lifecycle.
|
||||||
|
1. Facilitate dynamic sharing of devices between containers and pods.
|
||||||
|
1. Support custom resource-specific parameters
|
||||||
|
1. Enable resource-specific setup and cleanup actions
|
||||||
|
1. Enable support for Network-attached resources, not just node-local resources
|
||||||
|
-->
|
||||||
|
1. 将设备的初始化和分配与 Pod 生命周期解耦。
|
||||||
|
1. 促进容器和 Pod 之间设备的动态共享。
|
||||||
|
1. 支持自定义特定资源参数。
|
||||||
|
1. 启用特定资源的设置和清理操作。
|
||||||
|
1. 实现对网络附加资源的支持，不再局限于节点本地资源。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
## Is the Device Plugin API stable now?
|
||||||
|
No, the Device Plugin API is still not stable; the latest Device Plugin API version
|
||||||
|
available is `v1beta1`. There are plans in the community to introduce `v1beta2` API
|
||||||
|
to service multiple plugin APIs at once. A per-API call with request/response types
|
||||||
|
would allow adding support for newer API versions without explicitly bumping the API.
|
||||||
|
-->
|
||||||
|
## 设备插件 API 目前已经稳定了吗？
|
||||||
|
不，设备插件 API 仍然不稳定；目前最新的可用设备插件 API 版本是 `v1beta1`。
|
||||||
|
社区计划引入 `v1beta2` API，以便同时为多个插件 API 提供服务。
|
||||||
|
对每个 API 的调用都具有请求/响应类型，可以在不明确升级 API 的情况下添加对新 API 版本的支持。
|
||||||
|
|
||||||
|
<!--
|
||||||
|
In addition to that, there are existing proposals in the community to introduce additional
|
||||||
|
endpoints [KEP-3162: Add Deallocate and PostStopContainer to Device Manager API](https://github.com/kubernetes/enhancements/issues/3162).
|
||||||
|
-->
|
||||||
|
除此之外，社区中存在一些提案，打算引入额外的端点
|
||||||
|
[KEP-3162: Add Deallocate and PostStopContainer to Device Manager API](https://github.com/kubernetes/enhancements/issues/3162)。
|
||||||
Loading…
Reference in New Issue