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<ins> --- layout: blog title: "Kubernetes 1.24: 卷填充器功能进入 Beta 阶段" date: 2022-05-16 slug: volume-populators-beta --- <!-- layout: blog title: "Kubernetes 1.24: Volume Populators Graduate to Beta" date: 2022-05-16 slug: volume-populators-beta --> <!-- **Author:** Ben Swartzlander (NetApp) --> **作者：** Ben Swartzlander (NetApp) <!-- The volume populators feature is now two releases old and entering beta! The `AnyVolumeDataSouce` feature gate defaults to enabled in Kubernetes v1.24, which means that users can specify any custom resource as the data source of a PVC. --> 卷填充器功能现在已经经历两个发行版本并进入 Beta 阶段！ 在 Kubernetes v1.24 中 `AnyVolumeDataSouce` 特性门控默认被启用。 这意味着用户可以指定任何自定义资源作为 PVC 的数据源。 <!-- An [earlier blog article](/blog/2021/08/30-volume-populators-redesigned/) detailed how the volume populators feature works. In short, a cluster administrator can install a CRD and associated populator controller in the cluster, and any user who can create instances of the CR can create pre-populated volumes by taking advantage of the populator. --> [之前的一篇博客](/blog/2021/08/30-volume-populators-alpha/)详细介绍了卷填充器功能的工作原理。 简而言之，集群管理员可以在集群中安装 CRD 和相关的填充器控制器， 任何可以创建 CR 实例的用户都可以利用填充器创建预填充卷。 <!-- Multiple populators can be installed side by side for different purposes. The SIG storage community is already seeing some implementations in public, and more prototypes should appear soon. --> 出于不同的目的，可以一起安装多个填充器。存储 SIG 社区已经有了一些公开的实现，更多原型应该很快就会出现。 <!-- Cluster administrations are **strongly encouraged** to install the volume-data-source-validator controller and associated `VolumePopulator` CRD before installing any populators so that users can get feedback about invalid PVC data sources. --> **强烈建议**集群管理人员在安装任何填充器之前安装 volume-data-source-validator 控制器和相关的 `VolumePopulator` CRD，以便用户可以获得有关无效 PVC 数据源的反馈。 <!-- ## New Features --> ## 新功能 <!-- The [lib-volume-populator](https://github.com/kubernetes-csi/lib-volume-populator) library on which populators are built now includes metrics to help operators monitor and detect problems. This library is now beta and latest release is v1.0.1. --> 构建填充器的 [lib-volume-populator](https://github.com/kubernetes-csi/lib-volume-populator) 库现在包含可帮助操作员监控和检测问题的指标。这个库现在是 beta 阶段，最新版本是 v1.0.1。 <!-- The [volume data source validator](https://github.com/kubernetes-csi/volume-data-source-validator) controller also has metrics support added, and is in beta. The `VolumePopulator` CRD is beta and the latest release is v1.0.1. --> [卷数据源校验器](https://github.com/kubernetes-csi/volume-data-source-validator)控制器也添加了指标支持， 处于 beta 阶段。`VolumePopulator` CRD 是 beta 阶段，最新版本是 v1.0.1。 <!-- ## Trying it out --> ## 尝试一下 <!-- To see how this works, you can install the sample "hello" populator and try it out. --> 要查看它是如何工作的，你可以安装 “hello” 示例填充器并尝试一下。 <!-- First install the volume-data-source-validator controller. --> 首先安装 volume-data-source-validator 控制器。 ```shell kubectl apply -f https://raw.githubusercontent.com/kubernetes-csi/volume-data-source-validator/v1.0.1/client/config/crd/populator.storage.k8s.io_volumepopulators.yaml kubectl apply -f https://raw.githubusercontent.com/kubernetes-csi/volume-data-source-validator/v1.0.1/deploy/kubernetes/rbac-data-source-validator.yaml kubectl apply -f https://raw.githubusercontent.com/kubernetes-csi/volume-data-source-validator/v1.0.1/deploy/kubernetes/setup-data-source-validator.yaml ``` <!-- Next install the example populator. --> 接下来安装 hello 示例填充器。 ```shell kubectl apply -f https://raw.githubusercontent.com/kubernetes-csi/lib-volume-populator/v1.0.1/example/hello-populator/crd.yaml kubectl apply -f https://raw.githubusercontent.com/kubernetes-csi/lib-volume-populator/87a47467b86052819e9ad13d15036d65b9a32fbb/example/hello-populator/deploy.yaml ``` <!-- Your cluster now has a new CustomResourceDefinition that provides a test API named Hello. Create an instance of the `Hello` custom resource, with some text: --> 你的集群现在有一个新的 CustomResourceDefinition，它提供了一个名为 Hello 的测试 API。 创建一个 `Hello` 自定义资源的实例，内容如下： ```yaml apiVersion: hello.example.com/v1alpha1 kind: Hello metadata: name: example-hello spec: fileName: example.txt fileContents: Hello, world! ``` <!-- Create a PVC that refers to that CR as its data source. --> 创建一个将该 CR 引用为其数据源的 PVC。 ```yaml apiVersion: v1 kind: PersistentVolumeClaim metadata: name: example-pvc spec: accessModes: - ReadWriteOnce resources: requests: storage: 10Mi dataSourceRef: apiGroup: hello.example.com kind: Hello name: example-hello volumeMode: Filesystem ``` <!-- Next, run a Job that reads the file in the PVC. --> 接下来，运行一个读取 PVC 中文件的 Job。 ```yaml apiVersion: batch/v1 kind: Job metadata: name: example-job spec: template: spec: containers: - name: example-container image: busybox:latest command: - cat - /mnt/example.txt volumeMounts: - name: vol mountPath: /mnt restartPolicy: Never volumes: - name: vol persistentVolumeClaim: claimName: example-pvc ``` <!-- Wait for the job to complete (including all of its dependencies). --> 等待 Job 完成（包括其所有依赖项）。 ```shell kubectl wait --for=condition=Complete job/example-job ``` <!-- And last examine the log from the job. --> 最后检查 Job 中的日志。 ```shell kubectl logs job/example-job ``` <!-- The output should be: --> 输出应该是： ```terminal Hello, world! ``` <!-- Note that the volume already contained a text file with the string contents from the CR. This is only the simplest example. Actual populators can set up the volume to contain arbitrary contents. --> 请注意，该卷已包含一个文本文件，其中包含来自 CR 的字符串内容。这只是最简单的例子。 实际填充器可以将卷设置为包含任意内容。 <!-- ## How to write your own volume populator --> ## 如何编写自己的卷填充器 <!-- Developers interested in writing new poplators are encouraged to use the [lib-volume-populator](https://github.com/kubernetes-csi/lib-volume-populator) library and to only supply a small controller wrapper around the library, and a pod image capable of attaching to volumes and writing the appropriate data to the volume. --> 鼓励有兴趣编写新的填充器的开发人员使用 [lib-volume-populator](https://github.com/kubernetes-csi/lib-volume-populator) 库， 只提供一个小型控制器，以及一个能够连接到卷并向卷写入适当数据的 Pod 镜像。 <!-- Individual populators can be extremely generic such that they work with every type of PVC, or they can do vendor specific things to rapidly fill a volume with data if the volume was provisioned by a specific CSI driver from the same vendor, for example, by communicating directly with the storage for that volume. --> 单个填充器非常通用，它们可以与所有类型的 PVC 一起使用， 或者如果卷是来自同一供应商的特定 CSI 驱动程序供应的， 它们可以执行供应商特定的的操作以快速用数据填充卷，例如，通过通信直接使用该卷的存储。 <!-- ## How can I learn more? --> ## 我怎样才能了解更多？ <!-- The enhancement proposal, [Volume Populators](https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/1495-volume-populators), includes lots of detail about the history and technical implementation of this feature. --> 增强提案， [卷填充器](https://github.com/kubernetes/enhancements/tree/master/keps/sig-storage/1495-volume-populators)， 包含有关此功能的历史和技术实现的许多详细信息。 <!-- [Volume populators and data sources](/docs/concepts/storage/persistent-volumes/#volume-populators-and-data-sources), within the documentation topic about persistent volumes, explains how to use this feature in your cluster. --> [卷填充器与数据源](/zh/docs/concepts/storage/persistent-volumes/#volume-populators-and-data-sources), 在有关持久卷的文档主题中，解释了如何在集群中使用此功能。 <!-- Please get involved by joining the Kubernetes storage SIG to help us enhance this feature. There are a lot of good ideas already and we'd be thrilled to have more! --> 请加入 Kubernetes 的存储 SIG，帮助我们增强这一功能。这里已经有很多好的主意了，我们很高兴能有更多！ </ins>