May 2025
Intermediate to advanced
356 pages
3h 47m
Chinese
Content preview from 《使用 Kubernetes 实现云原生 DevOps（第二版）》
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第 13 章 开发工作流程 开发工作流程
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冲浪是一个令人惊叹的概念。你拿着一根小棍子，对大自然说：我要驾驭你！很多时候，大自然会说，不，你不行！然后把你摔到谷底。
乔琳娜-布洛克
在本章中，我们将扩展第 12 章中的讨论，将注意力转向整个应用生命周期，从本地开发到将更新部署到 Kubernetes 集群，包括数据库迁移这个棘手的话题。我们将介绍一些帮助你开发、测试和部署应用程序的工具，包括 Skaffold 和 Telepresence。我们还将介绍 Knative 和 OpenFaaS，它们是在集群上运行 "无服务器 "架构的两种选择。我们还将了解更复杂的部署，以及使用 Helm 钩子订购应用程序的推出。
开发工具
在第 12 章中，我们介绍了一些帮助你编写、构建和部署 Kubernetes 资源清单的工具。就目前而言，这样做很好，但当你开发在 Kubernetes 中运行的应用程序时，你往往希望能够立即尝试并看到变化，而无需经历完整的构建-推送-部署-更新循环。
斯卡福德
Skaffold是谷歌推出的一款开源工具，旨在提供快速的本地开发工作流程。它能在本地开发过程中自动重建容器，并将这些变更部署到本地或远程集群。
您可以在存储库中的skaffold.yaml文件中定义所需的工作流程，然后运行skaffold 命令行工具启动管道。当您对本地目录中的文件进行更改时，Skaffold 会自动唤醒，根据更改内容构建一个新容器，然后自动为您部署，从而节省您往返容器的时间。
我们在demo repo中提供了一个 Skaffold 示例，展示它是如何工作的。按照操作系统的 Skaffold安装说明，将kubectl 指向本地开发 Kubernetes 集群，然后切换到hello-skaffold目录，看看它是如何工作的：
cd hello-skaffoldskaffold devListing files to watch...- skaffold-demoGenerating tags...- skaffold-demo -> skaffold-demo:e50c9e7-dirtyChecking cache...- skaffold-demo: Found LocallyTags used in deployment:- skaffold-demo -> skaffold-demo:39f0eb63b0ced173...Starting deploy...Helm release demo not installed. Installing...NAME: demoNAMESPACE: demoSTATUS: deployedREVISION: 1TEST SUITE: NoneWaiting for deployments to stabilize...- demo:deployment/demo is ready.Deployments stabilized in 1.097 secondPress Ctrl+C to exitWatching for changes......
Skaffold 使用 Helm 自动构建并部署了演示应用程序，现在正密切关注代码或图表的变化。在您进行开发时，它会使用随机生成的 SHA 作为临时占位符容器标签。如果您访问curl localhost:8888 ...
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