サービスはリクエストをリッスンする必要があります。リクエストの送信に使われるポートを構成できます。Cloud Run インスタンス内では、リクエスト送信先ポートが PORT 環境変数の値に常に反映されます。この PORT 環境変数が存在するかどうかをコードで検査してください。存在する場合は、移植性が最大になるようそのポートでリッスンするのが適切です。
サービスはステートレスである必要があります。永続的なローカル状態に依存することはできません。
サービスがリクエスト処理の範囲外のバックグラウンド アクティビティを実行する場合、標準のリクエスト サイクル外で CPU を割り当てるには、インスタンスベースの課金設定を使用する必要があります。
[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-09-04 UTC。"],[],[],null,["# Developing your service\n\nThis page describes a few things you need to know to get started in developing\na service for Cloud Run.\n\nCode requirements\n-----------------\n\nYou must meet the following requirements when you develop a service:\n\n- The service must listen for requests. You can [configure the port](/run/docs/configuring/services/containers#configure-port) on which requests are sent. Inside Cloud Run instances, the value of the `PORT` environment variable always reflects the port to which requests are sent. Your code should check for the existence of this `PORT` environment variable and if it is present, should listen on it to maximize portability.\n- The service must be *stateless* . It cannot rely on a persistent **local** state.\n- If the service performs background activities outside the scope of request handling it must use the [instance-based billing](/run/docs/configuring/billing-settings#choosing-background-execution) setting in order to have CPU allocated outside of the standard request cycle.\n- If your service uses NFS, it must use the [second generation execution environment](/run/docs/about-execution-environments).\n\nYou can find more details about these constraints in the [Container runtime contract](/run/docs/reference/container-contract).\n\nProgramming language support\n----------------------------\n\nCloud Run source deployment conveniently supports multiple\n[language runtimes](/run/docs/configuring/services/runtime-base-images), each of\nwhich is available through container base images provided by\nGoogle Cloud's buildpacks. You can also use other programming languages or\nframeworks, as long as the source code is in an OCI-compliant image.\n\nThe [build and deploy quickstarts](/run/docs/quickstarts#build-and-deploy-a-web-service)\nprovides samples in many popular languages.\n\nUsing a web server\n------------------\n\nYou can use a web server to listen on the required port, and to process and\nroute incoming requests. For example, Node.js developers can use\n[Express.js](https://expressjs.com/), Python developers can use\n[Flask](http://flask.pocoo.org/), Ruby developers can use\n[Sinatra](http://sinatrarb.com/), and so forth.\n\nContainerizing your code\n------------------------\n\nSee [Containerize your code](/run/docs/building/containerize-your-code) for\ndetails.\n\nDesign Cloud Run apps with Gemini assistance\n--------------------------------------------\n\n\u003cbr /\u003e\n\n|\n| **Preview**\n|\n|\n| This product or feature is subject to the \"Pre-GA Offerings Terms\" in the General Service Terms section\n| of the [Service Specific Terms](/terms/service-terms#1).\n|\n| Pre-GA products and features are available \"as is\" and might have limited support.\n|\n| For more information, see the\n| [launch stage descriptions](/products#product-launch-stages).\n\nYou can get AI-powered help from\n[Gemini Cloud Assist](/gemini/docs/cloud-assist/overview) chat to\ndesign applications optimally. With Gemini Cloud Assist, you can\ndiscover the most suitable configurations and strategies for deploying your\napplications on Cloud Run, ensuring efficient resource\nutilization and seamless operation.\n\nTo use Gemini Cloud Assist from the Google Cloud console, do\nthe following:\n\n1. [Ensure that Gemini Cloud Assist is set up for your Google Cloud user account and project](/gemini/docs/cloud-assist/set-up-gemini).\n\n2. [Set up your Cloud Run development environment](/run/docs/setup)\n in your Google Cloud project and ensure you have the appropriate\n [deployment permissions](/run/docs/reference/iam/roles#additional-configuration).\n\n3. Go to the Cloud Run page in the Google Cloud console.\n\n [Go to Cloud Run](https://console.cloud.google.com/run)\n4. In the console toolbar, select a Google Cloud project. Use a project\n associated with a project ID you submitted after you were granted access to\n Gemini Cloud Assist.\n\n5. Click spark\n **Open or close Gemini AI chat**.\n\n The Gemini panel opens.\n6. If necessary, click **Accept** if you agree to the terms.\n\n7. If you have a question about a specific application, provide context by\n going to the page that shows your resource before asking your question. When\n generating a response, Gemini includes information about the\n current console page and project.\n\n8. Enter a prompt in the **Gemini** panel.\n\n The following table provide some example prompts for using\n Gemini Cloud Assist with Cloud Run.\n\nFor more details, see the following resources:\n\n- Learn how to [write better prompts](/gemini/docs/discover/write-prompts).\n- Learn how to use the [Gemini Cloud Assist panel](/gemini/docs/cloud-assist-panel).\n- Read [Use Gemini for AI assistance and development](/gemini/docs/overview).\n- Learn [how Gemini for Google Cloud uses your data](/gemini/docs/discover/data-governance).\n\nWhat's next\n-----------\n\n- Once you have your service code and Dockerfile, you should [build a container image](/run/docs/building/containers) then continue iterating in [local testing](/run/docs/testing/local).\n- If you are migrating an existing web application, see [Migrating Your Service to Cloud Run](/run/docs/migrating).\n- For best practices for designing, implementing, testing, and deploying a Cloud Run service, see the [Development tips](/run/docs/tips)."]]
