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For .NET version 3.1 and earlier, Google Cloud Tools for Visual Studio
automatically supplies an app.yaml file and a Dockerfile when you deploy to
App Engine. However, you can extend the .NET runtime to add additional
functionality by customizing the Docker image. For more information, see
Custom Runtimes.
Health checking
By default, all programs running in the flexible environment receive
health check requests,
and you don't need to write any additional code.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eGoogle Cloud Tools for Visual Studio automatically provides an \u003ccode\u003eapp.yaml\u003c/code\u003e file and a Dockerfile for .NET versions 3.1 and earlier when deploying to App Engine.\u003c/p\u003e\n"],["\u003cp\u003eYou can customize the Docker image to extend the .NET runtime with additional functionality.\u003c/p\u003e\n"],["\u003cp\u003eAll programs in the flexible environment receive health check requests by default, eliminating the need for extra code.\u003c/p\u003e\n"]]],[],null,["# Customizing the .NET Runtime\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\nFor .NET version 3.1 and earlier, Google Cloud Tools for Visual Studio\nautomatically supplies an `app.yaml` file and a Dockerfile when you deploy to\nApp Engine. However, you can extend the .NET runtime to add additional\nfunctionality by customizing the Docker image. For more information, see\n[Custom Runtimes](/appengine/docs/flexible/custom-runtimes).\n\nHealth checking\n---------------\n\nBy default, all programs running in the flexible environment receive\n[health check requests](/appengine/docs/flexible/how-instances-are-managed#health_checking),\nand you don't need to write any additional code."]]
