一、引言&背景   完成度：100%

a) 事件脈絡

昨日在SIT環境做發布，發布后訪問發現變成了503，之后又變成了500.0，而后又變成了500.31，如下例外及圖，于是開始排查，

1. 503，Service Unavailable，可能是網站超過了IIS限制，博主判斷不存在此種情況，也不符合特征，于是查找了應用程式池，發現其中的應用被停用了，于是重啟了應用程式池，這時候發現報的錯不一樣了，

2. 于是開始排查部署，可能是之前部署的方式不正確，造成.NetCore啟動有一定問題，于是打開了.NetCore程式的配置，開啟啟動日志監控，根據啟動日志發現了一些資訊，進而排查問題，最終解決，如下是.NetCore啟動失敗的一些回傳資訊：

HTTP Error 500.0 - ANCM In-Process Handler Load Failure
Common causes of this issue:
●The specified version of Microsoft.NetCore.App or Microsoft.AspNetCore.App was not found.
●The in process request handler, Microsoft.AspNetCore.Server.lIS, was not referenced in the application.
●ANCM could not find dotnet.
Troubleshooting steps:
●Check the system event log for error messages
●Enable logging the application process' stdout messages
●Attach a debugger to the application process and inspect
For more information visit: https://go.microsoft. com/fwlink/?LinklD=2028526

HTTP Error 500.31 - ANCM Failed to Find Native Dependencies
Common solutions to this issue:
The specified version of Microsoft.NetCore.App or Microsoft.AspNetCore.App was not found.
Specific error detected by ANCM:
It was not possible to find any compatible framework version The framework 'Microsoft.AspNetCore.App', version '2.2.0' (x64)was not found. - The following frameworks were found: 2.1.30 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] 3.1.18 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] 5.0.9 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] 6.0.0-rc.1.21452.15 at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] You can resolve the problem by installing the specified framework and/or SDK. The specified framework can be found at: - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.AspNetCore.App&framework_version=2.2.0&arch=x64&rid=win10-x64
Troubleshooting steps:
Check the system event log for error messages
Enable logging the application process' stdout messages
Attach a debugger to the application process and inspect
For more information visit: https://go.microsoft.com/fwlink/?LinkID=2028526

3. 最終根據.NetCore啟動日志，發現了缺失了.NetCore依賴包JSON檔案，如第二章節，

b) 應用場景

• .NetCore啟動報錯，

二、排查.NetCore啟動失敗詳細程序   完成度：100%

a) 配置記錄啟動錯誤日志

如果是寄托于IIS，則在web.config中加入一段配置，stdoutLogEnabled值設定為true即可，Arguments值設定為應用名稱即可，

<aspNetCore processPath="dotnet"
        arguments=".\MyApp.dll"
        stdoutLogEnabled="true"
        stdoutLogFile=".\logs\stdout">
</aspNetCore>

配置完后則在日志路徑下可找到日志檔案，如圖：

b) 詳細資訊

如圖，日志顯示缺失了runtimeconfig.json以及deps.json檔案，

A fatal error was encountered. The library 'hostpolicy.dll' required to execute the application was not found in 'D:\MCSSolution\XXXXX\publish\'.
Failed to run as a self-contained app. If this should be a framework-dependent app, add the D:\MCSSolution\XXXXX\publish\XXXXX.runtimeconfig.json file specifying the appropriate framework.

Application startup exception: System. IO. FileNotFoundException: Could not find file
'D: \MCSSolution\XXXXX\publish\XXXX.deps.json'.
File name: 'D:'\publish\XXXX. deps. json'
at System. I0. Filestream. ValidateF ileHandle(SafeF ileHandle fileHandle)
at System. I0. FileStream. CreateFileOpenHandle(FileMode mode, FileShare share, FileOptions options)
at System. IO. FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
at System. IO. FileStream.ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System. IO.File .OpenRead(String path)
at Microsoft.Extensions.DependencyModel. Filewrapper.OpenRead(String path)
at Microsoft.Extensions.DependencyModel.DependencyContextLoader.LoadContext(IDependencyContextReader reader, string location)
at Microsoft.Extensions.DependencyModel.DependencyContextLoader.Load(Assembly assembly)
at Microsoft.Extens ions.DependencyModel.DependencyContext.Load(Assembly assembly)
at Microsoft.AspNetCore.MvC.ApplicationParts .Applicat ionAssembliesProvider.LoadDependencyContext(Assembly assembly)
at Microsoft.AspNetCore. MvC .ApplicationParts.ApplicationAssembliesProvider.ResolveAssemblies
(Assembly entryAssembly)+MoveNext()
at Microsoft.AspNetCore.Mvc.ApplicationParts.Applicat ionPartManager.PopulateDefaultParts
(String entryAssemblyName)
at Microsoft.Extens ions.DependencyInjection.MvcCoreServiceCollectionExtens ions.GetApplicationPa
rtManager(IServiceCollection services)

三、宣告與參考資料   完成度：100%

原創博文，未經許可請勿轉載，

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