Azure應用服務：使用PerformanceCounters

Question

我想設置我的Azure Web應用程序以包含使用第三方軟件，這似乎需要訪問PerformanceCounters。本地這工作得很好，但是當我在Azure上運行它，我得到以下錯誤：

[UnauthorizedAccessException: Access to the registry key 'Global' is denied.] 
Microsoft.Win32.RegistryKey.Win32Error(Int32 errorCode, String str) +5230217 
Microsoft.Win32.RegistryKey.InternalGetValue(String name, Object defaultValue, Boolean doNotExpand, Boolean checkSecurity) +11769029 
Microsoft.Win32.RegistryKey.GetValue(String name) +40 
System.Diagnostics.PerformanceMonitor.GetData(String item) +102 
System.Diagnostics.PerformanceCounterLib.GetPerformanceData(String item) +186 
System.Diagnostics.PerformanceCounterLib.get_CategoryTable() +105 
System.Diagnostics.PerformanceCounterLib.GetCategorySample(String category) +17 
System.Diagnostics.PerformanceCounterLib.GetCategorySample(String machine, String category) +61 
System.Diagnostics.PerformanceCounterCategory.GetCounterInstances(String categoryName, String machineName) +70 
System.Diagnostics.PerformanceCounterCategory.GetInstanceNames() +25 

據this answer，我應該將IIS配置爲允許訪問的應用程序池/用戶，但我不認爲對於Azure Web應用程序是可能的。有沒有辦法讓性能計數器在我的情況下工作？

Answer 1

在Windows上，性能計數器訪問通過WMI：
https://msdn.microsoft.com/en-us/library/aa392397(v=vs.85).aspx

WMI是在App服務沙盒限制。
從https://github.com/projectkudu/kudu/wiki/Azure-Web-App-sandbox#access-to-out-of-process-com-servers：

Access to out-of-process COM servers

Windows Servers have a bunch of COM servers configured and available for consumption by default; however the sandbox prevents access to all out-of-proc COM servers. For example, a sandboxed application cannot call into WMI, or into MSIServer.

從捻：

PS D:\home> Get-Counter -Counter "\processor(_total)\% processor time" 
Get-Counter : The specified object was not found on the computer. 


PS D:\home> Get-WmiObject -Class WIN32_OperatingSystem 
Get-WmiObject : Access is denied. (Exception from HRESULT: 0x80070005 
(E_ACCESSDENIED)) 

如果你絕對必須使用第三方軟件，看一下Azure的雲服務（與Web角色）。您仍可以完全控制操作系統，同時仍然是PaaS。