c# - 为什么 Application Insights 阻止我的辅助角色启动？

标签 c# azure azure-worker-roles azure-cloud-services azure-application-insights

我有一个具有单个辅助角色的 Azure 云服务，每次都会顺利部署、启动和运行，但我遇到了一些间歇性问题，我想使用 Application Insights 进行诊断。我按照 this article 的指示进行操作以及here .

安装 block 包并添加一行代码后，我在调试和 Release模式下在本地运行云服务，并且能够看到向 Application Insights 资源报告的 AI 信息。所以我将其打包并将新配置上传到我的云服务。

但是，从云中，辅助角色实际上不会启动 - 它会进入循环死亡螺旋，在“诊断和解决问题” Blade 中，我得到以下错误的变体，总是与“System.Threading”有关.AsyncLocal'1'"并且无法加载 RoleEntryPoint。正在关注this article并没有给事情带来太多启发，因为这个错误几乎告诉了我为什么它不断回收，但没有任何线索告诉我如何处理它。

Production - WebReportDownloader_IN_0: BusyRole Waiting for role to start... Failed to load role entrypoint. System.TypeLoadException: Could not load type 'System.Threading.AsyncLocal`1' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. at Microsoft.ApplicationInsights.Extensibility.SdkInternalOperationsMonitor.Exit() at Microsoft.ApplicationInsights.Extensibility.Implementation.TelemetryConfigurationFactory.Initialize(TelemetryConfiguration configuration, TelemetryModules modules, String serializedConfiguration) at Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration.get_Active() at WebReportDownloader..ctor() in C:\Users\User\Source\Repos\Program\WebReportDownloader\WebReportDownloader.cs:line 21 --- End of inner exception stack trace --- at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetRoleEntryPoint(Assembly entryPointAssembly) at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.CreateRoleEntryPoint(RoleType roleTypeEnum) at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.InitializeRoleInternal(RoleType roleTypeEnum) [2017-09-14T15:28:21Z] Last exit time: [2017/09/14, 15:28:21.944]. Last exit code: 0.

通常情况下，我可以通过搜索异常和/或详细信息获得足够的提示，但这次我找不到任何与我的问题类似的内容。我所能猜测的是，我的配置有一些小但关键的问题，但我无法根据上面链接的说明确定我在哪里偏离了轨道。

我的ServiceConfiguration.Cloud文件...

    <?xml version="1.0" encoding="utf-8"?>
<ServiceConfiguration serviceName="WebReportDownloader" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceConfiguration" osFamily="4" osVersion="*" schemaVersion="2015-04.2.6">
  <Role name="WebReportDownloader">
    <Instances count="2" />
    <ConfigurationSettings>
      <Setting name="Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString" value="UseDevelopmentStorage=true" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.Enabled" value="true" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.AccountUsername" value="admin" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.AccountEncryptedPassword" value="ENCRYPTEDVALUE" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteAccess.AccountExpiration" value="2018-09-01T23:59:59.0000000-04:00" />
      <Setting name="Microsoft.WindowsAzure.Plugins.RemoteForwarder.Enabled" value="true" />
      <Setting name="APPINSIGHTS_INSTRUMENTATIONKEY" value="KEYVALUE" />
    </ConfigurationSettings>
    <Certificates>
      <Certificate name="Microsoft.WindowsAzure.Plugins.RemoteAccess.PasswordEncryption" thumbprint="847EEDE0084CF57A5A774CAE9E700713726CC856" thumbprintAlgorithm="sha1" />
    </Certificates>
  </Role>
</ServiceConfiguration>

还有我的 ApplicationInsights.config...

<?xml version="1.0" encoding="utf-8"?>
<ApplicationInsights xmlns="http://schemas.microsoft.com/ApplicationInsights/2013/Settings">
    <TelemetryInitializers>
        <Add Type="Microsoft.ApplicationInsights.DependencyCollector.HttpDependenciesParsingTelemetryInitializer, Microsoft.AI.DependencyCollector"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.AzureRoleEnvironmentTelemetryInitializer, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.AzureWebAppRoleEnvironmentTelemetryInitializer, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.BuildInfoConfigComponentVersionTelemetryInitializer, Microsoft.AI.WindowsServer"/>
    </TelemetryInitializers>
    <TelemetryModules>
        <Add Type="Microsoft.ApplicationInsights.DependencyCollector.DependencyTrackingTelemetryModule, Microsoft.AI.DependencyCollector">
            <ExcludeComponentCorrelationHttpHeadersOnDomains>
                <!-- 
        Requests to the following hostnames will not be modified by adding correlation headers. 
        This is only applicable if Profiler is installed via either StatusMonitor or Azure Extension.
        Add entries here to exclude additional hostnames.
        NOTE: this configuration will be lost upon NuGet upgrade.
        -->
                <Add>core.windows.net</Add>
                <Add>core.chinacloudapi.cn</Add>
                <Add>core.cloudapi.de</Add>
                <Add>core.usgovcloudapi.net</Add>
                <Add>localhost</Add>
                <Add>127.0.0.1</Add>
            </ExcludeComponentCorrelationHttpHeadersOnDomains>
        </Add>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.PerformanceCollectorModule, Microsoft.AI.PerfCounterCollector">
            <!--
      Use the following syntax here to collect additional performance counters:

      <Counters>
        <Add PerformanceCounter="\Process(??APP_WIN32_PROC??)\Handle Count" ReportAs="Process handle count" />
        ...
      </Counters>

      PerformanceCounter must be either \CategoryName(InstanceName)\CounterName or \CategoryName\CounterName

      NOTE: performance counters configuration will be lost upon NuGet upgrade.

      The following placeholders are supported as InstanceName:
        ??APP_WIN32_PROC?? - instance name of the application process  for Win32 counters.
        ??APP_W3SVC_PROC?? - instance name of the application IIS worker process for IIS/ASP.NET counters.
        ??APP_CLR_PROC?? - instance name of the application CLR process for .NET counters.
      -->
        </Add>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.QuickPulse.QuickPulseTelemetryModule, Microsoft.AI.PerfCounterCollector"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.DeveloperModeWithDebuggerAttachedTelemetryModule, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.UnhandledExceptionTelemetryModule, Microsoft.AI.WindowsServer"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.UnobservedExceptionTelemetryModule, Microsoft.AI.WindowsServer">
            <!--</Add>
    <Add Type="Microsoft.ApplicationInsights.WindowsServer.FirstChanceExceptionStatisticsTelemetryModule, Microsoft.AI.WindowsServer">-->
        </Add>
    </TelemetryModules>
    <TelemetryProcessors>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.PerfCounterCollector.QuickPulse.QuickPulseTelemetryProcessor, Microsoft.AI.PerfCounterCollector"/>
        <Add Type="Microsoft.ApplicationInsights.Extensibility.AutocollectedMetricsExtractor, Microsoft.ApplicationInsights"/>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.AdaptiveSamplingTelemetryProcessor, Microsoft.AI.ServerTelemetryChannel">
            <MaxTelemetryItemsPerSecond>5</MaxTelemetryItemsPerSecond>
            <ExcludedTypes>Event</ExcludedTypes>
        </Add>
        <Add Type="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.AdaptiveSamplingTelemetryProcessor, Microsoft.AI.ServerTelemetryChannel">
            <MaxTelemetryItemsPerSecond>5</MaxTelemetryItemsPerSecond>
            <IncludedTypes>Event</IncludedTypes>
        </Add>
    </TelemetryProcessors>
    <TelemetryChannel Type="Microsoft.ApplicationInsights.WindowsServer.TelemetryChannel.ServerTelemetryChannel, Microsoft.AI.ServerTelemetryChannel"/>
<!-- 
    Learn more about Application Insights configuration with ApplicationInsights.config here: 
    http://go.microsoft.com/fwlink/?LinkID=513840

    Note: If not present, please add <InstrumentationKey>Your Key</InstrumentationKey> to the top of this file.
  --></ApplicationInsights>

还有我实际设置 InstrumentationKey 的“OnStart()”方法...

public override bool OnStart()
        {
            // Set the maximum number of concurrent connections
            ServicePointManager.DefaultConnectionLimit = 12;
            TelemetryConfiguration.Active.InstrumentationKey = RoleEnvironment.GetConfigurationSettingValue("APPINSIGHTS_INSTRUMENTATIONKEY");

            // For information on handling configuration changes
            // see the MSDN topic at https://go.microsoft.com/fwlink/?LinkId=166357.

            bool result = base.OnStart();

            Trace.TraceInformation("WebReportDownloader has been started");

            return result;
        }

我将不胜感激任何人都可以提供的任何见解(哈!)或指导......

更新:

通过进一步的实验，我确定每当我尝试直接调用 Application Insights 程序集(例如创建遥测客户端或直接设置 ApplicationInsights 资源 key 时)或由于以下原因调用 ApplicationInsight TraceListener 时跟踪下面的异常被调用

Could not load type 'System.Threading.AsyncLocal`1' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

如果我进行运行时检测，我就能够获取一些基本的跟踪信息和日志到我的 Insight 资源，但尝试获取更多信息仍然无法实现。

此外，我目前的目标是 .NET 4.6.1(我之前忽略提及的信息)。

最佳答案

经过多次与 Azure 支持的沟通，我终于能够设置屏幕共享 session 。这位乐于助人的绅士几乎立刻就注意到了问题:因为我的辅助角色项目面向 .NET 4.6.1，所以 ServiceConfiguration 文件(.Cloud.cscfg 和 .Local.cscfg)需要针对 osFamily 5。

VS17 向导生成的默认值将其设置为 osFamily=4，如下所示...

.NET 4.5.2 configuration

但是，为了使一切正常运行，我需要将 osFamily=5 作为目标，如下所示......

.NET 4.6.1 configuration

这一小小的更改允许在实例化 TelemetryClient 时正确部署 Web 角色。

关于c# - 为什么 Application Insights 阻止我的辅助角色启动？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46329504/

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