一 简介

无论是微服务还是其他任何分布式系统，都需要一个统一处理日志的系统，这个系统

必须有收集，索引，分析查询的功能。asp

.net core自己的日志是同步方式的，正如文档所言：

所以必须自己提供一个日志提供程序，那正如文档所言，还有什么比kafka更合适的呢。

从kafka往后那就是elasticsearch      kibana，那是自然而然的事情。

二 asp.net core 日志详解

概念：

类别：类别是以使用的用途进行分类的，比如var log= LoggerFac.CreateLogger<Startup>();这一句，

以StartUp类的全名作为一个分类，还有一些内置的system，Microsoft，主要是为了更细粒度控制日志。

如果StartUp类出现了问题，打印日志就可以控制在StartUp这一类别下，为这个类别设置debug，

仅仅打印这个类别这个级别的日志信息，使用filter功能可以很容易控制。

日志级别：Trace，debug，info，warning，error等

Trace：因为可以看到组件内部运行状况，而且会有很大安全隐患，所以不建议在生产开启这个功能，

比如mysql lib库的trace可以打印出数据库连接字符串的。

日志提供程序：日志提供程序可以看作日志信息的的io重定向。

控制台：这个不用说了。

调试：就是debug，在 Linux 中，此提供程序将日志写入 /var/log/message。

在windows中就是经典的System.Diagnostics.Debug功能，这是.net提供的调试功能，

非常详细，在开发中非常有用，而且通过配置可以自定义存储，比如一个log文件。

下面是vs中最常见的。

EventSource 提供程序在windows下可用，在linux下没可用但是没有相关事件，所以和没用一样。

Windows EventLog 提供程序和TraceSource 提供程序都是在windows环境下是使用。

三 开发

添加各种事件提供程序：因为是windows下所以EventSource事件是可以用的。

 var host = new WebHostBuilder().ConfigureAppConfiguration((webHostBuild,configBuild) =>

            {

                var env = webHostBuild.HostingEnvironment;

                configBuild.AddJsonFile("appsettings.json")

                .AddJsonFile($"appsettings.{env.EnvironmentName}.json"

                ,optional:true,reloadOnChange:true)

                .SetBasePath(Directory.GetCurrentDirectory());

            }).ConfigureLogging((hostingContext, logging) => {

                logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"))

                .AddConsole()

                .AddDebug()

                .AddEventSourceLogger();

            }).UseKestrel()

            .UseStartup<Startup>();

             host.Start();

            Console.ReadKey();
{

  "Logging": {

    "LogLevel": {

      "Default": "Debug",

      "System": "Information",

      "Microsoft": "Information"

    }

  }

}

日志配置：默认日志debug,system分类info级别，Microsoft分类是info级别。

这个LogLevel下的节点就是日志筛选功能。

{

  "Logging": {

    "LogLevel": {

      "Default": "Debug",

      "System": "Information",

      "Microsoft": "Information"

    }

  }

}

windows运行效果：只给加console

testtesttest

dbug: Walt.TestMcroServoces.Webapi.Startup[]

      服务配置完成

dbug: Microsoft.AspNetCore.Hosting.Internal.WebHost[]

      Hosting starting

info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      User profile is available. Using 'C:\Users\Administrator\AppData\Local\ASP.NET\DataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest.

dbug: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[]

      Reading data from file 'C:\Users\Administrator\AppData\Local\ASP.NET\DataProtection-Keys\key-7fc5773e-c3fa-4523-b57f-aee522ecc0c2.xml'.

dbug: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[]

      Reading data from file 'C:\Users\Administrator\AppData\Local\ASP.NET\DataProtection-Keys\key-b6c77378-6ca9-4d96-a5e2-f5952a8c2a6f.xml'.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      Found key {7fc5773e-c3fa--b57f-aee522ecc0c2}.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      Found key {b6c77378-6ca9-4d96-a5e2-f5952a8c2a6f}.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.DefaultKeyResolver[]

      Considering key {7fc5773e-c3fa--b57f-aee522ecc0c2} with expiration date -- ::30Z as default key.

dbug: Microsoft.AspNetCore.DataProtection.TypeForwardingActivator[]

      Forwarded activator type request from Microsoft.AspNetCore.DataProtection.XmlEncryption.DpapiXmlDecryptor, Microsoft.AspNetCore.DataProtection, Version=2.0.2.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 to Microsoft.AspNetCore.DataProtection.XmlEncryption.DpapiXmlDecryptor, Microsoft.AspNetCore.DataProtection, Culture=neutral, PublicKeyToken=adb9793829ddae60

dbug: Microsoft.AspNetCore.DataProtection.XmlEncryption.DpapiXmlDecryptor[]

      Decrypting secret element using Windows DPAPI.

dbug: Microsoft.AspNetCore.DataProtection.TypeForwardingActivator[]

      Forwarded activator type request from Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ConfigurationModel.AuthenticatedEncryptorDescriptorDeserializer, Microsoft.AspNetCore.DataProtection, Version=2.0.2.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 to Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ConfigurationModel.AuthenticatedEncryptorDescriptorDeserializer, Microsoft.AspNetCore.DataProtection, Culture=neutral, PublicKeyToken=adb9793829ddae60

dbug: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.CngCbcAuthenticatedEncryptorFactory[]

      Opening CNG algorithm 'AES' from provider '(null)' with chaining mode CBC.

dbug: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.CngCbcAuthenticatedEncryptorFactory[]

      Opening CNG algorithm 'SHA256' from provider '(null)' with HMAC.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider[]

      Using key {7fc5773e-c3fa--b57f-aee522ecc0c2} as the default key.

dbug: Microsoft.AspNetCore.DataProtection.Internal.DataProtectionStartupFilter[]

      Key ring with default key {7fc5773e-c3fa--b57f-aee522ecc0c2} was loaded during application startup.

info: Walt.TestMcroServoces.Webapi.Startup[]

      infomation

dbug: Microsoft.AspNetCore.Mvc.MvcJsonOptions[]

      Compatibility switch AllowInputFormatterExceptionMessages in type MvcJsonOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch AllowCombiningAuthorizeFilters in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch AllowBindingHeaderValuesToNonStringModelTypes in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch AllowValidatingTopLevelNodes in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch InputFormatterExceptionPolicy in type MvcOptions is using compatibility value MalformedInputExceptions for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch SuppressBindingUndefinedValueToEnumType in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[]

      Compatibility switch AllowAreas in type RazorPagesOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[]

      Compatibility switch AllowMappingHeadRequestsToGetHandler in type RazorPagesOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcViewOptions[]

      Compatibility switch SuppressTempDataAttributePrefix in type MvcViewOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.ModelBinding.ModelBinderFactory[]

      Registered model binder providers, in the following order: Microsoft.AspNetCore.Mvc.ModelBinding.Binders.BinderTypeModelBinderProvider

linux下docker运行效果：debug和 console

testtesttest

dbug: Microsoft.AspNetCore.Hosting.Internal.WebHost[]

      Hosting starting

info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      User profile is available. Using '/root/.aspnet/DataProtection-Keys' as key repository; keys will not be encrypted at rest.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.DefaultKeyResolver[]

      Repository contains no viable default key. Caller should generate a key with immediate activation.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider[]

      Policy resolution states that a new key should be added to the key ring.

info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      Creating key {0fe5f8aa---83aa-59df0ed4f0c8} with creation date -- ::09Z, activation date -- ::09Z, and expiration date -- ::09Z.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      Descriptor deserializer type for key {0fe5f8aa---83aa-59df0ed4f0c8} is 'Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ConfigurationModel.AuthenticatedEncryptorDescriptorDeserializer, Microsoft.AspNetCore.DataProtection, Version=2.1.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      No key escrow sink found. Not writing key {0fe5f8aa---83aa-59df0ed4f0c8} to escrow.

warn: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      No XML encryptor configured. Key {0fe5f8aa---83aa-59df0ed4f0c8} may be persisted to storage in unencrypted form.

info: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[]

      Writing data to file '/root/.aspnet/DataProtection-Keys/key-0fe5f8aa-0875-4612-83aa-59df0ed4f0c8.xml'.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      Key cache expiration token triggered by 'CreateNewKey' operation.

dbug: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[]

      Reading data from file '/root/.aspnet/DataProtection-Keys/key-0fe5f8aa-0875-4612-83aa-59df0ed4f0c8.xml'.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[]

      Found key {0fe5f8aa---83aa-59df0ed4f0c8}.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.DefaultKeyResolver[]

      Considering key {0fe5f8aa---83aa-59df0ed4f0c8} with expiration date -- ::09Z as default key.

dbug: Microsoft.AspNetCore.DataProtection.TypeForwardingActivator[]

      Forwarded activator type request from Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ConfigurationModel.AuthenticatedEncryptorDescriptorDeserializer, Microsoft.AspNetCore.DataProtection, Version=2.1.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60 to Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ConfigurationModel.AuthenticatedEncryptorDescriptorDeserializer, Microsoft.AspNetCore.DataProtection, Culture=neutral, PublicKeyToken=adb9793829ddae60

dbug: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ManagedAuthenticatedEncryptorFactory[]

      Using managed symmetric algorithm 'System.Security.Cryptography.Aes'.

dbug: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ManagedAuthenticatedEncryptorFactory[]

      Using managed keyed hash algorithm 'System.Security.Cryptography.HMACSHA256'.

dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider[]

      Using key {0fe5f8aa---83aa-59df0ed4f0c8} as the default key.

dbug: Microsoft.AspNetCore.DataProtection.Internal.DataProtectionStartupFilter[]

      Key ring with default key {0fe5f8aa---83aa-59df0ed4f0c8} was loaded during application startup.

info: Walt.TestMcroServoces.Webapi.Startup[]

      infomation

dbug: Microsoft.AspNetCore.Mvc.MvcJsonOptions[]

      Compatibility switch AllowInputFormatterExceptionMessages in type MvcJsonOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch AllowCombiningAuthorizeFilters in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch AllowBindingHeaderValuesToNonStringModelTypes in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch AllowValidatingTopLevelNodes in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch InputFormatterExceptionPolicy in type MvcOptions is using compatibility value MalformedInputExceptions for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcOptions[]

      Compatibility switch SuppressBindingUndefinedValueToEnumType in type MvcOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[]

      Compatibility switch AllowAreas in type RazorPagesOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[]

      Compatibility switch AllowMappingHeadRequestsToGetHandler in type RazorPagesOptions is using compatibility value True for version Version_2_1

dbug: Microsoft.AspNetCore.Mvc.MvcViewOptions[]

      Compatibility switch SuppressTempDataAttributePref

总结：asp.net core中集成了很多以前.net的日志和调试功能，有点混乱，linux目前能用的提供程序有console和debug，EventSource和事件查看器还有Trace只能在windows专用。上面日志有一些区别，所以加debug提供程序，在相同分类和都具有console提供程序下debug会多出一些信息，所以并不是每个提供程序都共享所有日志信息，根据提供程序不同，会有多余的一些日志信息被加进来。但是如上图所示，并不影响，因为仅仅是一些系统级别的debug提供程序会多出一些信息，mvc模块给出的信息完全一致。

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