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[0] 服务配置完成 dbug: Microsoft.AspNetCore.Hosting.Internal.WebHost[3] Hosting starting info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0] User profile is available. Using 'C:UsersAdministratorAppDataLocalASP.NETDataProtection-Keys' as key repository and Windows DPAPI to encrypt keys at rest. dbug: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[37] Reading data from file 'C:UsersAdministratorAppDataLocalASP.NETDataProtection-Keyskey-7fc5773e-c3fa-4523-b57f-aee522ecc0c2.xml'. dbug: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[37] Reading data from file 'C:UsersAdministratorAppDataLocalASP.NETDataProtection-Keyskey-b6c77378-6ca9-4d96-a5e2-f5952a8c2a6f.xml'. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[18] Found key {7fc5773e-c3fa-4523-b57f-aee522ecc0c2}. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[18] Found key {b6c77378-6ca9-4d96-a5e2-f5952a8c2a6f}. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.DefaultKeyResolver[13] Considering key {7fc5773e-c3fa-4523-b57f-aee522ecc0c2} with expiration date 2019-03-03 07:56:30Z as default key. dbug: Microsoft.AspNetCore.DataProtection.TypeForwardingActivator[0] 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[51] Decrypting secret element using Windows DPAPI. dbug: Microsoft.AspNetCore.DataProtection.TypeForwardingActivator[0] 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[4] Opening CNG algorithm 'AES' from provider '(null)' with chaining mode CBC. dbug: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.CngCbcAuthenticatedEncryptorFactory[3] Opening CNG algorithm 'SHA256' from provider '(null)' with HMAC. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider[2] Using key {7fc5773e-c3fa-4523-b57f-aee522ecc0c2} as the default key. dbug: Microsoft.AspNetCore.DataProtection.Internal.DataProtectionStartupFilter[0] Key ring with default key {7fc5773e-c3fa-4523-b57f-aee522ecc0c2} was loaded during application startup. info: Walt.TestMcroServoces.Webapi.Startup[0] infomation dbug: Microsoft.AspNetCore.Mvc.MvcJsonOptions[0] Compatibility switch AllowInputFormatterExceptionMessages in type MvcJsonOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch AllowCombiningAuthorizeFilters in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch AllowBindingHeaderValuesToNonStringModelTypes in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch AllowValidatingTopLevelNodes in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch InputFormatterExceptionPolicy in type MvcOptions is using compatibility value MalformedInputExceptions for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch SuppressBindingUndefinedValueToEnumType in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[0] Compatibility switch AllowAreas in type RazorPagesOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[0] Compatibility switch AllowMappingHeadRequestsToGetHandler in type RazorPagesOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcViewOptions[0] Compatibility switch SuppressTempDataAttributePrefix in type MvcViewOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.ModelBinding.ModelBinderFactory[12] 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[3] Hosting starting info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[0] 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[53] Repository contains no viable default key. Caller should generate a key with immediate activation. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider[57] Policy resolution states that a new key should be added to the key ring. info: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[58] Creating key {0fe5f8aa-0875-4612-83aa-59df0ed4f0c8} with creation date 2018-12-18 19:04:09Z, activation date 2018-12-18 19:04:09Z, and expiration date 2019-03-18 19:04:09Z. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[32] Descriptor deserializer type for key {0fe5f8aa-0875-4612-83aa-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[34] No key escrow sink found. Not writing key {0fe5f8aa-0875-4612-83aa-59df0ed4f0c8} to escrow. warn: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[35] No XML encryptor configured. Key {0fe5f8aa-0875-4612-83aa-59df0ed4f0c8} may be persisted to storage in unencrypted form. info: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[39] Writing data to file '/root/.aspnet/DataProtection-Keys/key-0fe5f8aa-0875-4612-83aa-59df0ed4f0c8.xml'. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[23] Key cache expiration token triggered by 'CreateNewKey' operation. dbug: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[37] Reading data from file '/root/.aspnet/DataProtection-Keys/key-0fe5f8aa-0875-4612-83aa-59df0ed4f0c8.xml'. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[18] Found key {0fe5f8aa-0875-4612-83aa-59df0ed4f0c8}. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.DefaultKeyResolver[13] Considering key {0fe5f8aa-0875-4612-83aa-59df0ed4f0c8} with expiration date 2019-03-18 19:04:09Z as default key. dbug: Microsoft.AspNetCore.DataProtection.TypeForwardingActivator[0] 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[11] Using managed symmetric algorithm 'System.Security.Cryptography.Aes'. dbug: Microsoft.AspNetCore.DataProtection.AuthenticatedEncryption.ManagedAuthenticatedEncryptorFactory[10] Using managed keyed hash algorithm 'System.Security.Cryptography.HMACSHA256'. dbug: Microsoft.AspNetCore.DataProtection.KeyManagement.KeyRingProvider[2] Using key {0fe5f8aa-0875-4612-83aa-59df0ed4f0c8} as the default key. dbug: Microsoft.AspNetCore.DataProtection.Internal.DataProtectionStartupFilter[0] Key ring with default key {0fe5f8aa-0875-4612-83aa-59df0ed4f0c8} was loaded during application startup. info: Walt.TestMcroServoces.Webapi.Startup[0] infomation dbug: Microsoft.AspNetCore.Mvc.MvcJsonOptions[0] Compatibility switch AllowInputFormatterExceptionMessages in type MvcJsonOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch AllowCombiningAuthorizeFilters in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch AllowBindingHeaderValuesToNonStringModelTypes in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch AllowValidatingTopLevelNodes in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch InputFormatterExceptionPolicy in type MvcOptions is using compatibility value MalformedInputExceptions for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcOptions[0] Compatibility switch SuppressBindingUndefinedValueToEnumType in type MvcOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[0] Compatibility switch AllowAreas in type RazorPagesOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.RazorPages.RazorPagesOptions[0] Compatibility switch AllowMappingHeadRequestsToGetHandler in type RazorPagesOptions is using compatibility value True for version Version_2_1 dbug: Microsoft.AspNetCore.Mvc.MvcViewOptions[0] 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。