ElasticSearch+NLog实现.net core分布式日志管理

概述

Elasticsearch可广泛应用于日志分析、全文检索、结构化数据分析等多种场景，大幅度降低维护多套专用系统的成本，在开源社区非常受欢迎。在系统中，如果将日志作为文件输出，查看系统日志将非常不便；如果将日志保存到数据库中，又不能进行全文搜索。在这里我们将日志输出到ElasticSearch中，借助Kibana再查找日志。

实现方式

1、配置es服务地址

{"ConnectionStrings": {"ElasticSearchServerAddress": "http://localhost:9200"},"Logging": {"LogLevel": {"Default": "Warning"}},"AllowedHosts": "*"
}

2、配置nlog.config

<?xml version="1.0" encoding="utf-8" ?>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"internalLogToConsole="true"><extensions><add assembly="NLog.Targets.ElasticSearch"/></extensions><targets><!--ElasticSearch保存日志信息--><target name="ElasticSearch" xsi:type="ElasticSearch" ConnectionStringName="ElasticSearchServerAddress"index="userapi-${date:format=yyyy.MM.dd}" documentType="doc" includeAllProperties="true"layout="[${date:format=yyyy-MM-dd HH\:mm\:ss}][${level}] ${logger} ${message} ${exception:format=toString}"><field name="MachineName" layout="${machinename}" /><field name="Time" layout="${longdate}" /><field name="level" layout="${level:uppercase=true}" /><field name="logger" layout=" ${logger}" /><field name="message" layout=" ${message}" /><field name="exception" layout=" ${exception:format=toString}" /><field name="processid" layout=" ${processid}" /><field name="threadname" layout=" ${threadname}" /><field name="stacktrace" layout=" ${stacktrace}" /><field name="Properties" layout="${machinename} ${longdate} ${level:uppercase=true} ${logger} ${message} ${exception}|${processid}|${stacktrace}|${threadname}" /></target></targets><rules><logger name="*" minlevel="INFO" writeTo="ElasticSearch" /></rules>
</nlog>

3、测试写入日志

   // GET api/values[HttpGet]public ActionResult<IEnumerable<string>> Get(){var result = new string[] { "value1", "value2" };_logger.LogInformation(JsonConvert.SerializeObject(result));return result;}