Asp.Net Core 项目中使用 Serilog 输出日志到 Elasticsearch

时间：2020-09-07 18:51:34 阅读：66 评论：0 收藏：0 [点我收藏+]

环境说明

　　服务器：CentOS 7，IP：172.17.79.83

　　开发环境：Win10 + VS2019

　　Docker 启动 Elasticsearch

docker run --name elasticsearch --restart always -d -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" elasticsearch:7.5.0

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　　Docker 启动 Kibana

docker run --name kibana --restart always -d --link elasticsearch:elasticsearch -p 5601:5601 kibana:7.5.0

技术图片

项目配置

　　创建一个 WebAPI 项目，添加 nuget 包 Serilog.AspNetCore（目前最新版本 3.4.0）、Serilog.Sinks.Elasticsearch（v8.2.0）、Serilog.Exceptions（v5.6.0）。

　　将默认的 appsettings.json 中的内容替换成一下内容。

{
  "Serilog": {
    "MinimumLevel": {
      "Default": "Information",
      "Override": {
        "Microsoft": "Information",
        "System": "Warning"
      }
    }
  },
  "ElasticConfiguration": {
    "Uri": "http://172.17.79.83:9200"
  },
  "AllowedHosts": "*"
}

　　Program.cs 中配置 Serilog

 1 using System;
 2 using System.Reflection;
 3 using Microsoft.AspNetCore.Hosting;
 4 using Microsoft.Extensions.Configuration;
 5 using Microsoft.Extensions.Hosting;
 6 using Serilog;
 7 using Serilog.Sinks.Elasticsearch;
 8 using Serilog.Exceptions;
 9 
10 namespace EFKlog
11 {
12     public class Program
13     {
14         private static readonly string env = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
15         public static void Main(string[] args)
16         {
17             ConfigureLogging();
18 
19             CreateHostBuilder(args).Build().Run();
20         }
21 
22         public static IHostBuilder CreateHostBuilder(string[] args) =>
23             Host.CreateDefaultBuilder(args)
24                 .ConfigureWebHostDefaults(webBuilder =>
25                 {
26                     webBuilder.UseStartup<Startup>()
27                     .ConfigureAppConfiguration(cfg=> 
28                     {
29                         cfg.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
30                         cfg.AddJsonFile($"appsettings.{env}.json", optional: true, reloadOnChange: true);
31                     })
32                     .UseSerilog();
33                 });
34 
35         private static void ConfigureLogging()
36         {
37             var cfg = new ConfigurationBuilder()
38                 .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
39                 .AddJsonFile($"appsettings.{env}.json", optional: true, reloadOnChange: true)
40                 .Build();
41             Log.Logger = new LoggerConfiguration()
42                 .Enrich.FromLogContext()
43                 .Enrich.WithExceptionDetails()
44                 .Enrich.WithProperty("Environment",env)
45                 .WriteTo.Debug()
46                 .WriteTo.Console()
47                 .WriteTo.Elasticsearch(ConfigureElasticSink(cfg, env))
48                 .ReadFrom.Configuration(cfg)
49                 .CreateLogger();
50         }
51 
52         private static ElasticsearchSinkOptions ConfigureElasticSink(IConfigurationRoot cfg,string env)
53         {
54             return new ElasticsearchSinkOptions(new Uri(cfg["ElasticConfiguration:Uri"]))
55             {
56                 AutoRegisterTemplate = true,
57                 IndexFormat = $"{Assembly.GetExecutingAssembly().GetName().Name.ToLower().Replace(".", "-")}-{env?.ToLower().Replace(".", "-")}-{DateTime.UtcNow:yyyy-MM}"
58             };
59         }
60     }
61 }

Program.cs

　　在 api 中记录日志。

public IEnumerable<WeatherForecast> Get()
        {
            _logger.LogInformation("WeatherForecast api executed at {date}",DateTime.UtcNow);
            try
            {
                throw new Exception("some bad code was executed...");
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "调用天气预报 api 出现错误！");
            }

            var rng = new Random();
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            })
            .ToArray();
        }