asp.net core 日志记录到elk

关于ELK的安装大家可以参考ubuntu18 docker中部署ELK 和 caas/docker-elk ，

首先需要在ELK中创建一个index patterns

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首先我们创建一个aspnetcore webapi项目

1.添加如下引用：

Serilog
Serilog.Sinks.ElasticSearch
Serilog.Extensions.Logging

2.修改appsettings.json文件：

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "AllowedHosts": "*",
  "ElasticConfiguration": {
    "Uri": "http://192.168.100.5:5000/"
  }
}

3.修改Startup.cs文件

  public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
             var elasticUri = Configuration["ElasticConfiguration:Uri"];
            Log.Logger = new LoggerConfiguration().Enrich.FromLogContext().MinimumLevel.Debug() .WriteTo.Elasticsearch(
                new ElasticsearchSinkOptions(new Uri(elasticUri)) { MinimumLogEventLevel=LogEventLevel.Information,AutoRegisterTemplate=true,  })
                .CreateLogger();
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddLogging(loggingBuilder => loggingBuilder.AddSerilog(dispose: true));
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        }

4.修改controller：

 ILogger<ValuesController> _logger;
        public ValuesController(ILogger<ValuesController> logger) {
            _logger = logger;
        }

        [HttpGet]
        public ActionResult<IEnumerable<string>> Get()
        {
            _logger.LogInformation($"oh hai there! : {DateTime.UtcNow}");
            try
            {
                throw new Exception("oops. i haz cause error in UR codez.");
            }
            catch (Exception ex)
            {
                _logger.LogCritical("ur app haz critical error", ex);
                _logger.LogError(ex, "ur code iz buggy.");
            }
            return new string[] { "value1", "value2" };
        }

5.运行项目然后在elk中验证

备注：网上关于elk的地址都是http://xxx:9200 （elasticsearch地址）, 我在测试的时候发现怎么都没有写入到elk，后来改为5000（Logstash的地址）就好了

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参考：

Logging with ElasticSearch, Kibana, ASP.NET Core and Docker

thecarlo/elastic-kibana-netcore-serilog