Logging into relative path

01. Program.cs

using System;
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Serilog;

namespace WebApplication1
{
    public class Program
    {
        public static int Main()
        {
            try
            {
                new WebHostBuilder()
                    .UseIISIntegration()
                    .UseKestrel()
                    .UseContentRoot(Directory.GetCurrentDirectory())
                    .UseWebRoot(Path.Combine(Directory.GetCurrentDirectory(), "wwwroot"))
                    .ConfigureAppConfiguration((x, builder) => builder
                        .SetBasePath(x.HostingEnvironment.ContentRootPath)
                        .AddYamlFile("appsettings.yaml", false, true))
                    .UseStartup<Startup>()
                    .UseDefaultServiceProvider((context, options) => options.ValidateScopes = context.HostingEnvironment.IsDevelopment())
                    .UseSerilog((context, configuration) => configuration.ReadFrom.Configuration(context.Configuration))
                    .Build()
                    .Run();
                return 0;
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Host terminated unexpectedly");
                Console.WriteLine(ex);
                return 1;
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }
    }
}

02. Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Serilog;

namespace WebApplication1
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
            Log.Logger.Fatal("123");
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseMvc();
        }
    }
}

03. Project.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

<PropertyGroup>
    <TargetFrameworks>netcoreapp2.2</TargetFrameworks>
    <TargetLatestRuntimePatch>true</TargetLatestRuntimePatch>
    <LangVersion>latest</LangVersion>
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
    <WarningLevel>4</WarningLevel>
</PropertyGroup>

<ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.HttpsPolicy" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.2.0" />
    <PackageReference Include="NetEscapades.Configuration.Yaml" Version="1.6.0" />
    <PackageReference Include="Serilog" Version="2.8.0" />
    <PackageReference Include="Serilog.AspNetCore" Version="2.1.1" />
    <PackageReference Include="Serilog.Enrichers.Environment" Version="2.1.2" />
    <PackageReference Include="Serilog.Settings.Configuration" Version="3.0.1" />
    <PackageReference Include="Serilog.Sinks.RollingFile" Version="3.3.0" />
</ItemGroup>

</Project>

04. appsettings.yaml

Serilog:
  Using:
    - Serilog.Sinks.RollingFile
  WriteTo:
    - Name: RollingFile
      Args:
        pathFormat: 234.txt