Enable file logging on IIS for serilog - iis

Question

I want to enable file logging on IIS to resolve an issue locally on IIS. Following is the code I am using. It works when I run on visual studio and logs to a file but not when I deployed to IIS. Folder has enough permission to create a file and also I created the folder and file. What am I missing here ?
Program.cs
var path = #"C:\workspace\Logs\Log-{Date}.txt";
Log.Logger = new LoggerConfiguration()
.MinimumLevel.Verbose()
.MinimumLevel.Override("Microsoft", LogEventLevel.Information)
.Enrich.FromLogContext()
.WriteTo.Console(
outputTemplate:
"[{Timestamp:HH:mm:ss} {Level}] {SourceContext}{NewLine}{Message:lj}{NewLine}{Exception}{NewLine}",
theme: AnsiConsoleTheme.Literate)
.WriteTo.File(path, fileSizeLimitBytes: 1_000_000,
rollOnFileSizeLimit: true,
shared: true,
flushToDiskInterval: TimeSpan.FromSeconds(1))
.CreateLogger();
enable useSerialLog()
public static IWebHost BuildWebHost(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.ConfigureServices(services => services.AddAutofac())
.UseStartup<Startup>()
.UseSerilog()
.Build();

Answer 1

Serilog works perfectly on local. For IIS the log file folder need IIS User Permission.
public Startup(IHostingEnvironment env)
{
Log.Logger = new LoggerConfiguration()
.MinimumLevel
.Information()
.WriteTo.RollingFile(#"C:\inetpub\serilog\agilogoservicelogs\{Date}.txt", LogEventLevel.Information)
.WriteTo.Seq("http://localhost:5341")
.CreateLogger();
var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();
Configuration = builder.Build();
}
Update your controller :
public class ValuesController : Controller
{
private readonly ILogger<ScrumUserController> _logger;
public ValuesController(ILogger<ScrumUserController> logger)
{
_logger = logger;
}
[HttpGet]
public IEnumerable<string> Get()
{
_logger.LogInformation("Agilibo Service start running");
return new string[] { "Agilibo Core", "Service" };
}
}
Now give folder permission on deployed IIS.

Answer 2

If you use .net core ,because default application pool identity:
ApplicationPoolIdentity has no write permission.
You should:
Change application pool user to Local System...
Or-
Give ApplicationPoolIdentity write permission:
ApplicationPoolIdentity is a virtual name , you can use "IIS AppPool\DefaultAppPool" set the permission.
you can use cli do the same work
ICACLS C:\sites\MyWebApp /grant "IIS AppPool\DefaultAppPool":F
Don't forget restart applicationpool and site.
From Microsoft Docs