Serilog not writing to file on Ubuntu

Question

I have deployed a website to a ubuntu machine but unable to get serilog to write to file

Here is what I have:

In Program.cs (omitted unnecessary parts):

 public static void Main(string[] args)
    {
        var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
        var configuration = new ConfigurationBuilder()
             .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
             .AddJsonFile($"appsettings.{environment}.json", optional: true)
             .AddEnvironmentVariables()
             .Build();

        Log.Logger = new LoggerConfiguration()
            .ReadFrom.Configuration(configuration)
            .CreateLogger();

Also:

return Host.CreateDefaultBuilder(args)
            
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder

                .UseUrls($"http://localhost:{port}")
                .UseStartup<Startup>();
            })
            .UseSerilog();

in my appsetting.PreProduction.json:

"Serilog": {
"MinimumLevel": "Information",
"WriteTo": [
  {
    "Name": "File",
    "Args": {
      "path": "/var/log/myapp/",
      "rollingInterval": "Day"
    }
  }
]

},

This works on my local machine Windows

 {
    "Name": "File",
    "Args": {
      "path": "c:\\myapp\\log.txt",
      "rollingInterval": "Day"
    }
  },

Do I need to do anything extra permission wise?

Answer 1

I had to restart the service:

sudo systemctl restart myapp.service

also had to set permissions:

mkdir /var/log/myapp/
chown apiuser:apiuser /var/log/myapp/
chmod 740 /var/log/myapp

I kept restarting nginx but didn't know I had to restart the service too