docker - Log file not created in a .NET Core application running in a Docker container

Question

I run a ASP.NET Core application in a Docker container and I am using Serilog.Extensions.Logging.File to write logs to a file.

I am able to see the logs when running the app locally (not in a container), but I am not able to see the logs when I bash into the container.

I am new to containerization and I was wondering if I am missing any steps.

标签： dockerasp.net-core

Answer 1

Follow steps below to check the difference.

1. Configure Serilog like

       public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
           WebHost.CreateDefaultBuilder(args)
               .ConfigureLogging((hostingContext, builder) =>
               {
                   builder.AddFile("Logs/myapp-{Date}.txt");
               })
               .UseStartup<Startup>();
   

2. Build the image

   docker build -t dockersql .
   

3. Run the image

   docker run -it -p 9999:80 dockersql
   

4. Find the running container and exec the container

As the suggestion from @Chris, it is recommended to mount the volume, you could try like

    docker run -it -p 9999:80 -v D:\xx\TestDockerSQL\Test:/app/Logs dockersql