ForgeFusion on Azure App service for Linux - Troubleshooting

•    Error Message: `ERROR - Container forgefusion-backend for site forgefusion-server has exited, failing site start`
•    This indicates that the container running your application is exiting unexpectedly.

•    Error Message: `ERROR - Container forgefusion-backend didn't respond to HTTP pings on port: 8080, failing site start`
•    The container isn't responding to health checks, which typically indicates that the application inside the container isn't starting correctly or listening on the expected port.

•    Error Message: `dotnet "ForgeFusionBackend.dll" aborted (core dumped)`
•    This suggests that there is a runtime error in your .NET application causing it to crash.

•    Error Number: 208, State: 1, Class: 16
•    This typically indicates that there is an issue with your SQL queries, such as referencing a non-existent table.

Steps to Debug and Resolve

•    Ensure that your application is configured correctly to listen on the correct port (8080 in this case).
•    Verify that there are no unhandled exceptions in your code, especially around the startup logic. Use logging to trace the startup sequence and identify where it fails.

•    The SQL Error 208 indicates an issue with your database schema. Double-check that all referenced tables and procedures exist and are correctly named.
•    Ensure that your application has the necessary permissions to access the database.

•    Review the detailed logs from the container to identify any specific errors. You can access these logs via the URLs provided in your logs (e.g., `/home/LogFiles/2024_05_25_ln0xsdlwk0001Y3_default_docker.log`).

•    Run your application locally in a containerized environment to replicate the issue. This can help isolate whether the problem is with the Azure environment or your application.

•    Ensure your Azure App Service settings are correct, including environment variables, app settings, and connection strings.

•    Implement application-level health checks to ensure your application responds correctly to pings. This can involve adding a health check endpoint in your application.

•    Verify all dependencies are correctly installed and compatible with your application. This includes any required libraries and runtime versions.

Example Code Check

public static void Main(string[] args)
  {
      CreateHostBuilder(args).Build().Run();
  }

  public static IHostBuilder CreateHostBuilder(string[] args) =>
      Host.CreateDefaultBuilder(args)
          .ConfigureWebHostDefaults(webBuilder =>
          {
              webBuilder.UseStartup<Startup>();
          });

public class Startup
  {
      public void ConfigureServices(IServiceCollection services)
      {
          services.AddControllersWithViews();
          // Add other necessary services
      }

      public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
      {
          if (env.IsDevelopment())
          {
              app.UseDeveloperExceptionPage();
          }
          else
          {
              app.UseExceptionHandler("/Home/Error");
              app.UseHsts();
          }

          app.UseHttpsRedirection();
          app.UseStaticFiles();
          app.UseRouting();
          app.UseAuthorization();
          app.UseEndpoints(endpoints =>
          {
              endpoints.MapControllerRoute(
                  name: "default",
                  pattern: "{controller=Home}/{action=Index}/{id?}");
          });
      }
  }