Log Stream of App Service stopped working unexpectedly

Question

Log Stream of App Service stopped working unexpectedly

Mustafa Jamal 66

Hi,

I am working on my newly build application. When I uploaded on Azure and enabled to Azure WebApp Diagnostics initially it was showing all logs properly in Log Stream. BUT after publishing code again it stopped working although updated code had noting to do with logging. Please see the configuration below:

In Program.cs:

        public static IWebHostBuilder CreateWebHostBuilder(string[] args)  
        {  
            return WebHost.CreateDefaultBuilder(args)     
                .ConfigureLogging(logging =>  
                {  
  
                    logging.AddAzureWebAppDiagnostics();  
  
                })  
                .ConfigureServices(serviceCollection => serviceCollection  
                    .Configure<AzureFileLoggerOptions>(options =>  
                    {  
                        options.FileName = "azure-diagnostics-";  
                        options.FileSizeLimit = 50 * 1024;  
                        options.RetainedFileCountLimit = 5;  
                    })  
                    .Configure<AzureBlobLoggerOptions>(options =>  
                    {  
                        options.BlobName = "log.txt";  
                    }))  
                .UseStartup<Startup>();  
        }

In appsettings.json:

 "Logging": {  
    "LogLevel": {  
      "Default": "Debug"  
    }

In Azure App Service Settings:

In AppService Logs:

Strange thing is on same setting it was working and stopped working unexpectedly, I am unable to debug issues due to this. Please help.

Thanks,

Mustafa

Ryan Hill 30,266 Reputation points Microsoft Employee Moderator

2020-05-22T04:58:34.88+00:00

Hi @Anonymous ,

Do you reconnect to the log strem after the your app service restarts? Do you no longer see new entries in your log.txt or azure-diagnostics files?

Mustafa Jamal 66

Hello @Ryan Hill ,

Thanks for your reply. I have restarted app service but nothing appears. Just following blank response:

Please see code snippet how am I logging in my code. Lines like these for logging are in whole application BUT nothing appears in log.

 public OperationsController(ILogger<OperationsController> logger,  
            IConfiguration configuration)  
        {  
            this.mConfiguration = configuration;  
            this.mLogger = logger;  
        }  
  
...  
  
public MRSaasDbContext(IConfiguration configuration, ILogger logger)  
        {  
         ...  
                this.mLogger.Log(LogLevel.Information, "Tenant Detail table CreateIfNotExistsAsync: TRUE");  
        ...  
        }

Please let me know if further information is required.

Thanks,
Mustafa

Ryan Hill 30,266 Reputation points Microsoft Employee Moderator

2020-05-26T15:36:33.89+00:00

Hello @Anonymous ,

Is log.txt getting updated? I believe it should be in D:\home\LogFiles folder.
Mustafa Jamal 66 Reputation points

2020-05-27T09:35:13.563+00:00

Hi @Ryan Hill ,

Thanks for your reply. I checked but didn't found any log.txt file at that location please check snapshot below:

Please let me know if further information is required.

Thanks,
Mustafa
Ryan Hill 30,266 Reputation points Microsoft Employee Moderator

2020-06-05T20:56:22.95+00:00

Hi @Anonymous ,

Check inside the dated folder 759494_20_05_14_20_04_35. You can also check what's in the eventlog.xml to check for any errors. Let me know what you find.
Miller Meares 16 Reputation points

2020-07-14T18:23:09.133+00:00

@ryanchill @MustafaJamal-3089 Were you able to figure this out? I am experiencing the same issue.

Edit: To add to this, I was able to find the corresponding log file in my directory under Home/LogFiles/Application

However, the logs stopped being entered into that file as soon as the logs stopped going to the log stream. Any thoughts?

1 answer

Your answer

Ryan Hill 30,266 Reputation points Microsoft Employee Moderator

2020-05-22T04:58:34.88+00:00

Hi @Anonymous ,

Do you reconnect to the log strem after the your app service restarts? Do you no longer see new entries in your log.txt or azure-diagnostics files?
Mustafa Jamal 66 Reputation points

2020-05-22T17:47:04.307+00:00

Hello @Ryan Hill ,

Thanks for your reply. I have restarted app service but nothing appears. Just following blank response:

Please see code snippet how am I logging in my code. Lines like these for logging are in whole application BUT nothing appears in log.

public OperationsController(ILogger<OperationsController> logger, IConfiguration configuration) { this.mConfiguration = configuration; this.mLogger = logger; } ... public MRSaasDbContext(IConfiguration configuration, ILogger logger) { ... this.mLogger.Log(LogLevel.Information, "Tenant Detail table CreateIfNotExistsAsync: TRUE"); ... }

Please let me know if further information is required.

Thanks,
Mustafa
Ryan Hill 30,266 Reputation points Microsoft Employee Moderator

2020-05-26T15:36:33.89+00:00

Hello @Anonymous ,

Is log.txt getting updated? I believe it should be in D:\home\LogFiles folder.
Mustafa Jamal 66 Reputation points

2020-05-27T09:35:13.563+00:00

Hi @Ryan Hill ,

Thanks for your reply. I checked but didn't found any log.txt file at that location please check snapshot below:

Please let me know if further information is required.

Thanks,
Mustafa
Ryan Hill 30,266 Reputation points Microsoft Employee Moderator

2020-06-05T20:56:22.95+00:00

Hi @Anonymous ,

Check inside the dated folder 759494_20_05_14_20_04_35. You can also check what's in the eventlog.xml to check for any errors. Let me know what you find.
Miller Meares 16 Reputation points

2020-07-14T18:23:09.133+00:00

@ryanchill @MustafaJamal-3089 Were you able to figure this out? I am experiencing the same issue.

Edit: To add to this, I was able to find the corresponding log file in my directory under Home/LogFiles/Application

However, the logs stopped being entered into that file as soon as the logs stopped going to the log stream. Any thoughts?

Answer 1

Miller Meares 16

I experienced this problem! It took me a while to figure it out, but I finally did. I deleted my old log file that was in Home/LogFiles/Application. and then it started working! I'm assuming it was some storage issue.

Along the way, I also updated the AzureAppServices package manager and uninstalled and reeinstalled the ASP.NET Core Logging Integration extension in Azure. I don't think those contributed, but they could have.

Ravikumar Tamilarasu 1 Reputation point

2022-04-04T15:37:48.637+00:00

You are right, after deleting the log file it worked for me too...
MichaelH 0 Reputation points

2023-06-02T19:57:56.8933333+00:00

Thanks, that did it for me, too. I need to look into a better log-quota / log-offload setup I think.

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Log Stream of App Service stopped working unexpectedly

1 answer

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