why is my azure webjob not logging to the storage blob?

Question

I've configured app service logging for the app service to go to an azure blob storage.

My test code for the manually-triggered, .net core, test webjob is simple:

namespace TestWebJob
{
    class Program
    {
        static void Main(string[] args)
        {
            System.Diagnostics.Trace.TraceError("message using diagnostics");
        }
    }
}

I would expect to see the Trace logged to the storage blob; but instead my blob is empty after the job runs.

What am I doing wrong here?

Doris Lv Doris Lv · Accepted Answer · 2020-07-27T08:30:38

Update......

Sorry for the last answer. I get your point now.

The reason is that we didn't have a TraceListener in our code.

You could add this in your code:

Trace.Listeners.Add(new ConsoleTraceListener());

I found it from the second answer here: Azure WebJobs: Can't find Trace logging.

If it didn't work, check your runtime. You can see it is different adding logs in .NET or .NET Core from this article: https://docs.microsoft.com/en-us/azure/app-service/troubleshoot-diagnostic-logs#add-log-messages-in-code

enter image description here

--------------------------------------------------------Dividing line-------------------------------------------------------

I tried to deploy a WebJob using your code, and I found that maybe you should change the log's level in app service log settings to Verbose: enter image description here

You can see the details in different log's level in this page: enter image description here

When I set the logs level to Information and run the WebJob, there is nothing added in my blob. enter image description here

After I change the logs level to Verbose and run the WebJob, there are the information added. enter image description here

why is my azure webjob not logging to the storage blob?

1 Answers

Update......