CODEWITHSUNDEEP
azureazure-functions
RhomburVernius
RhomburVernius

Reputation: 2250

Azure function logging doesn't appear to be working

I'm able to successfully call my functions and make them do what I want them to do. The problem is that it doesn't look like the logs are being saved anywhere and I don't see how I can view them. Which I'll want to do in the event of an error. As a test I have my working function just doing a log.Info as soon as it's called. When testing locally it prints the message to the console. I believe I've enabled everything correctly but let me explain what I've done in case I didn't.

In my app service, under Monitoring -> Diagnostic Logs, I have enabled everything. Application Logging (filesystem) verbose, Application Logging (Blob) verbose (with the storage location set), detailed error messages and failed request tracing turned on.

In my function, I'm using the TraceWriter object that's passed to my run method (I started from a template).

Please note that functions are set to require authentication. If I click on the "Monitor" tab nothing appears. It just says "Loading..." forever and there's no information. Perhaps this is because of the authentication?

I used the Azure Storage Explorer to browse to my blob. The "log" blob exists, and I do see a set of nested directories that lead up to now. However it just contains a 354 byte file that contains a few lines of some random info. This file never seems to update or get larger.

I used FTP to try and browse to where the logs might be, but there's no directory on there that contains any log files.

I also went to KUDU for my function app ({myfunctionapp}.scm.azurewebsites.net/azurejobs/#/functions). While I do see that my function was called successfully, I don't see anything from the call to log.Info anywhere.

I tried using a different logger, and as a test did: System.Diagnostics.Trace.TraceError("test error");

I also don't see this message appearing anywhere.

Am I missing something as far as set up goes? Is the problem the fact that I require authentication? If it's the latter, is there still a way to view logs? I definitely have to have auth enabled. Thanks. And if it helps, below are links to what my settings and the monitor tab look like.

Settings: https://postimg.org/image/u57m2xbl5/ Monitor: https://postimg.org/image/uou10arch/

Upvotes: 3

Views: 5602

Answers (2)

David McSpadden
David McSpadden

Reputation: 449

Same thing happened to me if I had Fiddler open....close Fiddler and all is good.

Upvotes: 1

Matt Mason
Matt Mason

Reputation: 2726

Authentication should not cause any problems with logging and Log.Info should work out of the box, no setup required.

I highly recommend that you enable AlwaysOn for your dedicated function app. The long loading of the Monitor tab could be because your site is in a 'cold' state, where it takes longer to start up.

If you go to {myfunctionapp}.scm.azurewebsites.net/DebugConsole and navigate to LogFiles/Application/Functions do you see any expected logs there? Also, when you run a function from the portal do you see logs in the log window?

Upvotes: 2

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