How to see logs written using Console.WriteLine() in an azure function (in process) in azure portal?

Question

How to see logs written using Console.WriteLine() in an azure function (in process) in azure portal?

Varkeychan Jacob 25

I have an azure function (in process runtime) and I'd like to print some logs using Console.WriteLine(). I can see these logs when run locally, but how to see them in the azure portal?

MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator

2024-01-29T14:34:39.6066667+00:00

Varkeychan Jacob Just a follow up to see if you have any questions on the info shared below. Feel free to reach out for any questions and we are happy to answer.

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MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator

2024-01-29T14:34:39.6066667+00:00

Varkeychan Jacob Just a follow up to see if you have any questions on the info shared below. Feel free to reach out for any questions and we are happy to answer.

Answer 1

MuthuKumaranMurugaachari-MSFT 22,441 Moderator

Varkeychan Jacob Thanks for posting your question in Microsoft Q&A. As described in doc: Logging, Console.Write doesn't get captured in App Insights/Log Stream. The suggested way is to use ILogger dependency injection to write the logs like below: User's image

With ILogger, the logs are logged into App Insights, and we can be viewed via Monitor Tab or Log Stream and make sure you have set log levels. I saw you posted this question in https://github.com/Azure/azure-functions-host/issues/9828 (similar discussion in reddit) and if you face any issues in using ILogger, let me know with the details.

I hope this helps and feel free to reach out for any questions.

If you found the answer to your question helpful, please take a moment to mark it as Yes for others to benefit from your experience. Or simply add a comment tagging me and would be happy to answer your questions.

Varkeychan Jacob 25 Reputation points

2024-01-29T20:13:03.1666667+00:00

Thanks, that solves it
MuthuKumaranMurugaachari-MSFT 22,441 Reputation points Moderator

2024-01-29T20:31:31.0833333+00:00

Happy to help!
Tambur, Mihail (extern) 0 Reputation points

2024-11-04T14:34:28.2366667+00:00

Hi we have a similar case we are logging with a Serilog Logger into a third party system not App Insights, but when the error occurs before the Logger is initialized or when the third party system is not available we see no error and cannot find out why.

It would be helpful if we could at least see the errors logged with Console.Writeline in the console and be seen in the portal under Advanced Tools > Log Stream

Answer 2

Vahid Ghafarpour 23,385 Volunteer Moderator

Thanks for posting your question in the Microsoft Q&A forum. To view the logs your Azure Function generates, you can use the Log Stream feature in the Azure portal. https://learn.microsoft.com/en-us/azure/container-apps/log-streaming?tabs=bash ** Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful **

Varkeychan Jacob 25 Reputation points

2024-01-24T05:13:21.9733333+00:00

but that doesnt show output from console.writeline()

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How to see logs written using Console.WriteLine() in an azure function (in process) in azure portal?

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