Azure Web App Trace logs not appearing in log

Question

I am using Azure Web App Application Logging, and I followed the online tutorial, and made the following setup:

I get an exception and in my catch block I have the following code:

Trace.TraceError("abc");
Trace.TraceInformation("abc");
Trace.TraceWarning("abc");
Trace.WriteLine("abc");
Console.WriteLine("abc");

In the logs I get this:

2017-02-13 03:30:14 ~1ENGINEMAILERAPI GET /api/vfs/site/wwwroot/ _=1486950157594&X-ARR-LOG-ID=149fee3f-8da3-460e-816e-10e7a4b95f1d 443 - 121.121.23.217 Mozilla/5.0+(Windows+NT+6.3;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/56.0.2924.87+Safari/537.36 - https://web1.appsvcux.ext.azure.com/websites/WebsitesContent/WebsitesIndex?cacheability=3&defaultCloudName=azure&extensionName=WebsitesExtension&shellVersion=5.0.302.608%20(production%233ec7ddd.170201-1022)&traceStr=&region=southeastasia&flight=0&defaultCacheEvictionDelay=105000&websitesextension_enablemonitoringgroup=true&websitesextension_newauditlogs=true&websitesextension_resourcemenu=true&websitesextension_seetemplate=true&pageVersion=5.12.32.464175.170208-1137&l=en.en-us&trustedAuthority=portal.azure.com enginemailerapi.scm.azurewebsites.net 200 0 0 992 1923 62

How can I get my application logging to show up?

This error you got from FTP or Blob Storage? Also, please check the following doc page docs.microsoft.com/en-us/azure/app-service-web/… — Thiago Custodio
@ThiagoCustodio hi dear, i get it from the FTP , and i was totally follow it, may i know if i need to add any trace listener to it? — Ryan Shine
@Bruce-MSFTnope... i still unable to do it, it wasted too much of time... it probably i created web service myself, when i create a new project, i created as a empty website not azure website, probably this is the cause — Ryan Shine
Are you deploying to a particular deployment slot other than the default (production)? If so, make sure that you are enabling Diagnostic Logs and look in the Log Stream blades from the Deployment Slot blade itself. It happened to me. I enabled logging on the default when I was testing on my "staging" slot. Once I realized my mistake I went to App > Deployment Slots > staging > Diagnostic Logs and voila! logs started streaming right away. — Luis Artola

Bruce Chen Bruce Chen · Accepted Answer · 2017-02-14T02:48:34

According to the log format of error message you provided, I assumed that the log file you provided is belongs to Web Server Logs ( under /LogFiles/http/RawLogs) which formatted using W3W Logging. Based on your configuration, you have both enabled file system and blob storage for Application Logging. You could retrieve your application logs as follows:

Application Logging (Filesystem)

For a simple way, you could leverage KUDU, click "Debug console > CMD" and cd LogFiles\Application, then you could retrieve your logs as follows:

Application Logging (Blob)

You could leverage Microsoft Azure Storage Explorer to retrieve your logs as follows:

UPDATE：

Azure Web App Trace logs not appearing in log

1 Answers