My team has multiple Azure WebApps (Windows) running Node.js applications. We are using the Winston library to log service activity (e.g., requests). We have configured our Diagnostic Logging in each to store logs in Blob storage resources.
Using the Microsoft Azure Storage Explorer, we can see that there are multiple containers within Blob storage. It seems to be collecting information by the hour, but only 'snapshot' entries as CSV files and .log files with virtually no information. The files are small, which shouldn't be the case because traffic is consistent and we are logging a fair amount.
Our logging works in the filesystem format, but it's clearly not working in blob storage. We cannot seem to find a reason why our logs are not getting stored in our storage accounts.
Is there additional configuration necessary?
According to your description, I checked your issue and found that I could only get the logging via console.log and console.error from the KUDU path D:\home\LogFiles\Application\. Then I found a blog mentioned about application logs for node.js on azure web app as follows:
Setting application logs in the Azure portal
For node.js websites the way to write application logs is by writing to the console using console.log('message') and console.error('message') which goes to Information/Error level log entries. Currently the only supported target for the log files for node.js is the file system.
Other web site types like php and python are not supported for the application logs feature.
Here is a Azure blob storage adapter for popular nodejs logger, e.g. winston: winston-azure-blob-transport, you could leverage it for a workaround to collect the application logs from your node.js website into azure blob storage.
Related
I would like to configure my diagnostic logs to be redirected to Blob or Table Storage. However the only option I see is Filesystem:
My goal is to collect these logs in splunk
Currently only .NET application logs can be written to the blob storage. Java, PHP, Node.js, Python application logs can only be stored on the file system (without code modifications to write logs to external storage). I'd recommend checking the documentation here
According to this, redirecting to blob storage is only supported for Windows app service plans. Your one appears to be Linux.
nodejs apps on azure can log stdout and stderr to the file system (d:\home\logiles\Application)
The file system logs are automatically disabled after ~ 12 hours
Logging to blog would be a good alternative
According to the docs, it is still not supported for nodejs apps
Just wanted to know if that still holds true. I tried to turn ob blob logging in the portal: app => monitoring => diagnostics logs.
azure correctly creates folders (named after my app) in my blob container, but contain rather empty csv-files only.
Thanks a lot
Yes, the doc is right, Log to blob storage for nodejs is still not supported as of now.
As a workaround, you can take a look at winston-azure-blob-transport.
Hope it helps.
I've been asked to change an old Azure Cloud Service worker's logging to the System.Diagnostics.Trace logging style of logging. I've done that and now I'm about ready to deploy it to azure.
The client requirement is that these logs should appear in blob storage, similar to how the more modern app service logs can be configured to write their diagnostics to blob storage. There is an expectation that logs can be batched up and uploaded periodically (perhaps time or number of lines based).
Is there a nuget package or other library or config I should enable to connect the application to blob storage? I've spent about 20 mins searching here and online for a solution, but information seems to mainly talk about writing logs to Table Storage..
Edit: More detail:
This is an existing app (C# .Net Framework 4.5) that used to use an external logging service.
I assumed (incorrectly, I think) that the logging to blob storage was something I could configure in the Azure Portal.
As things are right now, NO log file of any kind is generated, but when I run the code in Visual Studio, I can see some Output from the logging statements
I have updated the code to use a standard (custom) logging system
that eventually boils down to using statements like the below:
Trace.TraceInformation($"DEBUG: {message}");
Here are some links I found with related information:
Streaming from command line
Trace listener question
Adding Trace to existing website
Performance Impact of Logging
Smarx Library
The logging is configured by the diagnostics.wadcfgx file which you can see in your solution.
This holds all of the diagnostic information that you want to collect. This can be controlled via the "Properties" of the Web\Worker role (right-click -> Properties).
From there, there is also the option to specify the Storage Account:
This isn't always ideal if you are deploying to multiple environments, so you should be able to alter the configuration from the Azure Portal, by downloading and uploading new configuration, following these instructions.
So logging to blob storage, think of it as uploading existing files to the blob storage. If your current app creates files, then you should use put blob property or blob append to add these files to blob storage. So you must interact with the storage SDK to make these transactions. You could also leverage logic apps which uses connectors to blob storage, and would perform certain actions based on specific triggers(time stamp and other conditions).
If you would like to see the generated logs in Azure Storage, you'll have to enable azure diagnostics but these logs would pertain to the storage account itself, not your app.
Since you mentioned that you see the output, you have to transfer that output as an object ex: (text file), then upload it to the storage account. You can find SDK information for C# here. I hope this helps.
I have deployed a node application as azure app service. And enabled azure Application Logging(blob) with log level "Verbose" and linked a storage account of type blob. But my node.js console.log and console.error do not appear in the blob. I still keep on getting stdout and stderr file in file system logging.
My iisnode.yml file has the following content-
nodeProcessCommandLine: "D:\Program Files (x86)\nodejs\6.3.0\node.exe"
nodeProcessCountPerApplication: 2
loggingEnabled: true
logDirectory: iisnode
maxLogFiles: 100
devErrorsEnabled: true
configOverrides: "iisnode.yml"
asyncCompletionThreadCount: 20
flushResponse: true
I'm trying to do the exact same thing right now and came across this:
For node.js websites the way to write application logs is by writing to the console using console.log('message') and console.error('message') which goes to Information/Error level log entries. Currently the only supported target for the log files for node.js is the file system.
It looks as though you can't use blob storage for application logs in Azure Web Apps. There are however Azure blob storage adapters for popular nodejs loggers such as winston:
winston-azure-blob-transport
I have some VMs running on Azure Service. I'd like to redirect logs from them (Windows Event Logs and MS SQL server logs) to a specific log concentrator (like Graylog). For Windows logs, I'm using Nxlog (https://nxlog.co/docs/nxlog-ce/nxlog-reference-manual.html#quickstart_windows). However, for specific (PaaS) applications such as SQL Server (PaaS in general) Nxlog does not apply.
Is there a way to redirect logs (VMs and PaaS) just using Azure (web) tools?
Most services keep their logs in a Storage Account so you can tap into that source and forward logs to your own centralized log database. You generally define the storage account at the place you enable diagnostics for the service.
Don't know what king of logs you are looking for in SQL DB, but for example the audit logs are saved in a storage account.
Azure Operations Management Suite (OMS) can ingest from dozens of services as well as custom logs. As itaysk mentioned, most services in Azure write service related diagnostic information to a storage account. It's really easy to ingest these from within OMS.
https://azure.microsoft.com/en-us/services/log-analytics/
For Azure Web Sites, you can use Application Insights and store custom metrics as well. There's also an option to continuously write these metrics to a storage account.
Here's a similar option for Azure SQL:
https://azure.microsoft.com/en-us/documentation/articles/sql-database-auditing-get-started/