Azure web app code not reflecting after changing via Kudu until restart

Question

Azure web app code not reflecting after changing via Kudu until restart

Joshua-3609 0

It seems that the issue isn't affecting all Azure App Services. Recently, I've noticed that none of the Azure App Services I'm utilizing are reflecting the code changes I've made via Kudu in the live application. I've attempted to modify the cache and other settings to resolve this, but to no avail. Here are the details of the environment I'm currently using.

Environment (Window Azure App Service)

Build 100.50921.6442.0 (Commit: e35b28e7cb)
Azure App Service 101.0.7.280
Site folder C:\home
Temp folder C:\local\Temp\

SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-08T10:29:03.25+00:00
@Joshua-3609 Thanks for reaching here! It seems like you are experiencing an issue where the changes you made via Kudu are not being reflected in the live application. One possible reason for this issue could be that the Local Cache feature is enabled on your Azure App Service.

Two important settings in Azure WebApps(AppService) that you definitely should care about are WEBSITE_DYNAMIC_CACHE and WEBSITE_LOCAL_CACHE_OPTION.

Being careless with them can lead to either website updating problems or unnecessary performance degradation. If you haven't added them, they will by default be WEBSITE_DYNAMIC_CACHE=1 and WEBSITE_LOCAL_CACHE_OPTION=Never.

When Local Cache is enabled, the app may not reflect the changes made via Kudu until the app is restarted.

To resolve this issue, you can try disabling the Local Cache feature on your Azure App Service. You can do this by following these steps:

Go to the Azure portal and navigate to your App Service.

In the left-hand menu, click on "Configuration".

Scroll down to the "Application settings" section and click on "Add new setting".

In the "Name" field, enter "WEBSITE_LOCAL_CACHE_OPTION" (without the quotes).

In the "Value" field, enter "Never" (without the quotes).

Similarly add WEBSITE_DYNAMIC_CACHE =1

Click "OK" to save the new setting.

Restart your app service.

After disabling the Local Cache feature, your app should reflect the changes made via Kudu without requiring a restart.

If this does not resolve your issue, please let me know.

For more details see https://github.com/projectkudu/kudu/wiki/Understanding-the-Azure-App-Service-file-system

https://github.com/projectkudu/kudu/wiki/Configurable-settings#turning-on-the-dynamic-cache-feature
Joshua-3609 0 Reputation points

2023-11-08T17:09:19.73+00:00

Hi Sneha Agrawal,
I've never modified the cache settings before, and I've set them up as mentioned, but the changes still aren't taking effect.
SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-09T10:49:09.4233333+00:00

@Joshua-3609 thanks for reply!

There is possibility that you are running into a file lock issue. To avoid this scenario, we would suggest stopping your web app, deploying the new site files, and then resuming the site.

In file lock scenarios, some of the files that are being shared across multiple instances might get locked, causing only one instance to receive the new files.

If stopping your production site is an issue, we would suggest setting up a staging slot for your site. You can stop the staging slot, deploy the site files, start the staging slot back up, verify the site contents and then swap the staging slot with the production slot. This would be one way to reduce impact.

As another workaround, you could look into the following steps to take the site offline automatically as part of your deployment model.
SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-10T16:50:41.46+00:00

@Joshua-3609 Just checking if you have chance to see recent response.

Please let us know if further query or issue remains.
Joshua-3609 0 Reputation points

2023-11-10T22:47:17.1266667+00:00

App services operating in West US 2 location have the same issue, but other locations such as west us, west us3, etc. operate normally.
Joshua-3609 0 Reputation points

2023-11-16T01:23:48.46+00:00

Here is additional information

App Service - Java Web App
Location: West US 2
Operating System:Windows

Technical Information

catalina.base: C:\Program Files\apache-tomcat-9.0.71
java.version: 11.0.16.1
java.home: C:\Program Files\Java\microsoft-jdk-11.0.16.1
SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-20T08:54:36.5833333+00:00

@Joshua-3609 Let us know if issue remains.

SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-08T10:29:03.25+00:00

@Joshua-3609 Thanks for reaching here! It seems like you are experiencing an issue where the changes you made via Kudu are not being reflected in the live application. One possible reason for this issue could be that the Local Cache feature is enabled on your Azure App Service.

Two important settings in Azure WebApps(AppService) that you definitely should care about are WEBSITE_DYNAMIC_CACHE and WEBSITE_LOCAL_CACHE_OPTION.

Being careless with them can lead to either website updating problems or unnecessary performance degradation. If you haven't added them, they will by default be WEBSITE_DYNAMIC_CACHE=1 and WEBSITE_LOCAL_CACHE_OPTION=Never.

When Local Cache is enabled, the app may not reflect the changes made via Kudu until the app is restarted.

To resolve this issue, you can try disabling the Local Cache feature on your Azure App Service. You can do this by following these steps:

Go to the Azure portal and navigate to your App Service.

In the left-hand menu, click on "Configuration".

Scroll down to the "Application settings" section and click on "Add new setting".

In the "Name" field, enter "WEBSITE_LOCAL_CACHE_OPTION" (without the quotes).

In the "Value" field, enter "Never" (without the quotes).

Similarly add WEBSITE_DYNAMIC_CACHE =1

Click "OK" to save the new setting.

Restart your app service.

After disabling the Local Cache feature, your app should reflect the changes made via Kudu without requiring a restart.

If this does not resolve your issue, please let me know.

For more details see https://github.com/projectkudu/kudu/wiki/Understanding-the-Azure-App-Service-file-system

https://github.com/projectkudu/kudu/wiki/Configurable-settings#turning-on-the-dynamic-cache-feature
Joshua-3609 0 Reputation points

2023-11-08T17:09:19.73+00:00

Hi Sneha Agrawal,
I've never modified the cache settings before, and I've set them up as mentioned, but the changes still aren't taking effect.
SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-09T10:49:09.4233333+00:00

@Joshua-3609 thanks for reply!

There is possibility that you are running into a file lock issue. To avoid this scenario, we would suggest stopping your web app, deploying the new site files, and then resuming the site.

In file lock scenarios, some of the files that are being shared across multiple instances might get locked, causing only one instance to receive the new files.

If stopping your production site is an issue, we would suggest setting up a staging slot for your site. You can stop the staging slot, deploy the site files, start the staging slot back up, verify the site contents and then swap the staging slot with the production slot. This would be one way to reduce impact.

As another workaround, you could look into the following steps to take the site offline automatically as part of your deployment model.
SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-10T16:50:41.46+00:00

@Joshua-3609 Just checking if you have chance to see recent response.

Please let us know if further query or issue remains.
Joshua-3609 0 Reputation points

2023-11-10T22:47:17.1266667+00:00

App services operating in West US 2 location have the same issue, but other locations such as west us, west us3, etc. operate normally.
Joshua-3609 0 Reputation points

2023-11-16T01:23:48.46+00:00

Here is additional information

App Service - Java Web App
Location: West US 2
Operating System:Windows

Technical Information

catalina.base: C:\Program Files\apache-tomcat-9.0.71
java.version: 11.0.16.1
java.home: C:\Program Files\Java\microsoft-jdk-11.0.16.1
SnehaAgrawal-MSFT 16,026 Reputation points Microsoft Employee

2023-11-20T08:54:36.5833333+00:00

@Joshua-3609 Let us know if issue remains.

Answer 1

@Joshua-3609 Thanks for sharing details, after internal discussion on this it came out that, it is required to restart the site to pick up changes, specially if those are manually added.

If you use any of the publishing methods such as Maven or CLI (OneDeploy command: az webapp deploy …), we will schedule the restart after copying the files.

Hope this helps, Let us know.

Azure web app code not reflecting after changing via Kudu until restart

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