Web App: Kudu Node Version is to low

Question

Web App: Kudu Node Version is to low

Max Renner 0

Hi,

we are useing an Azure Release Pipeline with the Task "AzureRmWebAppDeployment@5" on a Azure DevOps Premise. The task deploys our build App as ZipDeloyment to the Azure Web App with Linux as OS and Node 20 LTS (20.18.1) as Target Node Version.
B7cf7279e71ca4fc9ba2518329f255a2a638764651901384539_20250301-233309-grafik

The problem we are facing is that we want to use the post deployment action of the task to install the npm packages of our app but the builder aka "Kudu" has only the Node version 18.17.1 installed. The packages we use need a higher node version (on the kudu service).
Be9c171643c434ba29fc6c6adaaaf53dd638764642547921853_20250301-231734-grafik
B8410e223f1144b348c3e2fb390726b51638764647359024800_20250301-232535-grafik
Is there a flag or way to update the kudu node version?

The Node Version from the Web App is fine.
grafik

Everything i found was releaed to the web App Node Version which doesnt change the kudu node version. What I found:
WEBSITE_NODE_DEFAULT_VERSION
Used in the ENV Vars with value "20.18.1"
LINUX_FX_VERSION
That this env var is corretly set to my target Node-Version --> NODE|20-lts
And that the right build is used for the containter
grafik

The Wep App Configuration is set corretly
grafik

And the last thing that maybe be helpfull but also didnt effect the kudu node version was "WEBSITE_DISABLE_SCM_SEPARATION"
I tried 0, false, False, FALSE as value but nothing looked like a change, even after a new deloyment.
Always still the same older Node Version on the Kudu Service.

Prabhavathi Manchala 2,315 Reputation points Microsoft External Staff Moderator

2025-03-06T07:34:11.67+00:00

Hi Max Renner,

It appears that multiple attempts to update the Node.js version used by Kudu have not been successful.

The Kudu service operates independently of the Web App runtime. Although Azure App Service runs on a Linux container with Node.js 20.18.1 as configured, Kudu defaults to a lower version, typically Node.js 18.17.1 in this scenario.

You are using the post-deployment action to install npm packages, but Kudu is stuck on an older Node.js version. This discrepancy causes issues because your application requires Node.js 20.18.1.

You might have checked the NodeJs version via the debug console in the Bash section of the Azure web app. Please check the NodeJs version via the SSH console for the correct version.

Kindly refer this below link.

https://stackoverflow.com/questions/78483852/why-is-the-nodejs-version-on-kudu-different-from-my-app-version
Max Renner 0 Reputation points

2025-03-06T07:56:33.9433333+00:00

I know that there a two different version of node
As i sad the Node Version on the Web App is fine and at 20.18.1 like the screenshot above shows. The same with the Kudu Node version I know that it is 18.17.1 also shown in the screenshot above.

And I also know that the post deployment action is excuted with the kudu "runtime".
My question still stands, if there is a way for the user to upgrade the node version of the kudu envoirment somehow via flag or maually.
Prabhavathi Manchala 2,315 Reputation points Microsoft External Staff Moderator

2025-03-07T11:12:56.6233333+00:00

Hi Max Renner,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Laxman Reddy Revuri 5,395 Reputation points Microsoft External Staff Moderator

2025-03-11T12:17:03.0633333+00:00

Hi Max Renner,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

1 answer

Your answer

Prabhavathi Manchala 2,315 Reputation points Microsoft External Staff Moderator

2025-03-06T07:34:11.67+00:00

Hi Max Renner,

It appears that multiple attempts to update the Node.js version used by Kudu have not been successful.

The Kudu service operates independently of the Web App runtime. Although Azure App Service runs on a Linux container with Node.js 20.18.1 as configured, Kudu defaults to a lower version, typically Node.js 18.17.1 in this scenario.

You are using the post-deployment action to install npm packages, but Kudu is stuck on an older Node.js version. This discrepancy causes issues because your application requires Node.js 20.18.1.

You might have checked the NodeJs version via the debug console in the Bash section of the Azure web app. Please check the NodeJs version via the SSH console for the correct version.

Kindly refer this below link.

https://stackoverflow.com/questions/78483852/why-is-the-nodejs-version-on-kudu-different-from-my-app-version
Max Renner 0 Reputation points

2025-03-06T07:56:33.9433333+00:00

I know that there a two different version of node
As i sad the Node Version on the Web App is fine and at 20.18.1 like the screenshot above shows. The same with the Kudu Node version I know that it is 18.17.1 also shown in the screenshot above.

And I also know that the post deployment action is excuted with the kudu "runtime".
My question still stands, if there is a way for the user to upgrade the node version of the kudu envoirment somehow via flag or maually.
Prabhavathi Manchala 2,315 Reputation points Microsoft External Staff Moderator

2025-03-07T11:12:56.6233333+00:00

Hi Max Renner,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
Laxman Reddy Revuri 5,395 Reputation points Microsoft External Staff Moderator

2025-03-11T12:17:03.0633333+00:00

Hi Max Renner,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

Answer 1

Hi Max Renner,

At present, there is no direct method to upgrade the Node.js version of the Kudu environment either manually or via a flag. The Node.js version in Kudu is determined by the application settings in the Azure portal, specifically the WEBSITE_NODE_DEFAULT_VERSION setting.

Although you cannot directly alter the Kudu version, you can set the Node.js version for your application runtime using the engines field in package.json.

You can also set it Azure portal settings (under Application settings > WEBSITE_NODE_DEFAULT_VERSION), but it does not directly affect Kudu’s environment during post-deployment actions.

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Web App: Kudu Node Version is to low

1 answer

Your answer