How Do I Set The Node Version In An Azure Web App?

Question

I have created an Azure Web App using terraform but it has the wrong version of NodeJS in it.

resource "azurerm_app_service_plan" "app-plan" {
  name                = "${var.prefix}-app-plan"
  resource_group_name = var.resource_group_name
  location            = var.resource_group_location

  sku {
    tier = "Free"
    size = "F1"
  }
}

#azurerm_app_service doesn't support creating Node.JS 8.10 apps
#https://github.com/terraform-providers/terraform-provider-azurerm/issues/4144
resource "azurerm_app_service" "app-service" {
  name                = "${var.prefix}-app"
  resource_group_name = var.resource_group_name
  location            = var.resource_group_location
  app_service_plan_id = azurerm_app_service_plan.app-plan.id
}

I have tried updating the configuration using the rest api

{
  "properties": {
    "nodeVersion": "8.10"
  }
}

and also updating the application settings using the rest api

{
  "properties": {
    "WEBSITE_NODE_DEFAULT_VERSION": "8.10"
  }
}

However, when I run the Console it still says node --version v0.10.40

When I run env it looks like the PATH variable is incorrect.

Node 8.10 does exist on the machine at D:\Program Files (x86)\nodejs\8.10.0

How can I update the path from the rest api?

Are there any alternatives?

My preferences are terraform > az cl > rest api

Note: Bear in mind that when I create the web app in the portal, selecting Node 8.10 forces me to choose Windows as the O/S.

Answer 1

In the portal it specifies Node 8.10 as a Runtime stack.

The az cli specifies 8.10 as a runtime:

az webapp list-runtimes|grep "8.10"
"node|8.10",

However, as you can see in the question, the version installed is 8.10.0.

If we set this in the application settings with terraform this (unintuitively) sets the correct node version:

resource "azurerm_app_service" "app-service" {
  name                = "${var.prefix}-app"
  resource_group_name = var.resource_group_name
  location            = var.resource_group_location
  app_service_plan_id = azurerm_app_service_plan.app-plan.id

  app_settings = {
    #The portal and az cli list "8.10" as the supported version.
    #"8.10" doesn't work here!
    #"8.10.0" is the version installed in D:\Program Files (x86)\nodejs
    "WEBSITE_NODE_DEFAULT_VERSION" = "8.10.0"
  }
}