App Service Stack settings are empty

[mattisax]

Bicep version

Bicep CLI version 0.4.1318 (ee0d808)

Describe the bug
Deploying resource 'Microsoft.Web/sites/config@2021-03-01' is not setting the app service Configuration -> General settings -> Stack settings. They are empty in the portal following deployment. I am setting netFrameworkVersion: 'v6.0. When I view the template for the app service that was created it also includes "phpVersion": "5.6". Looking at the template of another app service that was created via the portal, phpVersion is not in the template.

To Reproduce

resource appName_web 'Microsoft.Web/sites/config@2021-03-01' = {
  parent: webapp
  name: 'web'
  properties: {
    numberOfWorkers: 1
    defaultDocuments: [
      'Default.htm'
      'Default.html'
      'Default.asp'
      'index.htm'
      'index.html'
      'iisstart.htm'
      'default.aspx'
      'index.php'
      'hostingstart.html'
    ]
    netFrameworkVersion: 'v6.0'
    requestTracingEnabled: true
    requestTracingExpirationTime: '9999-12-31T23:59:00Z'
    remoteDebuggingEnabled: false
    remoteDebuggingVersion: 'VS2019'
    httpLoggingEnabled: false
    acrUseManagedIdentityCreds: false
    logsDirectorySizeLimit: 35
    detailedErrorLoggingEnabled: true
    publishingUsername: '$${appName}'
    scmType: 'VSTSRM'
    use32BitWorkerProcess: false
    webSocketsEnabled: false
    alwaysOn: true
    managedPipelineMode: 'Integrated'
    virtualApplications: [
      {
        virtualPath: '/'
        physicalPath: 'site\\wwwroot'
        preloadEnabled: true
      }
    ]
    loadBalancing: 'LeastRequests'
    experiments: {
      rampUpRules: []
    }
    autoHealEnabled: false
    vnetRouteAllEnabled: false
    vnetPrivatePortsCount: 0
    localMySqlEnabled: false
    ipSecurityRestrictions: [
      {
        ipAddress: 'Any'
        action: 'Allow'
        priority: 1
        name: 'Allow all'
        description: 'Allow all access'
      }
    ]
    scmIpSecurityRestrictions: [
      {
        ipAddress: 'Any'
        action: 'Allow'
        priority: 1
        name: 'Allow all'
        description: 'Allow all access'
      }
    ]
    scmIpSecurityRestrictionsUseMain: false
    http20Enabled: true
    minTlsVersion: '1.2'
    scmMinTlsVersion: '1.2'
    ftpsState: 'FtpsOnly'
    preWarmedInstanceCount: 0
    functionAppScaleLimit: 0
    healthCheckPath: '/'
    functionsRuntimeScaleMonitoringEnabled: false
    websiteTimeZone: 'Eastern Standard Time'
    minimumElasticInstanceCount: 1
    azureStorageAccounts: {}
  }

[brwilkinson]

if you review this doc it shows the php version can be listed ad updated as part of the linuxFxVersion

https://docs.microsoft.com/en-us/azure/app-service/configure-language-php?pivots=platform-linux#show-php-version

here is a sample template that shows how to pass this in

https://github.com/brwilkinson/AzureDeploymentFramework/blob/main/ADF/bicep/x.appService.bicep#L92

resource WS 'Microsoft.Web/sites@2021-01-01' = {
  name: '${Deployment}-${appprefix}${ws.Name}'
  identity: {
    type: 'SystemAssigned, UserAssigned'
    userAssignedIdentities: (contains(MSILookup, ws.NAME) ? userAssignedIdentities[MSILookup[ws.NAME]] : userAssignedIdentities.Default)
  }
  kind: ws.kind
  location: resourceGroup().location
  properties: {
    enabled: true
    httpsOnly: true
    serverFarmId: FARM.id
    siteConfig: {
      // az webapp list-runtimes, this setting is linux only
      linuxFxVersion: empty(linuxFxVersion) ? null : linuxFxVersion
    }
  }
  dependsOn: [
    WebSiteDNS
  ]
}

I call that from this other template since that is a module:

https://github.com/brwilkinson/AzureDeploymentFramework/blob/main/ADF/bicep/AppServiceContainer.bicep#L114

module container 'x.appService.bicep' = [for (ws, index) in WebSiteInfo: if (WSInfo[index].match) {
  name: 'dp${Deployment}-ws${ws.Name}'
  params: {
    ws: ws
    appprefix: 'ws'
    Deployment: Deployment
    DeploymentURI: DeploymentURI
    linuxFxVersion: 'COMPOSE|${WSInfo[index].compose}'

So try:

linuxFxVersion: 'PHP|8.0'

[brwilkinson]

hi @mattisax just a ping on this answer.

[mattisax]

@brwilkinson Sorry about delayed response. I just looked through your replies. I modified my template to include the following and I can report it solved my issue. Thanks for all your detailed responses!

netFrameworkVersion: 'v6.0' linuxFxVersion: null nodeVersion: 'OFF' phpVersion: 'OFF'

And then the key seems to be the stack information metadata in your last post:

resource stack 'Microsoft.Web/sites/config@2021-01-15' = {
  name: 'metadata'
  parent: WS
  properties: {
    CURRENT_STACK: ws.stack
  }
}

[brwilkinson]

Thanks @mattisax glad it's working for you. I will mark as answered.

[wedoazure]

Apologies I didn't ask if it was Windows or Linux ?

here is the Windows version:

https://docs.microsoft.com/en-us/azure/app-service/configure-language-php?pivots=platform-windows#show-php-version

Which are you using? I assume it's Windows based on: physicalPath: 'site\\wwwroot'

I'll take a look into it and provide an update after.

Thank you @brwilkinson this Windows element isn't documented like this anywhere else!

[alex-frankel]

@seligj95 / @naveedaz -- can we update Web App documentation to include this info?

[SeanLively]

I had a very similar issue: PHP 7.4 on Windows App Service, and I was unable to get the Stack set.
It appears that the key is LinuxFxVersion: null, and I've not seen that in any of the documentation.
Here's what worked for me:
siteConfig: { linuxFxVersion: null phpVersion: '7.4' nodeVersion: 'OFF' netFrameworkVersion: null }