CODEWITHSUNDEEP
jsonazuredeploymentazure-rm-template
Antony Gibbs
Antony Gibbs

Reputation: 3480

Passing the output from one arm deployment resource linked template to another

I am using a series of json ARM templates to deploy Azure VMs, and am having issues passing information from one resource deployment to another.

I deploy two resources using linked templates from blob storage, one which in and of itself deploys nothing, but returns an object populated with configuration settings, and a second which then passes that output of configuration settings to another template as a parameter:

  "resources": [
    {
      "name": "[concat(deployment().name, '-config')]",
      "type": "Microsoft.Resources/deployments",
      "apiVersion": "2016-09-01",
      "properties": {
        "mode": "Incremental",
        "templateLink": {
          "uri": "[variables('configurationTemplate')]",
          "contentVersion": "1.0.0.0"
        },
        "parameters": {
          "subscriptionParameters": { "value": "[variables('subscriptionParameters')]" }
        }
      }
    },
    {
      "name": "[concat(deployment().name, '-vm')]",
      "type": "Microsoft.Resources/deployments",
      "apiVersion": "2016-09-01",
      "properties": {
        "mode": "Incremental",
        "templateLink": {
          "uri": "[variables('vmTemplate')]",
          "contentVersion": "1.0.0.0"
        },
        "parameters": {
          "configuration": { "value": "[reference(concat(deployment().name, '-config').outputs.configuration.value)]" },
          "vmName": { "value": "[parameters('vmName')]" },
          "vmSize": { "value": "[parameters('vmSize')]" },
          "os": { "value": "[parameters('os')]" },
          "managedDiskTier": { "value": "[parameters('managedDiskTier')]" },
          "dataDisksToProvision": { "value": "[parameters('dataDisksToProvision')]" },
          "dataDiskSizeGB": { "value": "[parameters('dataDiskSizeGB')]" },
          "domainJoined": { "value": "[parameters('domainJoined')]" },
          "localAdminUsername": { "value": "[parameters('localAdminUsername')]" },
          "localAdminPassword": { "value": "[parameters('localAdminPassword')]" },
          "numberOfNics": { "value": "[parameters('numberOfNics')]" },
          "subnetName": { "value": "[parameters('subnetName')]" },
          "highlyAvailable": { "value": "[parameters('highlyAvailable')]" },
          "availabilitySetName": { "value": "[parameters('availabilitySetName')]" },
          "availabilitySetUpdateDomains": { "value": "[parameters('availabilitySetUpdateDomains')]" },
          "availabilitySetFaultDomains": { "value": "[parameters('availabilitySetFaultDomains')]" }
        }
      }
    }
  ],
  "outputs": {
    "configuration": {
      "type": "object",
      "value": "[reference(concat(deployment().name, '-config')).outputs.configuration.value]"
    }
  }

Deploying the first resource on it's own succeeds, and the output [reference(concat(deployment().name, '-config')).outputs.configuration.value] is correctly returned, and contains all the correct information and is well formed.

If I then add the second resource into the mix, then the deployment fails with the following error:

08:57:41 - [ERROR] New-AzureRmResourceGroupDeployment : 08:57:41 - Error: Code=InvalidTemplate; 
08:57:41 - [ERROR] Message=Deployment template validation failed: 'The template resource 
08:57:41 - [ERROR] 'rcss.test.vm-0502-0757-rcss-vm' at line '317' and column '6' is not valid: 
08:57:41 - [ERROR] The language expression property 'Microsoft.WindowsAzure.ResourceStack.Frontdoo
08:57:41 - [ERROR] r.Expression.Expressions.JTokenExpression' can't be evaluated.. Please see 
08:57:41 - [ERROR] https://aka.ms/arm-template-expressions for usage details.'.

If I remove the "configuration" parameter from both this parameter set and from the referenced template (the referenced template has all contents commented out to ensure we are testing only the pass-through of the parameters), then the deployment succeeds, indicating that the issue is related to the parsing of the parameter string "[reference(concat(deployment().name, '-config').outputs.configuration.value)]".

Can anyone offer any insight as to whether I need to refer to output objects from deployment resources in a specific way in the context of a linked template parameter set?

Upvotes: 1

Views: 2459

Answers (1)

Antony Gibbs
Antony Gibbs

Reputation: 3480

So after examining this more closely, I found that the syntax I was using was incorrect, but not reported by the parser:

"[reference(concat(deployment().name, '-config').outputs.configuration.value)]"

Should have been:

"[reference(concat(deployment().name, '-config')).outputs.configuration.value]"

Schoolboy error.

Upvotes: 2

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