azuredeploy.json

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentParameters.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
      "imagetemplatename": {
          "value": "customRHELtemplate75"
          },
          "api-version": {
              "value": "2018-02-01-preview"
            },
          "svclocation": {
              "value": "westcentralus"
          },
          "sourceURI": {
            "value": "https://storageaccount.blob.core.windows.net/container/rhel-server-7.5-x86_64-dvd.iso"
          },
          "sha256Checksum": {
            "value": "d0dd6ae5e001fb050dafefdfd871e7e648b147fb2d35f0e106e0b34a0163e8f5"
          },
          "customizestepname": {
            "value": "ProdShellScript"
          },
          "customizescriptpath": {
            "value": "https://storageaccount.blob.core.windows.net/container/customize.sh"
          },
          "galleryImageId": {
            "value": "/subscriptions/ssssssss-ssss-ssss-ssss-ssssssssssss/resourceGroups/groupname/providers/Microsoft.Compute/galleries/myGallery/images/myImageDefinition"
          },
          "sharedgalimagename": {
            "value": "customRHEL"
          }
        }
      
    }