custom-shared-image.json

{
    "apiVersion": "vlabs",
    "properties": {
      "masterProfile": {
        "imageReference": {
          "name": "linuxvm",
          "resourceGroup": "sig",
          "subscriptionID": "00000000-0000-0000-0000-000000000000",
          "gallery": "siggallery",
          "version": "0.0.1"
        },
        "count": 1,
        "dnsPrefix": "",
        "vmSize": "Standard_D2_v3"
      },
      "agentPoolProfiles": [
        {
          "name": "agentpool1",
          "count": 3,
          "imageReference": {
            "name": "linuxvm",
            "resourceGroup": "sig",
            "subscriptionID": "00000000-0000-0000-0000-000000000000",
            "gallery": "siggallery",
            "version": "0.0.1"
          },
          "vmSize": "Standard_D2_v3",
          "availabilityProfile": "AvailabilitySet"
        }
      ],
      "linuxProfile": {
        "adminUsername": "azureuser",
        "ssh": {
          "publicKeys": [
            {
              "keyData": ""
            }
          ]
        }
      }
    }
  }