Deploying Web App for containers using ARM templates

Question

I have been trying to automate deployment of my resources to resource group on Azure. Right now I am using ARM templates and so far I was able to create App Insights and App Service Plan using a template. This is how it looks like:

{
   "apiVersion": "2015-05-01",
   "name": "[variables('servicePlan')]",
   "kind": "linux",
   "type": "Microsoft.Web/serverfarms",
   "location": "[resourceGroup().location]",
   "tags": {
           "displayName": "BTC Push Notification Settings HostingPlan"
    },
    "sku": {
           "name": "[variables('skuNamePlan')]",
           "capacity": "[variables('skuSizePlan')]"
    },
    "properties": {
            "name": "[variables('servicePlan')]"
    }
},
{
    "apiVersion": "2015-05-01",
    "name": "[variables('appInsights')]",
    "type": "Microsoft.Insights/components",
    "location": "southcentralus",
    "tags": {
            "[concat('hidden-link:', resourceGroup().id, '/providers/Microsoft.Web/sites/', variables('appInsights'))]": "Resource",
            "displayName": "BTC Push Notification Settings App Insights"
     },
     "properties": {
            "applicationId": "[variables('appInsights')]"
        }
 }

I am having hard time creating Web App for Containers and pointing it to my docker image using ARM template. I have done it manually and it worked, likewise I did it through azure-cli like this az webapp create --resource-group ExampleGroupAlpina --plan myAppServicePlan --name DockerContainer --deployment-container-image-name this-is-my-image/sample-docker and this worked as well. I would appreciate if anyone could suggest creating this Web App for Containers using ARM Template.

Answer 1

For me none of these other answers worked. With the assistance of Azure support and these other answers I came up with the following template, that succesfully creates an app service plan with an Linux App Service for Containers running a custom Docker image from Azure Container Repository:

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "environment":{
      "type": "string"
    },
    "location": {
      "type": "string",
      "defaultValue": "[resourceGroup().location]",
      "metadata": {
        "description": "Location (region) for all resources."
      }
    },   
    "appServiceSku": {
      "type": "string",
      "defaultValue": "B1",
      "metadata": {
        "description": "The SKU of App Service Plan "
      }
    },
    "dockerImageName": {
      "type": "string",
      "defaultValue": "_MY_REGISTRY_USERNAME_.azurecr.io/_MY_NAMESPACE_/_MY_DOCKER_IMAGE_NAME_:_TAG_"
    },
    "dockerRegistryUrl": {
      "type": "string",
      "defaultValue": "https://_MY_REGISTRY_USERNAME_.azurecr.io"
    },
    "dockerRegistryUsername": {
      "type": "string",
      "defaultValue": "_MY_REGISTRY_USERNAME_"
    },
    "dockerRegistryPassword": {
      "type": "string",
      "defaultValue": "_MY_REGISTRY_PSW_"
    },
    "_artifactsLocation": {
      "type": "string"
    },
    "_artifactsLocationSasToken": {
      "type": "securestring"
    }
  },
  "variables": {
    "name": "projectname-",
    "webAppPortalName": "[concat(variables('name'), parameters('environment'), '-webapp')]",
    "appServicePlanName": "[concat(variables('name'), parameters('environment'),'-hosting')]",
  "resources": [       
    {
      "apiVersion": "2017-08-01",
      "type": "Microsoft.Web/serverfarms",
      "kind": "linux",
      "name": "[variables('appServicePlanName')]",
      "location": "[parameters('location')]",
      "comments": "This app service plan is used for the web app and slots.",
      "properties": {
        "reserved": true
      },
      "dependsOn": [],
      "sku": {
        "name": "[parameters('appServiceSku')]"
      }
    },
    {
      "type": "Microsoft.Web/sites",
      "apiVersion": "2016-08-01",
      "name": "[variables('webAppPortalName')]",
      "kind": "app,linux,container",
      "location": "[parameters('location')]",
      "dependsOn": [
        "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
      ],
      "properties": {
        "name": "[variables('webAppPortalName')]",
        "siteConfig": {
          "linuxFxVersion": "[concat('DOCKER|', parameters('dockerImageName'))]",
          "alwaysOn": true,
          "appSettings": [
            {
              "name": "WEBSITES_ENABLE_APP_SERVICE_STORAGE",
              "value": "false"
            },
            {
              "name": "DOCKER_REGISTRY_SERVER_URL",
              "value": "[parameters('dockerRegistryUrl')]"
            },
            {
              "name": "DOCKER_REGISTRY_SERVER_USERNAME",
              "value": "[parameters('dockerRegistryUsername')]"
            },
            {
              "name": "DOCKER_REGISTRY_SERVER_PASSWORD",
              "value": "[parameters('dockerRegistryPassword')]"
            }
          ]
        },
        "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', variables('appServicePlanName'))]"
      }
    }
  ]
}

_artifactsLocation and _artifactsLocationSasToken do not need values, but somehow they need to be included. The main difference to other answers is the inclusion of the reserved attribute in the properties for the App Service Plan.

Hopefully this saves some of the headache this created for me!