ARM Templates

• Why ARM Templates
  • Repeatable and consistent Infrastructure creation
  • Infrastructure as Code (IAC)
• Approach for effective Template writing?
  • Template creator needs to know manual steps
    • What has to be created will be clear
    • Order of creation
  • Template creator should know about
    • parameters
    • variables
    • resources
    • outputs
    • conditions
    • functions

Scenario: Create a network with 4 subnets

• Portal: Steps are
  • Create/pick a resource group
  • Create a vnet with address range of 192.168.0.0/16
  • Create a subnet with
    • Name: subnet1 address range => 192.168.0.0/24
    • Name: subnet2 address range => 192.168.1.0/24
    • Name: subnet3 address range => 192.168.2.0/24
    • Name: subnet4 address range => 192.168.3.0/24
• Writing Template
  • Anything which we create is a resource (most of the times)
  • Lets start from basic template and add the resources

  {
      "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
      "contentVersion": "0.0.0.1",
      "resources": [
          {
              "name": "armvnet",
              "type": "Microsoft.Network/virtualNetworks",
              "apiVersion": "2020-04-01",
              "location": "eastus",
              "properties": {
                  "addressSpace": {
                      "addressPrefixes": [
                          "192.168.0.0/16"
                      ]
                  },
                  "subnets": [
                      {
                          "name": "subnet1",
                          "properties": {
                              "addressPrefix": "192.168.0.0/24"
                          }
                      },
                      {
                          "name": "subnet2",
                          "properties": {
                              "addressPrefix": "192.168.1.0/24"
                          }
                      },
                      {
                          "name": "subnet3",
                          "properties": {
                              "addressPrefix": "192.168.2.0/24"
                          }
                      },
                      {
                          "name": "subnet4",
                          "properties": {
                              "addressPrefix": "192.168.3.0/24"
                          }
                      }
                  ]
              }
          }
      ]
  
  }
  

  • Now create a deployment for the template
  • Now Go the Virtual network and verify the resources created
  • Navigate to the Resource group => Deployments
  • Now try to add a storage account to the deployment
  • So the total template will be as shown below and create the deployment for that to see storage account

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "0.0.0.1",
    "resources": [
        {
            "name": "armvnet",
            "type": "Microsoft.Network/virtualNetworks",
            "apiVersion": "2020-04-01",
            "location": "eastus",
            "properties": {
                "addressSpace": {
                    "addressPrefixes": [
                        "192.168.0.0/16"
                    ]
                },
                "subnets": [
                    {
                        "name": "subnet1",
                        "properties": {
                            "addressPrefix": "192.168.0.0/24"
                        }
                    },
                    {
                        "name": "subnet2",
                        "properties": {
                            "addressPrefix": "192.168.1.0/24"
                        }
                    },
                    {
                        "name": "subnet3",
                        "properties": {
                            "addressPrefix": "192.168.2.0/24"
                        }
                    },
                    {
                        "name": "subnet4",
                        "properties": {
                            "addressPrefix": "192.168.3.0/24"
                        }
                    },
                    
                    {
                        "name": "subnet5",
                        "properties": {
                            "addressPrefix": "192.168.4.0/24"
                        }
                    },
                    {
                        "name": "subnet6",
                        "properties": {
                            "addressPrefix": "192.168.5.0/24"
                        }
                    }

                ]
            }
        },
        {
            "name": "qtstoragedemoarm",
            "type": "Microsoft.Storage/storageAccounts",
            "apiVersion": "2019-06-01",
            "tags": {
                "displayName": "qtstoragedemoarm"
            },
            "location": "eastus",
            "kind": "StorageV2",
            "sku": {
                "name": "Standard_RAGRS",
                "tier": "Standard"
            },
            "properties": {
                "accessTier": "Hot"
            }
        }
    ]

}