Azure part 2 – adding subnets to existing vnets

It’s now time to add subnets to the first vnet.

Let’s do the first two with Powershell:

PS /home/tode> $virtualNetwork = Get-AzVirtualNetwork -Name HUBVNET

PS /home/tode> Add-AzVirtualNetworkSubnetConfig -Name gatewaySubnet -VirtualNetwork $virtualNetwork -AddressPrefix "10.0.0.0/27"

PS /home/tode> Add-AzVirtualNetworkSubnetConfig -Name FirewallSubnet -VirtualNetwork $virtualNetwork -AddressPrefix "10.0.0.32/27"
PS /home/tode> $virtualNetwork | Set-AzVirtualNetwork 

Name                   : HUBVNET
ResourceGroupName      : MainRG
Location               : eastus
Id                     : /subscriptions/62dd0295-0094-443a-9b60-4c75dac248eb/resourceGroups/MainRG/providers/Microsoft.Network/virtualNetworks/HUBVNET
Etag                   : W/"e81a3b5f-a4e9-4986-8d2f-d7b79e3237df"
ResourceGuid           : 9ccba534-fa70-4e97-9901-ac19afe36051
ProvisioningState      : Succeeded
Tags                   : 
AddressSpace           : {
                           "AddressPrefixes": [
                             "10.0.0.0/16"
                           ]
                         }
DhcpOptions            : {}
FlowTimeoutInMinutes   : null
Subnets                : [
                           {
                             "Delegations": [],
                             "Name": "gatewaySubnet",
                             "Etag": "W/\"e81a3b5f-a4e9-4986-8d2f-d7b79e3237df\"",
                             "Id": "/subscriptions/62dd0295-0094-443a-9b60-4c75dac248eb/resourceGroups/MainRG/providers/Microsoft.Network/virtualNetworks/HUBVNET/subne
                         ts/gatewaySubnet",
                             "AddressPrefix": [
                               "10.0.0.0/27"
                             ],
                             "IpConfigurations": [],
                             "ServiceAssociationLinks": [],
                             "ResourceNavigationLinks": [],
                             "ServiceEndpoints": [],
                             "ServiceEndpointPolicies": [],
                             "PrivateEndpoints": [],
                             "ProvisioningState": "Succeeded",
                             "PrivateEndpointNetworkPolicies": "Enabled",
                             "PrivateLinkServiceNetworkPolicies": "Enabled",
                             "IpAllocations": []
                           },
                           {
                             "Delegations": [],
                             "Name": "FirewallSubnet",
                             "Etag": "W/\"e81a3b5f-a4e9-4986-8d2f-d7b79e3237df\"",
                             "Id": "/subscriptions/62dd0295-0094-443a-9b60-4c75dac248eb/resourceGroups/MainRG/providers/Microsoft.Network/virtualNetworks/HUBVNET/subne
                         ts/FirewallSubnet",
                             "AddressPrefix": [
                               "10.0.0.32/27"
                             ],
                             "IpConfigurations": [],
                             "ServiceAssociationLinks": [],
                             "ResourceNavigationLinks": [],
                             "ServiceEndpoints": [],
                             "ServiceEndpointPolicies": [],
                             "PrivateEndpoints": [],
                             "ProvisioningState": "Succeeded",
                             "PrivateEndpointNetworkPolicies": "Enabled",
                             "PrivateLinkServiceNetworkPolicies": "Enabled",
                             "IpAllocations": []
                           }
                         ]
VirtualNetworkPeerings : []
EnableDdosProtection   : false
DdosProtectionPlan     : null
ExtendedLocation       : null

Now let’s do the third subnet with a template. I exported the template for the vnet in the azure portal and added the third subnet accordingly:

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "virtualNetworks_HUBVNET_name": {
            "defaultValue": "HUBVNET",
            "type": "String"
        }
    },
    "variables": {},
    "resources": [
        {
            "type": "Microsoft.Network/virtualNetworks",
            "apiVersion": "2020-11-01",
            "name": "[parameters('virtualNetworks_HUBVNET_name')]",
            "location": "eastus",
            "properties": {
                "addressSpace": {
                    "addressPrefixes": [
                        "10.0.0.0/16"
                    ]
                },
                "subnets": [
                    {
                        "name": "gatewaySubnet",
                        "properties": {
                            "addressPrefix": "10.0.0.0/27",
                            "serviceEndpoints": [],
                            "delegations": [],
                            "privateEndpointNetworkPolicies": "Enabled",
                            "privateLinkServiceNetworkPolicies": "Enabled"
                        }
                    },
                    {
                        "name": "FirewallSubnet",
                        "properties": {
                            "addressPrefix": "10.0.0.32/27",
                            "serviceEndpoints": [],
                            "delegations": [],
                            "privateEndpointNetworkPolicies": "Enabled",
                            "privateLinkServiceNetworkPolicies": "Enabled"
                        }
                    },
					{
                        "name": "OtherSubnet",
                        "properties": {
                            "addressPrefix": "10.0.0.64/27",
                            "serviceEndpoints": [],
                            "delegations": [],
                            "privateEndpointNetworkPolicies": "Enabled",
                            "privateLinkServiceNetworkPolicies": "Enabled"
                        }
                    }
                ],
                "virtualNetworkPeerings": [],
                "enableDdosProtection": false
            }
        },
        {
            "type": "Microsoft.Network/virtualNetworks/subnets",
            "apiVersion": "2020-11-01",
            "name": "[concat(parameters('virtualNetworks_HUBVNET_name'), '/FirewallSubnet')]",
            "dependsOn": [
                "[resourceId('Microsoft.Network/virtualNetworks', parameters('virtualNetworks_HUBVNET_name'))]"
            ],
            "properties": {
                "addressPrefix": "10.0.0.32/27",
                "serviceEndpoints": [],
                "delegations": [],
                "privateEndpointNetworkPolicies": "Enabled",
                "privateLinkServiceNetworkPolicies": "Enabled"
            }
        },
        {
            "type": "Microsoft.Network/virtualNetworks/subnets",
            "apiVersion": "2020-11-01",
            "name": "[concat(parameters('virtualNetworks_HUBVNET_name'), '/gatewaySubnet')]",
            "dependsOn": [
                "[resourceId('Microsoft.Network/virtualNetworks', parameters('virtualNetworks_HUBVNET_name'))]"
            ],
            "properties": {
                "addressPrefix": "10.0.0.0/27",
                "serviceEndpoints": [],
                "delegations": [],
                "privateEndpointNetworkPolicies": "Enabled",
                "privateLinkServiceNetworkPolicies": "Enabled"
            }
        },
		{
            "type": "Microsoft.Network/virtualNetworks/subnets",
            "apiVersion": "2020-11-01",
            "name": "[concat(parameters('virtualNetworks_HUBVNET_name'), '/OtherSubnet')]",
            "dependsOn": [
                "[resourceId('Microsoft.Network/virtualNetworks', parameters('virtualNetworks_HUBVNET_name'))]"
            ],
            "properties": {
                "addressPrefix": "10.0.0.64/27",
                "serviceEndpoints": [],
                "delegations": [],
                "privateEndpointNetworkPolicies": "Enabled",
                "privateLinkServiceNetworkPolicies": "Enabled"
            }
        }
    ]
}

Now let’s deploy this json:

PS /home/tode> New-AzResourceGroupDeployment -ResourceGroupName MainRG -TemplateFile /home/tode/Dokumente/addsubnets.json

DeploymentName          : addsubnets
ResourceGroupName       : MainRG
ProvisioningState       : Succeeded
Timestamp               : 29.09.2021 13:41:59
Mode                    : Incremental
TemplateLink            : 
Parameters              : 
                          Name                            Type                       Value     
                          ==============================  =========================  ==========
                          virtualNetworks_HUBVNET_name    String                     HUBVNET   
                          
Outputs                 : 
DeploymentDebugLogLevel : 

Finally, I created a short script:

$vnetlist = Get-AzResource -ResourceGroupName MainRG
foreach ($item in $vnetlist) {
$vnet = Get-AzVirtualNetwork -Name $item.Name 
foreach ($subnet in $vnet.Subnets) {
	$vnet.Name
	$vnet.Location
	$subnet.Name
	$subnet.AddressPrefix
	}
}