Update-AzDNSRecordMultiSub.ps1
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<#PSScriptInfo
.Description Updates a DNS record for a Azure VM if the record does not match the current public ip. This script works across multiple subscriptions and when properly delegated via Azure Lighthouse across tenants. .VERSION 1.0.0 .GUID cbb81bef-e9d2-47ce-8059-e97943454e89 .AUTHOR Jonathan Warnken - @MrBodean - http://www.mrbodean.net/ .COMPANYNAME .COPYRIGHT (C) Jonathan Warnken 2020 All rights reserved. .TAGS Azure, Runbook, Automation, DNS .LICENSEURI https://github.com/mrbodean/Technet/blob/master/Powershell/Update-AzDNSRecordMultiSub/License .PROJECTURI https://github.com/mrbodean/Technet/tree/master/Powershell/Update-AzDNSRecordMultiSub .ICONURI .EXTERNALMODULEDEPENDENCIES Az .REQUIREDSCRIPTS .EXTERNALSCRIPTDEPENDENCIES .RELEASENOTES Initial Release #> Param( # Automation Run As Account [Parameter(Mandatory=$true)] [String]$RunAsAccount = "AzureRunAsConnection", # SubscriptionId that contains the VM [Parameter(Mandatory=$true)] [String]$SubscriptionId1, # SubscriptionId that contains the DNS zone [Parameter(Mandatory=$true)] [String]$SubscriptionId2, # Resource group name that contains the VM [Parameter(Mandatory=$true)] [String]$vmresourcegroup, # Public Ip address name for the VM [Parameter(Mandatory=$true)] [String]$vmipname, [Parameter(Mandatory=$true)] # Public DNS record to resolve - i.e. MyApp.contoso.com [String]$DNSrecord, [Parameter(Mandatory=$true)] # DNS Zone name - i.e. contoso.com [String]$DNSzone, [Parameter(Mandatory=$true)] # Resource group name that contains the DNS Zone [String]$DNSresourcegroup, # DNS zone record name - i.e. MyApp [Parameter(Mandatory=$true)] [String]$DNSrecordName ) $connectionName = $RunAsAccount $servicePrincipalConnection = Get-AutomationConnection -Name $connectionName Connect-AzAccount -ServicePrincipal -TenantId $servicePrincipalConnection.TenantId -ApplicationId $servicePrincipalConnection.ApplicationId -CertificateThumbprint $servicePrincipalConnection.CertificateThumbprint | out-null Write-Output "Connecting to subscription: $SubscriptionId1" Select-AzSubscription -SubscriptionId $SubscriptionId1 | out-null $VMIP = (Get-AzPublicIpAddress -ResourceGroupName $vmresourcegroup -Name $vmipname).IpAddress Write-Output "VM Public Ip is $VMIP" $DynDNS = $DNSrecord #Get IP based on the Domain Name [string]$MyDynamicIP = ([System.Net.DNS]::GetHostAddresses($DynDNS)).IPAddressToString Write-Output "$DynDNS resolves to $MyDynamicIP" If($VMIP -ne $MyDynamicIP){ Write-Output "Connecting to subscription: $SubscriptionId2" Select-AzSubscription -SubscriptionId $SubscriptionId2 | out-null $zone = Get-AzDnsZone -Name $DNSzone -ResourceGroupName $DNSresourcegroup $dnsrs = Get-AzDnsRecordSet -Zone $zone -Name $DNSrecordName -RecordType A $DNSIP = (Get-AzDnsRecordSet -Zone $zone -Name $DNSrecordName -RecordType A).Records.Ipv4Address Remove-AzDnsRecordConfig -RecordSet $dnsrs -Ipv4Address $DNSIP Add-AzDnsRecordConfig -RecordSet $dnsrs -Ipv4Address $VMIP Set-AzDnsRecordSet -RecordSet $dnsrs } |