Even rebooting the VM won’t trigger the registration, but what will work is updating the IP configuration of the NIC attached to the VM. Should it be shut down or deleted the second VM will still not have a record created. If two VMs in different VNets have the same name the first VM registered will get and keep the DNS record. If a VM is powered off or deleted in a VNet with auto registration enabled the DNS entry will be automatically removed. This may have architectural ramifications if different systems in your environment have different name resolution requirements. You may have noticed we’re have to link DNS Zones to VNets. As soon as the zone is linked to the VNet Azure begins using it automatically. No changes are required to our VMs or DNS server settings, they’re still pointing to the Azure Provided DNS default server of 168.63.129.16. There we have it, split DNS with Azure Private DNS Zones. First, confirm name resolution from Web1 to the public Google IPs. Let’s demonstrate this with a quick lab by creating a private zone for. When querying a public DNS resolver the external IP is returned and when querying an internal resolver the internal IP is returned.Īzure Private DNS Zones allow us to create zones for publicly resolvable domains. Our external user is out on the Internet and needs to access the CRM via the public IP, whereas our internal user can reach the server directly. This is for scenarios where we have publicly resolvable domains that return public IP addresses but we may want internal users to resolve a different IP (usually the locally accessible internal IP). Private zones can be used to enable split horizon name resolution. ResolveDnsName Split Horizon with Azure DNS Private Zones FullyQualifiedErrorId : DNS_ERROR_RCODE_NAME_ERROR ,Microsoft. CategoryInfo : ResourceUnavailable: (log1:String ), Win32Exception Resolve-DnsName : log1 : DNS name does not exist Here we create the Azure Private DNS Zone resource all we need to provide is the Resource Group we want to hold our zone and the zone name.ĭNS Suffix Search List. The configuration is simple so let’s go through a few examples. We can manually add records and we can link it to a VNet or multiple VNets and have VMs auto registered. Azure DNS Private ZonesĪzure DNS Private Zones gives us a manageable DNS zone within Azure. If you have a hybrid environment or multiple VNets and need name resolution between those resources, read on. It is a very simple service which is free and provides minimally configurable DNS options. xml ) | ConvertFrom-SecureString -AsPlainText )Īnd that’s it on Azure Provided DNS. admin -password ( ( Import-Clixml ~ /winpw. public -ip -address -dns -name db1 -super -unique -name ` # This will be ignored as there is no public IP assigned -admin -username md ` This can be done during VM creation, here is an Azure CLI example, note the -public-ip-address-dns-name option. Public DNS Names for Azure VMsīy default an Azure VM won’t have a public DNS name even if it has a public IP address assigned, however, Azure will allow us to configure one under the. If we need internal name resolution between VNets Azure DNS Private Zones are good option, but before we move onto that let’s cover public DNS names for Azure VMs. CategoryInfo : ResourceUnavailable: (web1. PS C:\> Resolve-DnsName "." Resolve-DnsName : web1. Web1 and Db1 will be able to resolve each other’s hostnames using the Azure Provided DNS service, but neither will be able to resolve the Log1 VM which is in a different VNet.ĭNS Suffix Search List. In this diagram we have two VNets with two different DNS Suffixes which are inherited by the VMs. I’ve set up a small lab environment as shown below to demonstrate the different DNS services offered in Azure. Azure Provided DNS can handle name resolution between VMs inside a VNet that share the same suffix but will not perform name resolution for VMs in another VNet, even if peering is established. and this suffix will be identical for every VM inside the VNet. This is the Azure Provided DNS service, it can handle name resolution for public names as well as name resolution inside a VNet.Įach VM within a VNet will have a DNS suffix resembling. When you spin up a VM the default DNS server configured in the VM is 168.63.129.16. In this post we’re going to cover the services and features Azure provides for DNS name resolution inside the cloud and to multi-cloud/on-prem resources.Īzure Provided DNS is the default name resolution service provided by Azure.
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