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We’re creating a VMSS and we use a custom DNS with extending AD from on-premises, but we are not sure how to register the VMs as the scale set scales out, in azure DNS we can create a private zone and use auto registration but not with our custom DNS. Basically I’m trying to understand as each VMs scales out how do the newly created VMs register with dns? Thanks

Norrin Rad
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  • This is going to be down to what you DNS provider offers. – Sam Cogan May 04 '22 at 20:49
  • I was hoping to use AD DNS, but what I’m thinking is as the VMs are created in the availability set they wouldn’t need to be registered in DNS, wouldn’t traffic just route to them as they form part of the backend pool for the load balancer on the VMSS? – Norrin Rad May 05 '22 at 00:25
  • If your VM's are behind a load balancer (it is possible to turn that off), and you want to load balance the traffic, then you are correct, the only thing you need is the loadbalancer name – Sam Cogan May 06 '22 at 14:21
  • @SamCogan thanks, a quick related follow up question if we extend AD DS into Azure, can we still have Azure DNS running and use a conditional forwarder to send traffic to Azure DNS? – Norrin Rad May 10 '22 at 23:54
  • Sorry Azure Private DNS not Azure DNS I meant. – Norrin Rad May 11 '22 at 00:02

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