Question: Reverse Lookup On Private DNS Zone

[akamalov]

Greetings,

Please note, this is a question, no issue is being raised.

I tried to post a question in Stack Overflow, but I got zero hits back (https://stackoverflow.com/questions/47645016/azure-private-dns-reverse-lookup-terraform)

Question: I am a little confused about reverse lookup on Azure.

What I want to do is to reverse-lookup private IP addresses assigned. I can forward lookup my internal zone (something like auto generated fgityvclopuymnv.bx.internal.cloudapp.net), but I cannot reverse lookup the IP address

I did create in-addr.arpa segment for the network segment using Terraform, but it seem still not provide a reverse lookup.

###########################################################################
# Reverse DNS Lookup
###########################################################################

resource "azurerm_dns_zone" "reverse-8_0_10" {
  name                = "8.0.10.in-addr.arpa"
  resource_group_name = "${azurerm_resource_group.rg.name}"
tags {
      environment = "${var.environment_tag}"
     }
}

resource "azurerm_dns_ptr_record" "zookeeper" {
  name                = "zookeeper"
  zone_name           = "${azurerm_dns_zone.reverse-8_0_10.name}"
  resource_group_name = "${azurerm_resource_group.rg.name}"
  ttl                 = 60
  records             = ["${var.env_short_name}-private.${var.dns_suffix}"]
tags {
      environment = "${var.environment_tag}"
     }
}

resource "azurerm_dns_ptr_record" "kafka" {
  name                = "kafka"
  zone_name           = "${azurerm_dns_zone.reverse-8_0_10.name}"
  resource_group_name = "${azurerm_resource_group.rg.name}"
  ttl                 = 60
  records             = ["${var.env_short_name}-private.${var.dns_suffix}"]
 tags {
      environment = "${var.environment_tag}"
     }
}

Zone gets created, as well as PTR records, but still reverse lookup is not possible.

I did go through https://www.terraform.io/docs/providers/azurerm/r/dns_ptr_record.html but still can't seem to grasp how reverse lookup is attainable in Azure environment.

Are there any examples that can demonstrate such as:

• Create internal DNS zone
• Create in-addr.arpa reverse zone

...using Terraform? May be I can model after it and solve this problem.

Thanks so much in advance!!

[ranieuwe]

This was not possible with Azure DNS at the time this question got posted. The resolver on the Virtual Network would not be able to know where to go for the DNS resolution for the private arpa zone and hence could do not do any reverse DNS resolution.

With the release of Azure Private DNS this is now possible though.

PR #1404 should bring that functionality to Terraform.

If this answers your question, can this issue be closed?

[akamalov]

Yes. Thank you so much!!

…

On Thu, Jun 28, 2018, 6:01 PM Roeland Nieuwenhuis ***@***.***> wrote: This was not possible with Azure DNS at the time this question got posted. The resolver on the Virtual Network would not be able to know where to go for the DNS resolution for the private arpa zone and hence could do not do any reverse DNS resolution. With the release of Azure Private DNS <https://docs.microsoft.com/en-us/azure/dns/private-dns-overview> this is now possible though. PR #1404 <#1404> should bring that functionality to Terraform. If this answers your question, can this issue be closed? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#607 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AHhRyYgRt5jihE6w-jGffkhDGDYNDBHEks5uBVIigaJpZM4Q2--9> .

[tombuildsstuff]

👍 closing in favour of #1404

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!