DNS SRV Records with Terraform

README.md

DNS SRV with Terraform (On AWS Route53)

DNS SRV records are a little cryptic. Even when you create them, it's not particularly obvious what the information in the SRV record actaully means.

When creating the records with Terraform, you can for_each the resource to supply one or more maps that contain better descriptors of the SRV record's constituent components. See the example in the terraform snippet below. Refer here for a longer explanation.

dns-srv.tf

resource "aws_route53_record" "office_365_srv" {
  for_each = {
    "_sip._tls" = {
        port = 443
        weight = 100
        priority = 1
        target = "sipdir.online.lync.com."
      }
    "_sipfederationtls._tcp" = {
        priority = 1
        weight = 100
        port = 5061
        target = "sipfed.online.lync.com."
      }
  }

  zone_id = aws_route53_zone.my_domain.zone_id
  name    = each.key
  type    = "SRV"
  ttl     = "300"
  records = ["${each.value.priority} ${each.value.weight} ${each.value.port} ${each.value.target}"]
}