Terraform: manage DNS records

How to manage DNS records with dynamic updates and terraform with your authoritative server.

Requirements.

Enable DNS update to your pdns.conf

dnsupdate=yes

Create a Tsig key and set metadata to your zone to authorize DNSUPDATE and AXFR with TSIG authentication.

TSIG-ALLOW-DNSUPDATE
TSIG-ALLOW-AXFR

Provider configuration

1. Create a main.tf file

2. Install the provider "dns" then, run terraform init.

terraform {
  required_providers {
    dns = {
      source = "hashicorp/dns"
      version = "3.1.0"
    }
  }
}

3. Configure your provider with address of the DNS server to send updates to and TSIG authentication parameters

provider "dns" {
  update {
    server        = "192.168.0.1"
    key_name      = "example.com."
    key_algorithm = "hmac-md5"
    key_secret    = "3VwZXJzZWNyZXQ="
  }
}

Create DNS record

The following records can be managed from the provider terraform:

• A
• AAAA
• CNAME
• TXT
• PTR
• SRV
• NS
• MX

Example for A record:

resource "dns_a_record_set" "www" {
  zone = "example.com."
  name = "www"
  addresses = [
    "192.168.0.1",
    "192.168.0.2",
    "192.168.0.3",
  ]
  ttl = 300
}

Run terraform destroy to delete it.