Terraform OVH external DNS records 2023-10-22 Last edit: 2023-10-22 --------------------- Environment replication is always very useful, and I've always made sure that all my operations and work can be automated and replicated. For example, I've written Terraform configuration files for OVH DNS entries. This turned out to be more useful than expected, given that I had to change server, I had to move everything and the automations saved me a lot of time, especially those linked to the machine's IP address. ## Requirements The Terraform OVH provider requires certain environment variables: - `OVH_ENDPOINT` - `OVH_APPLICATION_KEY` - `OVH_APPLICATION_SECRET` - `OVH_CONSUMER_KEY` To access them, simply go to (HTM) OVH's API token creation page . ## Use cases For (HTM) theobori.cafe , I used the following configurations. **`providers.tf`** ```hcl terraform { required_providers { ovh = { source = "ovh/ovh" version = "0.34.0" } } } provider "ovh" { endpoint = "ovh-eu" } ``` **`variables.tf`** ```hcl variable "domain" { type = string description = "The managed domain name" } variable "subdomains" { type = set(string) description = "The subdomains directly link to `var.domain_name`" default = [ "www", "status", "cringe", "etherpad", "search", "mail", "cloud" ] } variable "host" { type = string description = "The target host IPv4 address" sensitive = true } variable "host_ipv6" { type = string description = "The target host IPv6 address" default = null sensitive = true } variable "dkim_key" { type = string description = "The TXT DNS entry containing the DKIM key" default = null sensitive = true } variable "smtp_tlsa" { type = string description = "The SMTP TLS fingerprint" default = null sensitive = true } ``` **`main.tf`** ```hcl resource "ovh_domain_zone_record" "domain" { zone = var.domain fieldtype = "A" target = var.host } resource "ovh_domain_zone_record" "www_domain" { zone = var.domain subdomain = "www" fieldtype = "A" target = var.host } resource "ovh_domain_zone_record" "mail" { zone = var.domain fieldtype = "MX" ttl = 300 target = "10 mail" } resource "ovh_domain_zone_record" "dmarc" { zone = var.domain subdomain = "_dmarc" fieldtype = "TXT" target = "v=DMARC1; p=none; rua=mailto:dmarc@${var.domain}" } resource "ovh_domain_zone_record" "spf" { for_each = toset( [ "", "www" ] ) zone = var.domain subdomain = each.key fieldtype = "TXT" target = "v=spf1 a mx -all" } resource "ovh_domain_zone_record" "www_txt" { zone = var.domain fieldtype = "TXT" target = "1|www.${var.domain}" } resource "ovh_domain_zone_record" "dkim_key" { count = var.dkim_key == null ? 0 : 1 zone = var.domain subdomain = "dkim._domainkey" fieldtype = "TXT" target = var.dkim_key } resource "ovh_domain_zone_record" "subdomain_entries" { for_each = var.subdomains zone = var.domain subdomain = each.key fieldtype = "A" target = var.host } resource "ovh_domain_zone_record" "mail_ipv6" { count = var.host_ipv6 == null ? 0 : 1 zone = var.domain subdomain = "mail" fieldtype = "AAAA" target = var.host_ipv6 } resource "ovh_domain_zone_record" "smtp_fingerprint_tlsa" { count = var.smtp_tlsa == null ? 0 : 1 zone = var.domain subdomain = "_25._tcp.mail" fieldtype = "TLSA" target = var.smtp_tlsa } resource "ovh_domain_zone_record" "autodiscover" { zone = var.domain subdomain = "autodiscover" fieldtype = "CNAME" target = "mail" } resource "ovh_domain_zone_record" "autoconfig" { zone = var.domain subdomain = "autoconfig" fieldtype = "CNAME" target = "mail" } ``` ## Links (HTM) https://github.com/theobori-cafe/dns