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layout title
default ALIAS Records

ALIAS Records

ALIAS records are not widely standardized across DNS providers. Some (Route 53, DNSimple) have a native ALIAS record type. Others (Cloudflare) implement transparent CNAME flattening.

DNSControl adds an ALIAS record type, and leaves it up to the provider implementation to handle it.

A few notes:

  1. A provider must "opt-in" to supporting ALIAS records. When registering a provider, you specify which capabilities you support. Here is an example of how the cloudflare provider declares its support for aliases:
func init() {
	providers.RegisterDomainServiceProviderType("CLOUDFLAREAPI", newCloudflare, providers.CanUseAlias)
}
  1. If you try to use ALIAS records, all dns providers for the domain must support ALIAS records. We do not want to serve inconsistent records across providers.
  2. CNAMEs at @ are disallowed, but ALIAS is allowed.
  3. Cloudflare does not have a native ALIAS type, but CNAMEs behave similarly. The Cloudflare provider "rewrites" ALIAS records to CNAME as it sees them. Other providers may not need this step.