DNS Records

Common record types

Type	Use case	Example
A	IPv4 address	api → 1.2.3.4
AAAA	IPv6 address	api → 2606::1
CNAME	Alias to another hostname	docs → tunght.github.io
MX	Mail exchange	@ → mail.example.com
TXT	Verification, SPF, DKIM	@ → v=spf1 include:...

GitHub Pages setup

Type   Name   Content                    Proxy
CNAME  docs   tunght.github.io           DNS only (grey cloud)

Custom domain on GitHub Pages

GitHub Pages requires the DNS record to be unproxied (grey cloud) when using a CNAME. Proxying breaks the SSL certificate validation flow.

After pointing DNS, go to your repository → Settings → Pages → Custom domain and enter docs.huynhthientung.com.

SPF / DKIM / DMARC

TXT  @    v=spf1 include:_spf.google.com ~all
TXT  docs v=DMARC1; p=quarantine; rua=mailto:dmarc@huynhthientung.com

Terraform (via Cloudflare provider)

resource "cloudflare_record" "docs_cname" {
  zone_id = var.cloudflare_zone_id
  name    = "docs"
  type    = "CNAME"
  value   = "tunght.github.io"
  proxied = false
  ttl     = 1  # auto when proxied=false
}