docs: add DNS example

docs/SUMMARY.md

@@ -10,6 +10,7 @@
   - [Prerequisites](./deployment/prerequisites.md)
   - [Configuration](./deployment/configuration.md)
   - [Deploy the homelab](./deployment/deployment.md)
+  - [DNS setup](./deployment/dns.md)
 - [Troubleshooting](./troubleshooting/README.md)
   - [PXE boot](./troubleshooting/pxe_boot.md)
 - [Reference](./reference/README.md)

docs/deployment/dns.md

@@ -0,0 +1,30 @@
+# DNS setup
+
+Some options for DNS config:
+
+- Change the DNS config in your router
+- Run your own DNS server in the cluster
+- Change the DNS config in your domain registrar
+
+For example here is my set up using the third option with Cloudflare, automated using Terraform:
+
+```hcl
+resource "cloudflare_record" "homelab_records" {
+  for_each = toset([
+    "*.knative",
+    "argocd",
+    "dex",
+    "git",
+    "grafana",
+    "tekton",
+    "vault",
+    # etc.
+  ])
+
+  zone_id = cloudflare_zone.khuedoan_com.id
+  type    = "A"
+  name    = each.key
+  value   = "192.168.1.150"
+  ttl     = 1 # Auto
+}
+```