External DNS

Purpose: Automatic DNS record synchronization

Version: v1.0.0 (Helm chart: external-dns/external-dns)

Namespace: external-dns

Description

Automatically creates and manages DNS records based on Kubernetes ingress resources. Integrates with Cloudflare for DNS management.

Installation

Installed via ArgoCD from Helm chart: external-dns/external-dns

Configuration

Configuration file: config/dev/applications/external-dns-values.yaml

provider: cloudflare
registry: txt
txtOwnerId: k8s
domainFilters:
  - ssdk8s.xyz
sources:
  - ingress
policy: sync

DNS Provider

• Provider: Cloudflare
• Domain: ssdk8s.xyz

Prerequisites

Cloudflare API token stored as secret:

kubectl create secret generic cloudflare-api-token \
  -n external-dns \
  --from-literal=api-token=YOUR_CF_API_TOKEN

How It Works

1. Create an Ingress resource
2. ExternalDNS watches for ingress changes
3. Automatically creates/updates DNS records in Cloudflare

Example

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: my-app
  annotations:
    external-dns.alpha.kubernetes.io/hostname: myapp.ssdk8s.xyz
    external-dns.alpha.kubernetes.io/ttl: "300"
spec:
  ingressClassName: nginx
  rules:
    - host: myapp.ssdk8s.xyz
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: my-service
                port:
                  number: 80

Annotations

Annotation	Description	Default
external-dns.alpha.kubernetes.io/hostname	DNS name to create	-
external-dns.alpha.kubernetes.io/ttl	TTL for DNS record	300
external-dns.alpha.kubernetes.io/ingress-class	Ingress class to watch	all