External-dns

External

• https://github.com/helm/charts/tree/master/stable/external-dns

Internal

• Kubernetes DNS Concepts

Overview

One single deployment can serve multiple services in different namespaces.

Installation

helm repo add bitnami https://charts.bitnami.com/bitnami
helm install -n default external-dns bitnami/external-dns -f ./overlay.yaml

Upon installation:

NAME                             READY   STATUS    RESTARTS   AGE
external-dns-5788c65f8c-7l7kd    1/1     Running   0          60m

Configuration

external-dns Configuration

aws:
  region: us-west-2
registry: txt
policy: upsert-only
txtOwnerId: "Z0000000000000000000"
sources:
  - service
  - ingress
domainFilters:
  - example.com

When the DNS service is Route53, "txtOwnerId" is the ID of the hosted zone. It has other meanings when using a different DNS service.

Service Configuration

apiVersion: v1
kind: Service
metadata:
  annotations:
    external-dns.alpha.kubernetes.io/hostname: 'something.example.com'