ExternalDNS Helm Chart
ExternalDNS synchronizes exposed Kubernetes Services and Ingresses with DNS providers. The ExternalDNS Helm chart automates deployment and configuration of ExternalDNS in Kubernetes clusters using the Minimus ExternalDNS image.
Prerequisites
- A subscription to the Minimus images included in the chart
- A running Kubernetes cluster (v1.21 or higher is recommended)
kubectl installed and configured- Helm v3.8 or higher for OCI support (Installation instructions)
- Cluster Admin privileges
Note: ExternalDNS requires access to a DNS provider (AWS Route53, Google Cloud DNS, Azure DNS, Cloudflare, etc.) to manage DNS records. For testing without a real DNS provider, you can use the inmemory provider by overriding the chart defaults (see Step 3).
Try It Out
In this example we will deploy ExternalDNS on a Kubernetes cluster using the Minimus ExternalDNS Helm chart. ExternalDNS will automatically create and manage DNS records for your Kubernetes Services and Ingresses.
Step 1: Start Cluster
If you have a cluster to work with, skip this step. Otherwise, start a Minikube cluster. Deployment instructions
Step 2: Create Namespace
Create a namespace:
kubectl create ns external-dns
Step 3: Deploy the Helm Chart
Deploy the Minimus Helm chart:
helm install my-external-dns oci://helm.mini.dev/external-dns \
--version 1.19.0 \
-n external-dns \
--wait
If you want to override the chart's defaults, go to the Values tab, save a copy locally with your changes. Deploy the chart with your overrides using -f values.yaml:
helm install my-external-dns oci://helm.mini.dev/external-dns \
--version 1.19.0 \
-f values.yaml \
-n external-dns \
--wait
For testing with the inmemory provider (no real DNS provider required), create a values.yaml with:
external-dns:
provider:
name: inmemory
txtOwnerId: external-dns-test
interval: 5s
domainFilters:
- internal.example.org
Step 4: Verify ExternalDNS is Running
Confirm the chart deployed successfully and ExternalDNS started:
kubectl get pods -n external-dns
You should see output similar to:
NAME READY STATUS RESTARTS AGE
my-external-dns-xxxxxxxxx-xxxxx 1/1 Running 0 2m
Step 5: Test Health Endpoint
Port-forward to the ExternalDNS service and verify the health endpoint responds:
kubectl port-forward svc/my-external-dns -n external-dns 7979:7979
In a separate terminal, test the health endpoint:
curl -sf http://localhost:7979/healthz && echo "ExternalDNS is healthy"
You should see:
Step 6: Clean Up
Uninstall the chart and delete the namespace to remove all resources:
helm uninstall my-external-dns -n external-dns
kubectl delete namespace external-dns
Terms & Info
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Disclaimer
Images are provided "as-is" without warranty of any kind. "Hardened" refers to the security configuration applied at the time of build and does not constitute a guarantee of ongoing security or absence of vulnerabilities. The free tier is provided without support, SLA, or guaranteed patching timelines. Security updates may be applied to paid subscriptions before or instead of free tier images. By pulling or using any image you agree to our Terms of Use.
