\n\n# ExternalDNS Advanced Helm Chart\n\nExternalDNS is a Kubernetes add-on that automatically synchronizes exposed Kubernetes Services and Ingresses with DNS providers. It allows you to control DNS records dynamically via Kubernetes resources in a DNS provider-agnostic way. The ExternalDNS Advanced Helm chart automates deployment and configuration of ExternalDNS in Kubernetes clusters using the Minimus ExternalDNS Advanced image with hardened security and production-grade configuration.\n\n\n## {{icon-list-search}} Prerequisites\n\n- A subscription to the Minimus images included in the chart\n- A running Kubernetes cluster (v1.21 or higher is recommended)\n- `kubectl` installed and configured\n- Helm v3.8 or higher for OCI support ([Installation instructions](https://helm.sh/docs/intro/install/))\n- Cluster Admin privileges\n\n**Note**: This example uses the inmemory provider for testing, which does not require access to a real DNS provider. For production use, you'll need access to a DNS provider (AWS Route53, Google Cloud DNS, Azure DNS, Cloudflare, etc.)\n\n\n

\n\n---\n\n

\n \n## {{icon-rocket}}Try It Out\n\nIn this example we will deploy ExternalDNS on a Kubernetes cluster using the Minimus ExternalDNS Advanced Helm chart. ExternalDNS will automatically create DNS records for Services and Ingresses based on annotations.\n\n\n

\n\n### Step 1: Start Cluster\n\n

\n\n\nIf you have a cluster to work with, skip this step. Otherwise, start a Minikube cluster. [Deployment instructions](https://minikube.sigs.k8s.io/docs/start/?arch=%2Flinux%2Fx86-64%2Fstable%2Fbinary+download)\n\n

\n\n### Step 2: Create Namespace\n\n

\n\nCreate a namespace:\n\n```\nkubectl create ns external-dns-advanced\n```\n\n{{if-enterprise}}\n\nNext, create a Kubernetes secret for the Minimus token:\n\n```\nkubectl create secret docker-registry minimus-registry \\\n --docker-server=reg.mini.dev \\\n --docker-username=minimus \\\n --docker-password={{pull-token}} \\\n --namespace=external-dns-advanced\n```\n\n{{/if-enterprise}}\n\n

\n\n### Step 3: Save Values File Locally \n\n

\n\nGo to the Values tab and save a copy of it locally. You will need to add the flag `-f values.yaml` to override the defaults when you deploy the chart in the next step.\n\nFor testing with the inmemory provider, update your `values.yaml` to include:\n\n```yaml\nexternal-dns:\n provider:\n name: inmemory\n txtOwnerId: external-dns-test\n interval: 5s\n domainFilters:\n - internal.example.org\n```\n\n\n

\n\n### Step 4: Deploy the Helm Chart\n\n

\n\nDeploy the Minimus Helm chart with the values.yaml file you saved in the previous step:\n\n```\nhelm install my-external-dns-advanced {{oci-url}} \\\n --version {{chart-version}} \\\n -f values.yaml \\\n -n external-dns-advanced \\\n --wait\n```\n\n

\n\n### Step 5: Verify ExternalDNS is Running\n\n

\n\nTo check that the pod was successfully created run:\n\n```\nkubectl get pods -n external-dns-advanced -l app.kubernetes.io/name=external-dns\n```\n\nYou should see output similar to:\n\n```\nNAME READY STATUS RESTARTS AGE\nmy-external-dns-advanced-xxxxxxxxx 1/1 Running 0 2m\n```\n\n

\n\n### Step 6: Create a Test Service\n\n

\n\nCreate a `test-service` and discover its IP:\n\n```\nkubectl create service clusterip test-service --tcp=80:80 -n external-dns-advanced\nTEST_SERVICE_IP=$(kubectl get svc test-service -o jsonpath='{.spec.clusterIP}' -n external-dns-advanced)\necho TEST_SERVICE_IP=${TEST_SERVICE_IP}\n```\n\n

\n\n### Step 7: Make the Service Discoverable\n\n

\n\nFirst, add variables:\n\n```\nTEST_DOMAIN=\"internal.example.org\"\nTEST_SERVICE_NAME=\"test-service\"\nINTERNAL_SERVICE_NAME=\"${TEST_SERVICE_NAME}.${TEST_DOMAIN}\"\n```\n\nAnnotate the `test-service` to make it discoverable by external-dns:\n\n```\nkubectl annotate service test-service \\\n -n external-dns-advanced \\\n external-dns.alpha.kubernetes.io/internal-hostname=\"${INTERNAL_SERVICE_NAME}\"\n```\n\n

\n\n### Step 8: Verify DNS Record Creation\n\n

\n\nWait 5-10 seconds for ExternalDNS to discover and process the test-service.\n\nSince we deployed ExternalDNS with the inmemory provider in the values.yaml file, it will not interact with a real DNS provider. To confirm that a service has been processed, check the pod's logs:\n\n```\nkubectl logs deployment/my-external-dns-advanced -n external-dns-advanced | \\\ngrep \"CREATE: ${INTERNAL_SERVICE_NAME} 0 IN A\" | \\\ngrep ${TEST_SERVICE_IP} && echo Success\n```\n\nThe logs should print the URL of the internal test-service: `test-service.internal.example.org`, for example:\n\n```output\ntime=\"2025-09-26T11:35:54Z\" level=info msg=\"CREATE: test-service.internal.example.org 0 IN A 10.96.209.17 []\"\n```\n\n

\n\n### Step 9: Clean Up\n\n

\n\nUninstall the chart and delete the namespace to remove all resources, including Pods, Deployments, Services, Secrets, ConfigMaps, etc.:\n\n```bash\nhelm uninstall my-external-dns-advanced -n external-dns-advanced\nkubectl delete namespace external-dns-advanced\n```\n\n

\n\n\n\n---\n\n

\n\n## {{icon-info-circle}}Terms & Info\n\n

\n\n### Trademark\n\n

\n\nThis catalog is published by Minimus. All product names, logos, and marks, other than those belonging to Minimus, shown are owned by their respective rights holders and appear here only to identify the open source software each image contains. Minimus claims no ownership of those marks and implies no affiliation with, endorsement by, certification by, or sponsorship by any rights holder.\n\n\n{{if-anonymous}} \n\n

\n\n### Disclaimer\n\n

\n\n\nImages 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](https://www.minimus.io/terms-of-use).\n\n{{/if-anonymous}}\n\n\n

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