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# external-dns
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ExternalDNS synchronizes exposed Kubernetes Services and Ingresses with DNS providers.
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**Homepage:** <https://github.com/kubernetes-sigs/external-dns/>
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## Maintainers
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| Name | Email | Url |
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| ---- | ------ | --- |
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| stevehipwell | <steve.hipwell@gmail.com> | |
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## Source Code
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* <https://github.com/kubernetes-sigs/external-dns/>
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## Installing the Chart
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Before you can install the chart you will need to add the `external-dns` repo to [Helm](https://helm.sh/).
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```shell
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helm repo add external-dns https://kubernetes-sigs.github.io/external-dns/
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```
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After you've installed the repo you can install the chart.
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```shell
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helm upgrade --install external-dns external-dns/external-dns --version 1.20.0
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```
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## Providers
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> Legacy support of setting `provider: <name>` is deprecated.
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Configuring the _ExternalDNS_ provider should be done via the `provider.name` value with provider specific configuration being set via the `provider.<name>.<key>` values, where supported, and the `extraArgs` value.
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See [documentation](https://kubernetes-sigs.github.io/external-dns/#new-providers) for more info on available providers and tutorials.
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### Providers with Specific Configuration Support
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| Provider | Supported |
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|------------------------|------------|
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| `webhook` | ✅ |
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### Other Providers
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For set up for a specific provider using the Helm chart, see the following links:
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* [AWS](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/aws.md#using-helm-with-oidc)
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* [akamai-edgedns](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/akamai-edgedns.md#using-helm)
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* [cloudflare](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/cloudflare.md#using-helm)
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* [digitalocean](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/digitalocean.md#using-helm)
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* [godaddy](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/godaddy.md#using-helm)
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* [ns1](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/ns1.md#using-helm)
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* [plural](https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/plural.md#using-helm)
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## Namespaced Scoped Installation
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external-dns supports running on a namespaced only scope, too.
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If `namespaced=true` is defined, the helm chart will setup `Roles` and `RoleBindings` instead `ClusterRoles` and `ClusterRoleBindings`.
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### Limited Supported
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Not all sources are supported in namespaced scope, since some sources depends on cluster-wide resources.
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For example: Source `node` isn't supported, since `kind: Node` has scope `Cluster`.
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Sources like `istio-virtualservice` only work, if all resources like `Gateway` and `VirtualService` are present in the same
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namespaces as `external-dns`.
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The annotation `external-dns.alpha.kubernetes.io/endpoints-type: NodeExternalIP` is not supported.
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If `namespaced` is set to `true`, please ensure that `sources` my only contains supported sources (Default: `service,ingress`).
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### Support Matrix
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| Source | Supported | Infos |
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|------------------------|------------|------------------------|
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| `ingress` | ✅ | |
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| `istio-gateway` | ✅ | |
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| `istio-virtualservice` | ✅ | |
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| `crd` | ✅ | |
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| `kong-tcpingress` | ✅ | |
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| `openshift-route` | ✅ | |
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| `skipper-routegroup` | ✅ | |
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| `gloo-proxy` | ✅ | |
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| `contour-httpproxy` | ✅ | |
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| `service` | ⚠️️ | NodePort not supported |
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| `node` | ❌ | |
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| `pod` | ❌ | |
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## Values
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| Key | Type | Default | Description |
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|-----|------|---------|-------------|
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| affinity | object | `{}` | Affinity settings for `Pod` [scheduling](https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/). If an explicit label selector is not provided for pod affinity or pod anti-affinity one will be created from the pod selector labels. |
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| annotationFilter | string | `nil` | Filter resources queried for endpoints by annotation selector. |
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| annotationPrefix | string | `nil` | Annotation prefix for external-dns annotations (useful for split horizon DNS with multiple instances). |
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| automountServiceAccountToken | bool | `true` | Set this to `false` to [opt out of API credential automounting](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#opt-out-of-api-credential-automounting) for the `Pod`. |
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| commonLabels | object | `{}` | Labels to add to all chart resources. |
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| deploymentAnnotations | object | `{}` | Annotations to add to the `Deployment`. |
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| deploymentStrategy | object | `{"type":"Recreate"}` | [Deployment Strategy](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#strategy). |
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| dnsConfig | object | `nil` | [DNS config](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-dns-config) for the pod, if not set the default will be used. |
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| dnsPolicy | string | `nil` | [DNS policy](https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-dns-policy) for the pod, if not set the default will be used. |
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| domainFilters | list | `[]` | Limit possible target zones by domain suffixes. |
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| enabled | bool | `nil` | No effect - reserved for use in sub-charting. |
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| env | list | `[]` | [Environment variables](https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/) for the `external-dns` container. |
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| excludeDomains | list | `[]` | Intentionally exclude domains from being managed. |
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| extraArgs | object | `{}` | Extra arguments to provide to _ExternalDNS_. An array or map can be used, with maps allowing for value overrides; maps also support slice values to use the same arg multiple times. |
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| extraContainers | list | `[]` | Extra containers to add to the `Deployment`. |
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| extraVolumeMounts | list | `[]` | Extra [volume mounts](https://kubernetes.io/docs/concepts/storage/volumes/) for the `external-dns` container. |
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| extraVolumes | list | `[]` | Extra [volumes](https://kubernetes.io/docs/concepts/storage/volumes/) for the `Pod`. |
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| fullnameOverride | string | `nil` | Override the full name of the chart. |
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| gatewayNamespace | string | `nil` | _Gateway API_ gateway namespace to watch. |
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| global.imagePullSecrets | list | `[]` | Global image pull secrets. |
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| image.pullPolicy | string | `"IfNotPresent"` | Image pull policy for the `external-dns` container. |
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| image.repository | string | `"registry.k8s.io/external-dns/external-dns"` | Image repository for the `external-dns` container. |
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| image.tag | string | `nil` | Image tag for the `external-dns` container, this will default to `.Chart.AppVersion` if not set. |
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| imagePullSecrets | list | `[]` | Image pull secrets. |
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| initContainers | list | `[]` | [Init containers](https://kubernetes.io/docs/concepts/workloads/pods/init-containers/) to add to the `Pod` definition. |
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| interval | string | `"1m"` | Interval for DNS updates. |
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| labelFilter | string | `nil` | Filter resources queried for endpoints by label selector. |
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| livenessProbe | object | See _values.yaml_ | [Liveness probe](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/) configuration for the `external-dns` container. |
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| logFormat | string | `"text"` | Log format. |
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| logLevel | string | `"info"` | Log level. |
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| managedRecordTypes | list | `[]` | Record types to manage (default: A, AAAA, CNAME) |
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| nameOverride | string | `nil` | Override the name of the chart. |
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| namespaced | bool | `false` | if `true`, _ExternalDNS_ will run in a namespaced scope (`Role`` and `Rolebinding`` will be namespaced too). |
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| nodeSelector | object | `{}` | Node labels to match for `Pod` [scheduling](https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/). |
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| podAnnotations | object | `{}` | Annotations to add to the `Pod`. |
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| podLabels | object | `{}` | Labels to add to the `Pod`. |
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| podSecurityContext | object | See _values.yaml_ | [Pod security context](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.22/#podsecuritycontext-v1-core), this supports full customisation. |
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| policy | string | `"upsert-only"` | How DNS records are synchronized between sources and providers; available values are `create-only`, `sync`, & `upsert-only`. |
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| priorityClassName | string | `nil` | Priority class name for the `Pod`. |
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| provider.name | string | `"aws"` | _ExternalDNS_ provider name; for the available providers and how to configure them see [README](https://github.com/kubernetes-sigs/external-dns/blob/master/charts/external-dns/README.md#providers). |
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| provider.webhook.args | list | `[]` | Extra arguments to provide for the `webhook` container. |
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| provider.webhook.env | list | `[]` | [Environment variables](https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/) for the `webhook` container. |
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| provider.webhook.extraVolumeMounts | list | `[]` | Extra [volume mounts](https://kubernetes.io/docs/concepts/storage/volumes/) for the `webhook` container. |
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| provider.webhook.image.pullPolicy | string | `"IfNotPresent"` | Image pull policy for the `webhook` container. |
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| provider.webhook.image.repository | string | `nil` | Image repository for the `webhook` container. |
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| provider.webhook.image.tag | string | `nil` | Image tag for the `webhook` container. |
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| provider.webhook.livenessProbe | object | See _values.yaml_ | [Liveness probe](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/) configuration for the `external-dns` container. |
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| provider.webhook.readinessProbe | object | See _values.yaml_ | [Readiness probe](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/) configuration for the `webhook` container. |
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| provider.webhook.resources | object | `{}` | [Resources](https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/) for the `webhook` container. |
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| provider.webhook.securityContext | object | See _values.yaml_ | [Pod security context](https://kubernetes.io/docs/tasks/configure-pod-container/security-context/#set-the-security-context-for-a-container) for the `webhook` container. |
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| provider.webhook.service.port | int | `8080` | Webhook exposed HTTP port for the service. |
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| provider.webhook.serviceMonitor | object | See _values.yaml_ | Optional [Service Monitor](https://prometheus-operator.dev/docs/operator/design/#servicemonitor) configuration for the `webhook` container. |
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| rbac.additionalPermissions | list | `[]` | Additional rules to add to the `ClusterRole`. |
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| rbac.create | bool | `true` | If `true`, create a `ClusterRole` & `ClusterRoleBinding` with access to the Kubernetes API. |
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| readinessProbe | object | See _values.yaml_ | [Readiness probe](https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/) configuration for the `external-dns` container. |
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| registry | string | `"txt"` | Specify the registry for storing ownership and labels. Valid values are `txt`, `aws-sd`, `dynamodb` & `noop`. |
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| resources | object | `{}` | [Resources](https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/) for the `external-dns` container. |
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| revisionHistoryLimit | int | `nil` | Specify the number of old `ReplicaSets` to retain to allow rollback of the `Deployment``. |
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| secretConfiguration.data | object | `{}` | `Secret` data. |
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| secretConfiguration.enabled | bool | `false` | If `true`, create a `Secret` to store sensitive provider configuration (**DEPRECATED**). |
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| secretConfiguration.mountPath | string | `nil` | Mount path for the `Secret`, this can be templated. |
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| secretConfiguration.subPath | string | `nil` | Sub-path for mounting the `Secret`, this can be templated. |
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| securityContext | object | See _values.yaml_ | [Security context](https://kubernetes.io/docs/tasks/configure-pod-container/security-context/#set-the-security-context-for-a-container) for the `external-dns` container. |
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| service.annotations | object | `{}` | Service annotations. |
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| service.ipFamilies | list | `[]` | Service IP families (e.g. IPv4 and/or IPv6). |
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| service.ipFamilyPolicy | string | `nil` | Service IP family policy. |
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| service.port | int | `7979` | Service HTTP port. |
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| serviceAccount.annotations | object | `{}` | Annotations to add to the service account. Templates are allowed in both the key and the value. Example: `example.com/annotation/{{ .Values.nameOverride }}: {{ .Values.nameOverride }}` |
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| serviceAccount.automountServiceAccountToken | bool | `true` | Set this to `false` to [opt out of API credential automounting](https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/#opt-out-of-api-credential-automounting) for the `ServiceAccount`. |
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| serviceAccount.create | bool | `true` | If `true`, create a new `ServiceAccount`. |
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| serviceAccount.labels | object | `{}` | Labels to add to the service account. |
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| serviceAccount.name | string | `nil` | If this is set and `serviceAccount.create` is `true` this will be used for the created `ServiceAccount` name, if set and `serviceAccount.create` is `false` then this will define an existing `ServiceAccount` to use. |
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| serviceMonitor.additionalLabels | object | `{}` | Additional labels for the `ServiceMonitor`. |
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| serviceMonitor.annotations | object | `{}` | Annotations to add to the `ServiceMonitor`. |
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| serviceMonitor.bearerTokenFile | string | `nil` | Provide a bearer token file for the `ServiceMonitor`. |
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| serviceMonitor.enabled | bool | `false` | If `true`, create a `ServiceMonitor` resource to support the _Prometheus Operator_. |
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| serviceMonitor.interval | string | `nil` | If set override the _Prometheus_ default interval. |
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| serviceMonitor.metricRelabelings | list | `[]` | [Metric relabel configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#metric_relabel_configs) to apply to samples before ingestion. |
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| serviceMonitor.namespace | string | `nil` | If set create the `ServiceMonitor` in an alternate namespace. |
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| serviceMonitor.relabelings | list | `[]` | [Relabel configs](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config) to apply to samples before ingestion. |
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| serviceMonitor.scheme | string | `nil` | If set overrides the _Prometheus_ default scheme. |
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| serviceMonitor.scrapeTimeout | string | `nil` | If set override the _Prometheus_ default scrape timeout. |
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| serviceMonitor.targetLabels | list | `[]` | Provide target labels for the `ServiceMonitor`. |
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| serviceMonitor.tlsConfig | object | `{}` | Configure the `ServiceMonitor` [TLS config](https://github.com/coreos/prometheus-operator/blob/master/Documentation/api.md#tlsconfig). |
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| shareProcessNamespace | bool | `false` | If `true`, the `Pod` will have [process namespace sharing](https://kubernetes.io/docs/tasks/configure-pod-container/share-process-namespace/) enabled. |
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| sources | list | `["service","ingress"]` | _Kubernetes_ resources to monitor for DNS entries. |
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| terminationGracePeriodSeconds | int | `nil` | Termination grace period for the `Pod` in seconds. |
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| tolerations | list | `[]` | Node taints which will be tolerated for `Pod` [scheduling](https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/). |
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| topologySpreadConstraints | list | `[]` | Topology spread constraints for `Pod` [scheduling](https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/). If an explicit label selector is not provided one will be created from the pod selector labels. |
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| triggerLoopOnEvent | bool | `false` | If `true`, triggers run loop on create/update/delete events in addition of regular interval. |
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| txtOwnerId | string | `nil` | Specify an identifier for this instance of _ExternalDNS_ when using a registry other than `noop`. |
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| txtPrefix | string | `nil` | Specify a prefix for the domain names of TXT records created for the `txt` registry. Mutually exclusive with `txtSuffix`. |
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| txtSuffix | string | `nil` | Specify a suffix for the domain names of TXT records created for the `txt` registry. Mutually exclusive with `txtPrefix`. |
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----------------------------------------------
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Autogenerated from chart metadata using [helm-docs](https://github.com/norwoodj/helm-docs/).
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