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| Original file line number | Diff line number | Diff line change |
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| # Setting up ExternalDNS for Services on Plural | ||
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| This tutorial describes how to setup ExternalDNS for usage within a Kubernetes cluster using Plural DNS. | ||
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| Make sure to use **>=0.12.3** version of ExternalDNS for this tutorial. | ||
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| ## Creating Plural Credentials | ||
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| A secret containing the a Plural access token is needed for this provider. You can get a token for your user [here](https://app.plural.sh/profile/tokens). | ||
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| To create the secret you can run `kubectl create secret generic plural-env --from-literal=PLURAL_ACCESS_TOKEN=<replace-with-your-access-token>`. | ||
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| ## Deploy ExternalDNS | ||
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| Connect your `kubectl` client to the cluster you want to test ExternalDNS with. | ||
| Then apply one of the following manifests file to deploy ExternalDNS. | ||
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| ### Manifest (for clusters without RBAC enabled) | ||
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| ```yaml | ||
| apiVersion: apps/v1 | ||
| kind: Deployment | ||
| metadata: | ||
| name: external-dns | ||
| spec: | ||
| strategy: | ||
| type: Recreate | ||
| selector: | ||
| matchLabels: | ||
| app: external-dns | ||
| template: | ||
| metadata: | ||
| labels: | ||
| app: external-dns | ||
| spec: | ||
| containers: | ||
| - name: external-dns | ||
| image: k8s.gcr.io/external-dns/external-dns:v0.7.6 | ||
| args: | ||
| - --source=service # ingress is also possible | ||
| - --domain-filter=example.com # (optional) limit to only example.com domains; change to match the zone created above. | ||
| - --provider=plural | ||
| - --plural-cluster=example-plural-cluster | ||
| - --plural-provider=aws # gcp, azure, equinix and kind are also possible | ||
| env: | ||
| - name: PLURAL_ACCESS_TOKEN | ||
| valueFrom: | ||
| secretKeyRef: | ||
| key: PLURAL_ACCESS_TOKEN | ||
| name: plural-env | ||
| - name: PLURAL_ENDPOINT # (optional) use an alternative endpoint for Plural; defaults to https://app.plural.sh | ||
| value: https://app.plural.sh | ||
| ``` | ||
| ### Manifest (for clusters with RBAC enabled) | ||
| ```yaml | ||
| apiVersion: v1 | ||
| kind: ServiceAccount | ||
| metadata: | ||
| name: external-dns | ||
| --- | ||
| apiVersion: rbac.authorization.k8s.io/v1 | ||
| kind: ClusterRole | ||
| metadata: | ||
| name: external-dns | ||
| rules: | ||
| - apiGroups: [""] | ||
| resources: ["services","endpoints","pods"] | ||
| verbs: ["get","watch","list"] | ||
| - apiGroups: ["extensions","networking.k8s.io"] | ||
| resources: ["ingresses"] | ||
| verbs: ["get","watch","list"] | ||
| - apiGroups: [""] | ||
| resources: ["nodes"] | ||
| verbs: ["list", "watch"] | ||
| --- | ||
| apiVersion: rbac.authorization.k8s.io/v1 | ||
| kind: ClusterRoleBinding | ||
| metadata: | ||
| name: external-dns-viewer | ||
| roleRef: | ||
| apiGroup: rbac.authorization.k8s.io | ||
| kind: ClusterRole | ||
| name: external-dns | ||
| subjects: | ||
| - kind: ServiceAccount | ||
| name: external-dns | ||
| namespace: default | ||
| --- | ||
| apiVersion: apps/v1 | ||
| kind: Deployment | ||
| metadata: | ||
| name: external-dns | ||
| spec: | ||
| strategy: | ||
| type: Recreate | ||
| selector: | ||
| matchLabels: | ||
| app: external-dns | ||
| template: | ||
| metadata: | ||
| labels: | ||
| app: external-dns | ||
| spec: | ||
| containers: | ||
| - name: external-dns | ||
| image: k8s.gcr.io/external-dns/external-dns:v0.7.6 | ||
| args: | ||
| - --source=service # ingress is also possible | ||
| - --domain-filter=example.com # (optional) limit to only example.com domains; change to match the zone created above. | ||
| - --provider=plural | ||
| - --plural-cluster=example-plural-cluster | ||
| - --plural-provider=aws # gcp, azure, equinix and kind are also possible | ||
| env: | ||
| - name: PLURAL_ACCESS_TOKEN | ||
| valueFrom: | ||
| secretKeyRef: | ||
| key: PLURAL_ACCESS_TOKEN | ||
| name: plural-env | ||
| - name: PLURAL_ENDPOINT # (optional) use an alternative endpoint for Plural; defaults to https://app.plural.sh | ||
| value: https://app.plural.sh | ||
| ``` | ||
| ## Deploying an Nginx Service | ||
| Create a service file called 'nginx.yaml' with the following contents: | ||
| ```yaml | ||
| apiVersion: apps/v1 | ||
| kind: Deployment | ||
| metadata: | ||
| name: nginx | ||
| spec: | ||
| selector: | ||
| matchLabels: | ||
| app: nginx | ||
| template: | ||
| metadata: | ||
| labels: | ||
| app: nginx | ||
| spec: | ||
| containers: | ||
| - image: nginx | ||
| name: nginx | ||
| ports: | ||
| - containerPort: 80 | ||
| --- | ||
| apiVersion: v1 | ||
| kind: Service | ||
| metadata: | ||
| name: nginx | ||
| annotations: | ||
| external-dns.alpha.kubernetes.io/hostname: example.com | ||
| spec: | ||
| selector: | ||
| app: nginx | ||
| type: LoadBalancer | ||
| ports: | ||
| - protocol: TCP | ||
| port: 80 | ||
| targetPort: 80 | ||
| ``` | ||
| Note the annotation on the service; use the same hostname as the Plural DNS zone created above. The annotation may also be a subdomain | ||
| of the DNS zone (e.g. 'www.example.com'). | ||
| By setting the TTL annotation on the service, you have to pass a valid TTL, which must be 120 or above. | ||
| This annotation is optional, if you won't set it, it will be 1 (automatic) which is 300. | ||
| ExternalDNS uses this annotation to determine what services should be registered with DNS. Removing the annotation | ||
| will cause ExternalDNS to remove the corresponding DNS records. | ||
| Create the deployment and service: | ||
| ``` | ||
| $ kubectl create -f nginx.yaml | ||
| ``` | ||
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| Depending where you run your service it can take a little while for your cloud provider to create an external IP for the service. | ||
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| Once the service has an external IP assigned, ExternalDNS will notice the new service IP address and synchronize | ||
| the Plural DNS records. | ||
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| ## Verifying Plural DNS records | ||
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| Check your [Plural domain overview](https://app.plural.sh/account/domains) to view the domains associated with your Plural account. There you can view the records for each domain. | ||
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| The records should show the external IP address of the service as the A record for your domain. | ||
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| ## Cleanup | ||
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| Now that we have verified that ExternalDNS will automatically manage Plural DNS records, we can delete the tutorial's example: | ||
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| ``` | ||
| $ kubectl delete -f nginx.yaml | ||
| $ kubectl delete -f externaldns.yaml |
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