The provider has been written for and tested against PowerDNS v4.1.x and thus requires PowerDNS Auth Server >= 4.1.x
PowerDNS provider support was added via this PR, thus you need to use external-dns version >= v0.5
The PDNS provider expects that your PowerDNS instance is already setup and functional. It expects that zones, you wish to add records to, already exist and are configured correctly. It does not add, remove or configure new zones in anyway.
The PDNS provider currently does not support:
- Dry running a configuration is not supported
Deploying external DNS for PowerDNS is actually nearly identical to deploying
it for other providers. This is what a sample deployment.yaml
looks like:
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:
# Only use if you're also using RBAC
# serviceAccountName: external-dns
containers:
- name: external-dns
image: k8s.gcr.io/external-dns/external-dns:v0.7.3
args:
- --source=service # or ingress or both
- --provider=pdns
- --pdns-server={{ pdns-api-url }}
- --pdns-api-key={{ pdns-http-api-key }}
- --txt-owner-id={{ owner-id-for-this-external-dns }}
- --domain-filter=external-dns-test.my-org.com # will make ExternalDNS see only the zones matching provided domain; omit to process all available zones in PowerDNS
- --log-level=debug
- --interval=30s
When the domain-filter argument is specified, external-dns will automatically create DNS records based on host names specified in ingress objects and services with the external-dns annotation that match the domain-filter argument in the external-dns deployment manifest.
eg. --domain-filter=example.org
will allow for zone example.org
and any zones in PowerDNS that ends in .example.org
, including an.example.org
, ie. the subdomains of example.org.
eg. --domain-filter=.example.org
will allow only zones that end in .example.org
, ie. the subdomains of example.org but not the example.org
zone itself.
If your cluster is RBAC enabled, you also need to setup the following, before you can run external-dns:
apiVersion: v1
kind: ServiceAccount
metadata:
name: external-dns
---
apiVersion: rbac.authorization.k8s.io/v1beta1
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: ["pods"]
verbs: ["get","watch","list"]
- apiGroups: [""]
resources: ["nodes"]
verbs: ["list"]
---
apiVersion: rbac.authorization.k8s.io/v1beta1
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
Important!: Remember to change example.com
with your own domain throughout the following text.
Spin up a simple "Hello World" HTTP server with the following spec (kubectl apply -f
):
apiVersion: apps/v1
kind: Deployment
metadata:
name: echo
spec:
selector:
matchLabels:
app: echo
template:
metadata:
labels:
app: echo
spec:
containers:
- image: hashicorp/http-echo
name: echo
ports:
- containerPort: 5678
args:
- -text="Hello World"
---
apiVersion: v1
kind: Service
metadata:
name: echo
annotations:
external-dns.alpha.kubernetes.io/hostname: echo.example.com
spec:
selector:
app: echo
type: LoadBalancer
ports:
- protocol: TCP
port: 80
targetPort: 5678
Important!: Don't run dig, nslookup or similar immediately (until you've confirmed the record exists). You'll get hit by negative DNS caching, which is hard to flush.
Run the following to make sure everything is in order:
$ kubectl get services echo
$ kubectl get endpoints echo
Make sure everything looks correct, i.e the service is defined and receives a public IP, and that the endpoint also has a pod IP.
Once that's done, wait about 30s-1m (interval for external-dns to kick in), then do:
$ curl -H "X-API-Key: ${PDNS_API_KEY}" ${PDNS_API_URL}/api/v1/servers/localhost/zones/example.com. | jq '.rrsets[] | select(.name | contains("echo"))'
Once the API shows the record correctly, you can double check your record using:
$ dig @${PDNS_FQDN} echo.example.com.