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Setting up ExternalDNS for Infoblox

This tutorial describes how to setup ExternalDNS for usage with Infoblox.

Make sure to use >=0.4.6 version of ExternalDNS for this tutorial. The only WAPI version that has been validated is v2.3.1. It is assumed that the API user has rights to create objects of the following types: zone_auth, record:a, record:cname, record:txt.

This tutorial assumes you have substituted the correct values for the following environment variables:

export GRID_HOST=127.0.0.1
export WAPI_PORT=443
export WAPI_VERSION=2.3.1
export WAPI_USERNAME=admin
export WAPI_PASSWORD=infoblox

Creating an Infoblox DNS zone

The Infoblox provider for ExternalDNS will find suitable zones for domains it manages; it will not automatically create zones.

Create an Infoblox DNS zone for "example.com":

$ curl -kl \
      -X POST \
      -d fqdn=example.com \
      -u ${WAPI_USERNAME}:${WAPI_PASSWORD} \
         https://${GRID_HOST}:${WAPI_PORT}/wapi/v${WAPI_VERSION}/zone_auth

Substitute a domain you own for "example.com" if desired.

Creating an Infoblox Configuration Secret

For ExternalDNS to access the Infoblox API, create a Kubernetes secret.

To create the secret:

$ kubectl create secret generic external-dns \
      --from-literal=EXTERNAL_DNS_INFOBLOX_WAPI_USERNAME=${WAPI_USERNAME} \
      --from-literal=EXTERNAL_DNS_INFOBLOX_WAPI_PASSWORD=${WAPI_PASSWORD}

Deploy ExternalDNS

Create a deployment file called externaldns.yaml with the following contents:

$ cat > externaldns.yaml <<EOF
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: external-dns
spec:
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: external-dns
    spec:
      containers:
      - name: external-dns
        image: registry.opensource.zalan.do/teapot/external-dns:v0.4.8
        args:
        - --source=service
        - --domain-filter=example.com       # (optional) limit to only example.com domains.
        - --provider=infoblox
        - --infoblox-grid-host=${GRID_HOST} # (required) IP of the Infoblox Grid host.
        - --infoblox-wapi-port=443          # (optional) Infoblox WAPI port. The default is "443".
        - --infoblox-wapi-version=2.3.1     # (optional) Infoblox WAPI version. The default is "2.3.1"
        - --infoblox-ssl-verify             # (optional) Use --no-infoblox-ssl-verify to skip server certificate verification.
        env:
        - name: EXTERNAL_DNS_INFOBLOX_HTTP_POOL_CONNECTIONS
          value: "10" # (optional) Infoblox WAPI request connection pool size. The default is "10".
        - name: EXTERNAL_DNS_INFOBLOX_HTTP_REQUEST_TIMEOUT
          value: "60" # (optional) Infoblox WAPI request timeout in seconds. The default is "60".
        - name: EXTERNAL_DNS_INFOBLOX_WAPI_USERNAME
          valueFrom:
            secretKeyRef:
              name: external-dns
              key: EXTERNAL_DNS_INFOBLOX_WAPI_USERNAME
        - name: EXTERNAL_DNS_INFOBLOX_WAPI_PASSWORD
          valueFrom:
            secretKeyRef:
              name: external-dns
              key: EXTERNAL_DNS_INFOBLOX_WAPI_PASSWORD
EOF

Create the deployment for ExternalDNS:

$ kubectl create -f externaldns.yaml

Deploying an Nginx Service

Create a service file called 'nginx.yaml' with the following contents:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx
spec:
  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 Infoblox DNS zone created above. The annotation may also be a subdomain of the DNS zone (e.g. 'www.example.com').

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

It takes a little while for the Infoblox cloud provider to create an external IP for the service. Check the status by running kubectl get services nginx. If the EXTERNAL-IP field shows an address, the service is ready to be accessed externally.

Once the service has an external IP assigned, ExternalDNS will notice the new service IP address and synchronize the Infoblox DNS records.

Verifying Infoblox DNS records

Run the following command to view the A records for your Infoblox DNS zone:

$ curl -kl \
      -X GET \
      -u ${WAPI_USERNAME}:${WAPI_PASSWORD} \
         https://${GRID_HOST}:${WAPI_PORT}/wapi/v${WAPI_VERSION}/record:a?zone=example.com

Substitute the zone for the one created above if a different domain was used.

This should show the external IP address of the service as the A record for your domain ('@' indicates the record is for the zone itself).

Clean up

Now that we have verified that ExternalDNS will automatically manage Infoblox DNS records, we can delete the tutorial's DNS zone:

$ curl -kl \
      -X DELETE \
      -u ${WAPI_USERNAME}:${WAPI_PASSWORD} \
         https://${GRID_HOST}:${WAPI_PORT}/wapi/v${WAPI_VERSION}/zone_auth?fqdn=example.com