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Setting up external-dns for BlueCat

The first external-dns release with with BlueCat provider support is v0.8.0.

Prerequisites

Install the BlueCat Gateway product and deploy the community gateway workflows.

Configuration Options

There are two ways to pass configuration options to the Bluecat Provider JSON configuration file and command line flags. Currently if a valid configuration file is used all BlueCat provider configurations will be taken from the configuration file. If a configuraiton file is not provided or cannot be read then all BlueCat provider configurations will be taken from the command line flags. In the future an enhancement will be made to merge configuration options from the configuration file and command line flags if both are provided.

BlueCat provider supports getting the proxy URL from the environment variables. The format is the one specified by golang's http.ProxyFromEnvironment.

Using CLI Flags

When using CLI flags to configure the Bluecat Provider the BlueCat Gateway credentials are passed in using environment variables BLUECAT_USERNAME and BLUECAT_PASSWORD.

Deploy

Setup up namespace, deployment, and service account:

kubectl create namespace bluecat-example
kubectl create secret generic bluecat-credentials --from-literal=username=bluecatuser --from-literal=password=bluecatpassword -n bluecat-example
cat << EOF > ~/bluecat.yml
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: external-dns
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: external-dns
spec:
  selector:
    matchLabels:
      app: external-dns
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: external-dns
    spec:
      serviceAccountName: external-dns
      containers:
      - name: external-dns
        image: registry.k8s.io/external-dns/external-dns:v0.13.2
        args:
        - --log-level=debug
        - --source=service
        - --provider=bluecat
        - --txt-owner-id=bluecat-example
        - --bluecat-dns-configuration=Example
        - --bluecat-dns-view=Internal
        - --bluecat-gateway-host=https://bluecatgw.example.com
        - --bluecat-root-zone=example.com
        env:
        - name: BLUECAT_USERNAME
          valueFrom:
            secretKeyRef:
              name: bluecat-credentials
              key: username
        - name: BLUECAT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: bluecat-credentials
              key: password
EOF
kubectl apply -f ~/bluecat.yml -n bluecat-example

Using JSON Configuration File

The options for configuring the Bluecat Provider are available through the JSON file provided to External-DNS via the flag --bluecat-config-file.

Key Required
gatewayHost Yes
gatewayUsername No
gatewayPassword No
dnsConfiguration Yes
dnsView Yes
rootZone Yes
dnsServerName No
dnsDeployType No
skipTLSVerify No (default false)

Deploy

Setup configuration file as k8s Secret.

cat << EOF > ~/bluecat.json
{
  "gatewayHost": "https://bluecatgw.example.com",
  "gatewayUsername": "user",
  "gatewayPassword": "pass",
  "dnsConfiguration": "Example",
  "dnsView": "Internal",
  "rootZone": "example.com",
  "skipTLSVerify": false
}
EOF
kubectl create secret generic bluecatconfig --from-file ~/bluecat.json -n bluecat-example

Setup up namespace, deployment, and service account:

kubectl create namespace bluecat-example
cat << EOF > ~/bluecat.yml
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: external-dns
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: external-dns
spec:
  selector:
    matchLabels:
      app: external-dns
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: external-dns
    spec:
      serviceAccountName: external-dns
      volumes:
        - name: bluecatconfig
          secret:
            secretName: bluecatconfig
      containers:
      - name: external-dns
        image: registry.k8s.io/external-dns/external-dns:v0.13.2
        volumeMounts:
          - name: bluecatconfig
            mountPath: "/etc/external-dns/"
            readOnly: true
        args:
        - --log-level=debug
        - --source=service
        - --provider=bluecat
        - --txt-owner-id=bluecat-example
        - --bluecat-config-file=/etc/external-dns/bluecat.json
EOF
kubectl apply -f ~/bluecat.yml -n bluecat-example