Openshift Dedicated Custom Domain Operator

This operator sets up a new ingresscontroller with custom certificate as a day-2 operation. The public DNS record of this new ingresscontroller can then be used by external DNS to create a wildcard CNAME record to for a custom domain.

On cluster, a CustomDomain custom resource creates an IngressController, which creates a set of router pods.

graph LR
  A[customdomains] --> B[ingresscontrollers]
  subgraph openshift-ingress-controller
  B
  end
  B --> C[Router pods]
  subgraph openshift-ingress
  C
  end

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Prerequisites

• Go 1.17+
• Operator-SDK v1.21+

Building And Deploying

Setup

Create Custom Resource Definition (CRD)

oc apply -f deploy/crds/managed.openshift.io_customdomains_crd.yaml

Run locally outside of cluster

operator-sdk run --local --namespace ''

Build and Deploy To Cluster

Choose public container registry e.g. 'quay.io/acme'. Build and push the image, then update the operator deployment manifest.

Example:

# deploy manifests
oc apply -f deploy/crds/managed.openshift.io_customdomains.yaml
oc apply -f deploy/
# build
make docker-build docker-push
# update image with image in build output
oc set image -n openshift-custom-domains-operator deployment/custom-domains-operator custom-domains-operator=quay.io/dustman9000/custom-domains-operator:v0.1.29-a48b301e

Testing

See TESTING