OpenShift 4 routes getting created with default *.apps subdomain for custom ingress controller

Issue

• In OpenShift 3, the following router environment variables were available to make sure the route with labels or route created in labeled namespace gets created with a custom domain as per router sharding.

  • ROUTER_OVERRIDE_HOSTNAME
  • ROUTER_SUBDOMAIN

• However, these router variables can't be set in OpenShift 4 as everything is managed by ingress operator and any changes in the deployment config of the router will get reverted back.

• Along with default ingresscontroller, an additional custom ingresscontroller with sharding by using namespace labels is configured. Even after labelling the namespace with correct label, the route gets created with default *.apps subdomain when the hostname with required subdomain in spec.host isn't specified.

$ oc get ingresscontrollers -n openshift-ingress-operator 
NAME                        AGE
custom-ingress-controller   50s
default                     3d17h

$ oc get ingresscontroller default -oyaml -n openshift-ingress-operator
...
spec:
  domain: apps.cluster.domain.com
  endpointPublishingStrategy:
    hostNetwork:
      httpPort: 80
      httpsPort: 443
      protocol: TCP
      statsPort: 1936
    type: HostNetwork
  namespaceSelector:
    matchExpressions:
    - key: route
      operator: NotIn
      values:
      - internal
  replicas: 2
  tuningOptions:
    reloadInterval: 0s

$ oc get ingresscontroller custom-ingress-controller -oyaml -n openshift-ingress-operator
...
spec:
  domain: apps.custom-ingress.example.com
  endpointPublishingStrategy:
    hostNetwork:
      httpPort: 80
      httpsPort: 443
      protocol: TCP
      statsPort: 1936
    type: HostNetwork
  namespaceSelector:
    matchLabels:
      route: internal
  replicas: 1
  tuningOptions:
    reloadInterval: 0s

$ oc label namespace test route="internal"
namespace/test labeled

$ cat route 
kind: Route
apiVersion: route.openshift.io/v1
metadata:
  name: test
  namespace: test
  labels:
    route: internal
spec:
  to:
    kind: Service
    name: httpd-24 
    weight: 100
  port:
    targetPort: 8080-tcp 
  tls:
    termination: edge
  wildcardPolicy: None

$ oc create -f route 
route.route.openshift.io/test created

$ oc get route
NAME   HOST/PORT                                       PATH       SERVICES   PORT       TERMINATION   WILDCARD
test   test-test.apps.cluster.domain.com               httpd-24   8080-tcp   edge          None