Example of using route spec.subdomain

route-subdomain.txt

% # /msg @cluster-bot launch openshift/openshift-apiserver#254,openshift/cluster-ingress-operator#674,openshift/router#357
% oc get dnses.config/cluster -o 'jsonpath={.spec.baseDomain}{"\n"}'
ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
% cat ~/tmp/ingresscontroller-custom.yaml
apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  name: custom
  namespace: openshift-ingress-operator
spec:
  domain: custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
  replicas: 1
  endpointPublishingStrategy:
    type: LoadBalancerService
% oc create -f ~/tmp/ingresscontroller-custom.yaml
ingresscontroller.operator.openshift.io/custom created
% oc adm new-project hello-openshift && oc -n hello-openshift create -f ~/src/github.com/openshift/origin/examples/hello-openshift/hello-pod.json && oc -n hello-openshift expose pod/hello-openshift && oc -n hello-openshift create -f ~/tmp/hello-openshift-route.yaml && oc -n hello-openshift get routes
Created project hello-openshift
pod/hello-openshift created
service/hello-openshift exposed
route.route.openshift.io/hello-openshift-edge created
NAME                   HOST/PORT                                                                                 PATH   SERVICES          PORT    TERMINATION   WILDCARD
hello-openshift-edge   hello-openshift.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com ... 1 more          hello-openshift   <all>   edge          None
% oc -n hello-openshift get routes/hello-openshift-edge -o yaml
apiVersion: route.openshift.io/v1
kind: Route
metadata:
  creationTimestamp: "2021-11-03T00:53:12Z"
  managedFields:
  - apiVersion: route.openshift.io/v1
    fieldsType: FieldsV1
    fieldsV1:
      f:spec:
        f:subdomain: {}
        f:tls:
          .: {}
          f:termination: {}
        f:to:
          f:kind: {}
          f:name: {}
          f:weight: {}
        f:wildcardPolicy: {}
    manager: kubectl-create
    operation: Update
    time: "2021-11-03T00:53:12Z"
  - apiVersion: route.openshift.io/v1
    fieldsType: FieldsV1
    fieldsV1:
      f:spec:
        f:host: {}
      f:status:
        f:ingress: {}
    manager: openshift-router
    operation: Update
    time: "2021-11-03T00:53:12Z"
  name: hello-openshift-edge
  namespace: hello-openshift
  resourceVersion: "27103"
  uid: b1cd4ced-038d-4f93-b30f-eaa1553d0564
spec:
  subdomain: hello-openshift
  tls:
    termination: edge
  to:
    kind: Service
    name: hello-openshift
    weight: 100
  wildcardPolicy: None
status:
  ingress:
  - conditions:
    - lastTransitionTime: "2021-11-03T00:53:12Z"
      status: "True"
      type: Admitted
    host: hello-openshift.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
    routerCanonicalHostname: router-default.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
    routerName: default
    wildcardPolicy: None
  - conditions:
    - lastTransitionTime: "2021-11-03T00:53:12Z"
      status: "True"
      type: Admitted
    host: hello-openshift.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
    routerCanonicalHostname: router-custom.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
    routerName: custom
    wildcardPolicy: None
% nslookup router-default.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
Server:         127.0.0.1
Address:        127.0.0.1#53

Non-authoritative answer:
Name:   router-default.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
Address: 34.121.65.119

% curl -k https://hello-openshift.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com --resolve hello-openshift.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com:443:34.121.65.119
Hello OpenShift!
% nslookup router-custom.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
Server:         127.0.0.1
Address:        127.0.0.1#53

Non-authoritative answer:
Name:   router-custom.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com
Address: 35.238.209.184

% curl -k https://hello-openshift.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com --resolve hello-openshift.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com:443:35.238.209.184
Hello OpenShift!
% # Now try using the default router's domain with the custom router and vice versa.  The following curl commands should fail:
% curl -k -I https://hello-openshift.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com --resolve hello-openshift.apps.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com:443:35.238.209.184
HTTP/1.0 503 Service Unavailable
pragma: no-cache
cache-control: private, max-age=0, no-cache, no-store
content-type: text/html

% curl -k -I https://hello-openshift.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com --resolve hello-openshift.custom.ci-ln-c9vsmcb-72292.origin-ci-int-gce.dev.rhcloud.com:443:34.121.65.119
HTTP/1.0 503 Service Unavailable
pragma: no-cache
cache-control: private, max-age=0, no-cache, no-store
content-type: text/html

%