Router Sharding
Router sharding example
Create a new router shared
Take all routes with label type=sharded
oc create -f - <<EOF
apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
name: sharded
namespace: openshift-ingress-operator
spec:
domain: external.demo.openshift.pub
endpointPublishingStrategy:
type: NodePortService
nodePlacement:
nodeSelector:
matchLabels:
node-role.kubernetes.io/worker: ""
routeSelector:
matchLabels:
type: sharded
status: {}
EOF
Adjust default router to skip type: sharded
oc patch \
-n openshift-ingress-operator \
IngressController/default \
--type='merge' \
-p '{"spec":{"routeSelector":{"matchExpressions":[{"key":"type","operator":"NotIn","values":["sharded"]}]}}}'
Dummy routes
oc new-project demo
oc create service clusterip dummy --tcp=8080:8080
oc expose svc/dummy -l type=sharded --name dummy-shared
oc expose svc/dummy --name dummy-default
Check routes
$ oc describe route -n demo dummy-default
Name: dummy-default
Namespace: demo
Created: 2 minutes ago
Labels: app=dummy
Annotations: openshift.io/host.generated=true
Requested Host: dummy-default-demo.apps.demo.openshift.pub
exposed on router default (host apps.demo.openshift.pub) 2 minutes ago
Path: <none>
TLS Termination: <none>
Insecure Policy: <none>
Endpoint Port: 8080-8080
Service: dummy
Weight: 100 (100%)
Endpoints: <none>
$ oc describe route -n demo dummy-shared
Name: dummy-shared
Namespace: demo
Created: 3 minutes ago
Labels: type=sharded
Annotations: openshift.io/host.generated=true
Requested Host: dummy-shared-demo.apps.demo.openshift.pub
exposed on router sharded (host external.demo.openshift.pub) 2 minutes ago
Path: <none>
TLS Termination: <none>
Insecure Policy: <none>
Endpoint Port: 8080-8080
Service: dummy
Weight: 100 (100%)
Endpoints: <none>
$ oc rsh -n openshift-ingress deployment/router-sharded cat os_http_be.map
^dummy-shared-demo\.apps\.demo\.openshift\.pub(:[0-9]+)?(/.*)?$ be_http:demo:dummy-shared
$ oc rsh -n openshift-ingress deployment/router-default cat os_http_be.map
^dummy-default-demo\.apps\.demo\.openshift\.pub(:[0-9]+)?(/.*)?$ be_http:demo:dummy-default
One downside: all routes auto generated with default domain:
$ oc get ingresses.config.openshift.io/cluster -o jsonpath="{.spec.domain}"
apps.demo.openshift.pub