1. Install envoy gateway
helm install eg \
  oci://docker.io/envoyproxy/gateway-helm \
  --version v1.8.2 \
  --namespace envoy-gateway-system \
  --create-namespace
  
2. Wait for the controller to be up
kubectl wait \
  --namespace envoy-gateway-system \
  --for=condition=Available \
  deployment/envoy-gateway \
  --timeout=5m

3. Check CRD exists
kubectl get crd | grep gateway

4. Find out the GatewayClass
kubectl get gatewayclass

4a. if it doesn't exists. create it.
apiVersion: gateway.networking.k8s.io/v1
kind: GatewayClass
metadata:
  name: eg
spec:
  controllerName: gateway.envoyproxy.io/gatewayclass-controller

5. Create the Gateway. create the file and apply it.
apiVersion: gateway.networking.k8s.io/v1
kind: Gateway
metadata:
  name: abc-gateway
  namespace: testing
spec:
  gatewayClassName: eg

  listeners:
    - name: http
      protocol: HTTP
      port: 80

      # Only HTTPRoutes in the same namespace may attach.
      allowedRoutes:
        namespaces:
          from: NAMESPACE
          
6. Check
kubectl get gateway abc-gateway
kubectl describe gateway abc-gateway
Make sure Accepted and Programmed is true

7. Create HTTPRoute.yaml and apply it.
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: abc-route
  namespace: testing
spec:
  parentRefs:
    - name: abc-gateway
      sectionName: http

  hostnames:
    - abc.def.com

  rules:
    - matches:
        - path:
            type: PathPrefix
            value: /

      backendRefs:
        - name: abc
          port: 12345

8. Check
kubectl get httproute
kubectl describe httproute abc-route
Make sure Accepted and ResolvedRefs are true