Istio installation using docs “https://istio.io/docs/setup/platform-setup/openshift/“. How we can do WebhookAdmission in open shift cluster 4.1 on aws. file (etc/origin/master/master-config.yaml) should be present on master instance but its not.
OpenShift 4.1 is based on Kubernetes 1.13, and MutatingAdmissionWebhook is enabled by default in Kubernetes 1.13. See here UPDATING THE MASTER CONFIGURATION , Master configuration updates are not necessary if you are running OpenShift Container Platform 4.1. as mentioned.