12.4. Enabling traffic flow through custom ports

Procedure

1. Clone the allow-ext-to-central Kubernetes network policy:

   $ oc -n stackrox get networkpolicy.networking.k8s.io/allow-ext-to-central -o yaml > <directory_path>/allow-ext-to-central-custom-port.yaml

2. Use it as a reference to create your network policy, and in that policy, specify the port number you want to expose. Make sure to change the name of your network policy in the metadata section of the YAML file, so that it does not interfere with the built-in allow-ext-to-central policy.