Red Hat OpenShift Container Platform

Adding network policies to the new project template

You can add NetworkPolicy objects to the default project template so that new projects automatically include predefined network isolation rules. Applying network policies through templates helps enforce consistent network security controls across projects.

Prerequisites

Your cluster uses a default container network interface (CNI) network plugin that supports NetworkPolicy objects, such as the OVN-Kubernetes.
You installed the OpenShift CLI (oc).
You must log in to the cluster with a user with cluster-admin privileges.
You must have created a custom default project template for new projects.

Procedure

Edit the default template for a new project by running the following command:
```
$ oc edit template <project_template> -n openshift-config
```
Replace <project_template> with the name of the default template that you configured for your cluster. The default template name is project-request.

In the template, add each NetworkPolicy object as an element to the objects parameter. The objects parameter accepts a collection of one or more objects.

In the following example, the objects parameter collection includes several NetworkPolicy objects.

objects:
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-same-namespace
  spec:
    podSelector: {}
    ingress:
    - from:
      - podSelector: {}
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-openshift-ingress
  spec:
    ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            policy-group.network.openshift.io/ingress:
    podSelector: {}
    policyTypes:
    - Ingress
- apiVersion: networking.k8s.io/v1
  kind: NetworkPolicy
  metadata:
    name: allow-from-kube-apiserver-operator
  spec:
    ingress:
    - from:
      - namespaceSelector:
          matchLabels:
            kubernetes.io/metadata.name: openshift-kube-apiserver-operator
        podSelector:
          matchLabels:
            app: kube-apiserver-operator
    policyTypes:
    - Ingress
...

Optional: Create a new project and confirm the successful creation of your network policy objects.
1. Create a new project:
  $ oc new-project <project>
  Replace <project> with the name of the project you want to create.
2. Confirm that the network policy objects in the new project template exist in the new project:
  $ oc get networkpolicy
  Expected output:
  NAME POD-SELECTOR AGE allow-from-openshift-ingress <none> 7s allow-from-same-namespace <none> 7s