What are Kubernetes Network Policies?

What are Kubernetes Network Policies?

Kubernetes Network Policies are rules that control the traffic between pods in a Kubernetes cluster. They define how groups of pods can communicate with each other and with other network endpoints.

How do I create a Network Policy in Kubernetes?

To create a Network Policy, you need to define it in a YAML file specifying the pod selector, ingress, and egress rules. Then, apply it using kubectl apply -f <filename>.yaml.

Can you give me an example of a Network Policy?

Sure! Here's a simple example:

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-nginx
spec:
  podSelector:
    matchLabels:
      app: nginx
  policyTypes:
  - Ingress
  ingress:
  - from:
    - podSelector:
        matchLabels:
          app: frontend