How do I use network policies in Kubernetes?

How do I use network policies in Kubernetes?

To use network policies in Kubernetes, you first need to define the policy in a YAML file. This policy specifies which pods can communicate with each other.

Can you give me an example of a network policy YAML?

Sure! Here's a simple example:

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

What does this policy do?

This policy allows pods with the label 'role: frontend' to communicate with pods labeled 'role: db'.

Are there any best practices for using network policies?

Yes, some best practices include starting with a default deny policy, using labels effectively, and testing policies in a staging environment.