How do NetworkPolicies enforce zero-trust pod network isolation in Kubernetes?

Explanation & Concept

By default, all pods in a Kubernetes cluster can communicate with all other pods across all namespaces. **NetworkPolicies** act as virtual firewalls to restrict ingress and egress traffic between pods based on labels.

Code Example

yaml

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: db-policy
spec:
  podSelector:
    matchLabels:
      role: db
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: backend # Only backend pods can talk to the database!

How It Works & Key Takeaways

Network policies prevent compromised frontend pods from scanning or connecting directly to internal database pods.

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yaml

How do NetworkPolicies enforce zero-trust pod network isolation in Kubernetes?

Explanation & Concept

Code Example

yaml

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: db-policy
spec:
  podSelector:
    matchLabels:
      role: db
  ingress:
  - from:
    - podSelector:
        matchLabels:
          role: backend # Only backend pods can talk to the database!

How It Works & Key Takeaways

Network policies prevent compromised frontend pods from scanning or connecting directly to internal database pods.

Mock Test · 1 Questions · Optional

Ready for Helm Charts Basics?

Take a quick test to evaluate yourself, or move straight to the next module.

Advanced1 questions

Skip