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Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Kubernetes Network Policies

Introduction

Kubernetes by default allows all pod-to-pod communication — a flat network model that is convenient but insecure. Network policies provide pod-level firewalling, enabling micro-segmentation and zero-trust networking within the cluster.

Understanding Network Policies

A NetworkPolicy is a Kubernetes resource that specifies how groups of pods communicate with each other and with external endpoints. Policies are selector-based, namespace-scoped, and implemented by a Container Network Interface (CNI) plugin.

apiVersion: networking.k8s.io/v1

kind: NetworkPolicy

metadata:

name: api-policy

namespace: production

spec:

podSelector:

matchLabels:

app: api-server

policyTypes:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- Ingress

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- Egress

ingress:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- from:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- namespaceSelector:

matchLabels:

name: ingress-nginx

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- podSelector:

matchLabels:

app: api-gateway

ports:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\- protocol: TCP

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