February 5, 2023
Kubernetes Pods can freely communicate with each other by default. This poses a security risk when your cluster’s used for multiple applications or teams. Errant behavior or malicious access in one Pod could direct traffic to the other Pods in your cluster. This article will teach you how to avoid this scenario by setting up…

Kubernetes Pods can freely communicate with each other by default. This poses a security risk when your cluster’s used for multiple applications or teams. Errant behavior or malicious access in one Pod could direct traffic to the other Pods in your cluster.

This article will teach you how to avoid this scenario by setting up network policies. These rules let you control Pod-to-Pod traffic flows at the IP address level (OSI layer 3 or 4). You can precisely define the ingress and egress sources permitted for each Pod.

Creating a Network Policy

Network policies are created by adding NetworkPolicy objects to your cluster. Each policy defines the Pods it applies to and one or more ingress and egress rules. Here’s a basic policy manifest:

apiVersion: networking.k8s.io/v1 kind: NetworkPolicy metadata: name: network-policy namespace: app spec: podSelector: matchLabels: component: database policyTypes: – Ingress – Egress ingress: – from: – podSelector: matchLabels: component: api egress: – to: – podSelector: matchLabels: component: api

This network policy applies to any Pod with a component: database label in the app namespace. It states that ingress (incoming) and egress (outgoing) traffic is only allowed from and to Pods…

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