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  • Network policy recipes
  • Kubernetes Network Policy Recipes
  • NetworkPolicy Crash Course

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  1. Book
  2. Architect
  3. Kubernetes
  4. Network security

Network policy recipes

Last updated 1 year ago

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Network policy recipes

NetworkPolicies operate at layer 3 or 4 of OSI model (IP and port level). They are used to control the traffic in(ingress) and out(egress) of pods.

Here are some NetworkPolicies gotcha's

An empty selector will match everything. For example `spec.podSelector: {}` will apply the policy to all pods in the current namespace.
Selectors can only select Pods that are in the same namespace as the NetworkPolicies. Eg. `spec.podSelector` of an ingress rule can only select pods in the same namespace the NetworkPolicy is deployed to.
If no NetworkPolicies targets a pod, all traffic to and from the pod is allowed. In other words all traffic are allowed until a policy is applied.
There are no deny rules in NetworkPolicies. NetworkPolicies are deny by default allow explicitly. It's the same as saying "If you're not on the list you can't get in."
If a NetworkPolicies matches a pod but has a null rule, all traffic is blocked. Example of this is a "Deny all traffic policy".
spec:
  podSelector:
    matchLabels:
      ...
  ingress: []
  • Rules are chained together. NetworkPolicy are additive. If multiple NetworkPolicies are selecting a pod, their union is evaluated and applied to that pod.

  • 🔜 LIMIT egress traffic from an application to some pods

  • 🔜 ALLOW traffic only to Pods in a namespace

Disclaimer: This is not an official Google product.

This repository contains various use cases of Kubernetes and sample YAML files to leverage in your setup. If you ever wondered how to drop/restrict traffic to applications running on Kubernetes, read on.

Easiest way to try out Network Policies is to create a new cluster. Applying Network Policies on your existing cluster can disrupt the networking. At the time of writing, most cloud providers do not provide built-in network policy support.

If you are not familiar with Network Policies at all, I recommend reading my article first.

I really recommend if you want to get a good understanding of this feature. It will help you understand this repo better.

(a.k.a. LIMIT access to the current namespace)

Created by Ahmet Alp Balkan ().

Copyright 2017, Google Inc. Distributed under Apache License Version 2.0 ,see for details.

Kubernetes Network Policy Recipes
Network Policies
Google Kubernetes Engine
Securing Kubernetes Cluster Networking
NetworkPolicy Crash Course
Before you begin
watching my KubeCon talk on Network Policies
Create a cluster
Basics
DENY all traffic to an application
LIMIT traffic to an application
ALLOW all traffic to an application
Namespaces
DENY all non-whitelisted traffic in the current namespace
DENY all traffic from other namespaces
ALLOW traffic to an application from all namespaces
ALLOW all traffic from a namespace
ALLOW traffic from some pods in another namespace
Serving External Traffic
ALLOW traffic from external clients
Advanced
ALLOW traffic only to certain port numbers of an application
ALLOW traffic from apps using multiple selectors
Controlling Outbound (Egress) Traffic 🔥🆕🔥
DENY egress traffic from an application
DENY all non-whitelisted egress traffic in a namespace
LIMIT egress traffic to the cluster (DENY external egress traffic)
Author
@ahmetb
LICENSE
https://camo.githubusercontent.com/69c7b86ee4684b209e70193637d2b621d193913c755cd064ce7b6d00009f0fc1/68747470733a2f2f737461726368617274732e6865726f6b756170702e636f6d2f61686d6574622f6b756265726e657465732d6e6574776f726b706f6c6963792d7475746f7269616c2e737667
https://github.com/ahmetb/kubernetes-network-policy-recipes
You can get stuff like this with Network Policies...