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You can get stuff like this with Network Policies...

Kubernetes Network Policy Recipes

This repository contains various use cases of Kubernetes Network Policies 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 Google Kubernetes Engine 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 Securing Kubernetes Cluster Networking article first.

Before you begin

I really recommend watching my KubeCon talk on Network Policies if you want to get a good understanding of this feature. It will help you understand this repo better.

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