Using network policies effectively
The Kubernetes network policy is about managing network traffic to selected pods and namespaces. In a world of hundreds of microservices deployed and orchestrated, as is often the case with Kubernetes, managing networking and connectivity between pods is essential. It's important to understand that it is not primarily a security mechanism. If an attacker can reach the internal network, they will probably be able to create their own pods that comply with the network policy in place and communicate freely with other pods. In the previous section, we looked at different Kubernetes networking solutions and focused on the container networking interface. In this section, the focus is on network policy, although there are strong connections between the networking solution and how network policy is implemented on top of it.
Understanding the Kubernetes network policy design
A network policy is a specification of how selections of pods can communicate...