How does Network Policy work?
Kubernetes network policies allow you to control the network traffic between pods in a cluster, providing an additional layer of security. It’s also possible to use Network Policies to block all network communications for a Pod or restrict traffic to a specific port range. Network Policies are additive, so you can have multiple policies targeting a particular Pod. They are implemented using a Container Network Interface (CNI) plugin that is installed in the cluster.
Using a YAML manifest file that contains the desired selectors, ingress, and egress rules, the network policies are defined as Kubernetes objects. To apply network policies, use the Kubernetes API. The Kubernetes Dashboard or command-line tools can be used to construct and edit them.
kubernetes Network Policlies
Everyone agrees that Kubernetes clusters are insecure by default. But the good news is that Kubernetes provides the tools to make that happen. In this article, we’re going to learn about one of the resources that K8s provides straight out of the box to help make your deployed apps more secure: Network policies.
A Kubernetes network policy specifies how pods can communicate with one another and other network endpoints in a Kubernetes cluster. Network policies provide fine-grained control over network traffic, allowing you to partition your network and secure your applications. They allow you to set incoming and outgoing traffic rules for pods and are implemented in the Kubernetes cluster using a CNI plugin like Calico or Weave Net.