Network Policy best practices
Of course, there are some best practices to keep in mind when creating network policies in Kubernetes. Let’s take a look at a few of the most important ones.
- Scale Network Policies in Large Clusters: You can achieve scalability by using selective pod labeling and pod matching rules, avoiding over-restrictive policies and using efficient network policy implementations. Don’t forget to periodically review and optimize your network policies to ensure that they’re still necessary and effective.
- Monitor Network Policy Activity: Monitoring and logging network policy activities is essential to detect and investigate security incidents, troubleshoot network issues and identify opportunities for optimization.
- Log Network policies: You may inspect the logs and status information for your network policies using Kubernetes tools like kubectl logs and kubectl describe. For increased insight into network activity and policy visibility, you may also employ third-party monitoring and logging services.
- Ensure isolation: The first step in ensuring proper isolation is to identify which pods should be allowed to communicate with each other and which should be isolated from each other. Then define rules to enforce these policies. Since Kubernetes network policies allow you to control network traffic between pods, it’s important to define them well to ensure proper isolation.
- Use precise target selectors: Make sure that your Pod selectors, namespace selectors, and ipBlock ranges are as accurate as feasible to avoid future instances of them unintentionally picking new Pods. If you want to deploy other Pods to the namespace, for instance, and those Pods shouldn’t automatically communicate with the target of your Network Policy, then a namespace selector is improper.
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.