Summary

In this chapter, we discussed the importance of security boundaries. Understanding the security domains and security boundaries within the Kubernetes ecosystem helps administrators understand the blast radius of an attack and have mitigation strategies in place to limit the damage caused in the event of an attack. Knowing Kubernetes entities is the starting point of fortifying security boundaries. Knowing the security boundaries built into the system layer with Linux namespaces and capabilities is the next step. Last but not least, understanding the power of network policies is also critical to build security segmentation into microservices.

After this chapter, you should grasp the concept of the security domain and security boundaries. You should also know the security domains, common entities in Kubernetes, as well as the security boundaries built within or around Kubernetes entities. You should know the importance of using built-in security features such as PodSecurityPolicy...