Hardening Your Kubernetes Cluster - Guidelines (Pt. 2)

The guide provides detailed recommendations for enhancing the security of Kubernetes (K8s) clusters, focusing on pod security, network security, authentication, authorization, and auditing. It emphasizes the importance of not running containers as root, using immutable file systems, conducting image scanning, and implementing robust pod security policies. Network security is strengthened by denying access to control plane nodes, employing namespace separation, and enforcing network policies to control traffic flow. For authentication and authorization, the guide suggests employing Role-Based Access Control (RBAC) with the principle of least privilege, securely managing secrets, and avoiding the use of service account tokens for authentication, particularly in managed services like AWS EKS. It also highlights the need for regular auditing of access to the cluster and suggests using IAM roles for streamlined access management. Additionally, it underscores the significance of enabling logging and auditing to maintain a chronological set of security-relevant records, thus ensuring a secure and robust Kubernetes environment.