k-rail is a deprecated workload policy enforcement tool designed for Kubernetes environments. The tool was created to help secure multi-tenant clusters by implementing various security policies with minimal operational disruption. The tool supports multiple security policies including: - Prevention of ShareProcessNamespace usage - Blocking exec commands in containers - Restricting bind mounts and Docker socket mounts - Enforcing EmptyDir size limits - Mutating default seccomp profiles - Requiring immutable image references - Preventing host network and host PID access - Blocking new capabilities and privileged containers - Restricting Helm Tiller usage Additional policy configurations include trusted image repository enforcement, ingress exemption requirements, unique ingress host validation, service type LoadBalancer annotation checks, Istio VirtualService gateway validation, and persistent volume restrictions. The project has been officially deprecated and will only receive updates for critical security vulnerabilities. The maintainers recommend migrating to actively developed alternatives like OPA Gatekeeper that provide similar functionality for Kubernetes policy enforcement.