Many clients have specific requirements for running their EKS Kubernetes clusters with Ubuntu: OS alignment across platforms, sysadmin knowledge or specific kernel features such Real Time Kernel or FIPS mode. If your workloads need to run on FIPS mode for compliance, you will not only need to create your containers on FIPS mode (in other words, with FIPS certified crypto libraries) but also, since containers share kernel with host/worker nodes, you need to have also the worker node's kernel running on FIPS mode.