In the last blog post Dealing with a Lack of Entropy on your OpenShift Cluster we deployed the rng-tools software as a DaemonSet in a cluster. By using a DaemonSet, we took advantage of the tools that Kubernetes gives us for deploying an application to all targeted nodes in a cluster. This worked well for getting the rng daemon up and running on nodes that required it, but not all software will work this way. What if we need to install or update a package on the host Red Hat CoreOS (RHCOS) boot image? In the past this was always frowned upon/impossible. RHCOS is an immutable OS delivered to you by Red Hat that can not be modified.