Linuxkit is a toolkit for building secure, portable and lean operating systems for containers. But currently Linuxkit is built based on mainline linux. So it just provide such the soft real time implementation. In many use cases like IoT, even some time-sensitive tasks in the cloud, we really need to meet hard real time requirement. Preempt-RT Linux patch can convert mainline Linux to be preempt-able. Here we will review together how we can integrate Preempt-RT Linux patches to make sure Linuxkit can build out Real Time Linux for container. This can help us deploy different Linux/Docker onto the resource constrained IoT Gateway. In addition, I hope we can discuss if-how we can tune Real Time Configuration in the case of Docker.