[Control Groups](https://figtracer.com/Public/Resources/Linux/Control+Groups) Another great thing about systemd slices is that you can use them to control resources of Docker containers. This is especially useful if you need to tweak a cgroup controller for which there's no `docker run` flag (e.g., `memory.oom.group`), or when you want to place multiple Docker containers in the same cgroup, emulating a Kubernetes Pod: ``` docker run -d --name web --cgroup-parent=hog_pen.slice nginx docker run -d --name rdb --cgroup-parent=hog_pen.slice redis ```