====== cgroups ======
short for control groups
a group of processes
limits, accounts for, and isolates resource usage of a collection of processes

This allows a program to employ multiple processes, all started, stopped, restarted, and managed as a group.

libcgroup
cgcreate
cgexec
cgclassify


Used by, among others:
  * CoreOS
  * Docker 
  * Hadoop 
  * Jelastic 
  * Kubernetes 
  * lmctfy (Let Me Contain That For You) 
  * LXC (LinuX Containers)
  * systemd
  * Mesos and Mesosphere 
  * HTCondor

cgroupsV2 has been released, adopted by Fedora in late 2019