A control group (cgroup) is a Linux kernel feature that limits, accounts for, and isolates the resource usage (CPU, memory, disk I/O, network, and so on) of a collection of processes. They provide the following features:

• resource limits
• prioritazation
• accounting/monitoring
• control

By default, the operating system terminates a process when it exceeds a resource limit defined by its cgroup.

References

• https://www.nginx.com/blog/what-are-namespaces-cgroups-how-do-they-work/

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