Episode 116A - Control Groups in Linux

Welcome to Episode 116 Main Topic

Cgroups with Unclemarc!

Paul Menage and Rohit Seth

Solaris implemented zones in 2004, which featured
resource groups, providing cgroup-like functionality



Kernel version  2.6.24



Re-design for v2 begin in 2013



Cpu

Memory

Disk (I/O)

Cpuset



v1 -
https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt

V2 -
https://www.kernel.org/doc/Documentation/cgroup-v2.txt



What problem are we trying to solve?

Started at Google in 2006, originally named “process
containers”

Renamed to “control groups” and Introduced into kernel in
2007

First appeared in RHEL 6 but none of the tooling was
enabled by default

Critical component of systemd, so they’ve been active on
RHEL since RHEL 7

RHEL 8 is the first Red Hat OS to support cgroups
v2 

Most useful controllers (supported via systemd)

My blogs - https://www.redhat.com/en/authors/marc-richter

RHEL 8 docs -
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/setting-limits-for-applications_managing-monitoring-and-updating-the-kernel

Kernel docs

Comics!  https://wizardzines.com/comics/cgroups/




https://blog.godshell.com/its-docker-its-a-container-its-a-process/

Covers namespaces and cgroups (moreso namespaces)



 

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Intro and Outro music credit: Tri Tachyon, Digital MK 2
http://freemusicarchive.org/music/Tri-Tachyon/