Episode 116A - Control Groups in Linux

Iron Sysadmin Podcast

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 2http://freemusicarchive.org/music/Tri-Tachyon/