Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:cgroups_debian [2025/03/24 15:06] – créée - modification externe 127.0.0.1
+++ tech:cgroups_debian [2026/06/16 15:29] (Version actuelle) – Jean-Baptiste
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon Debian Linux}}
+# Notes cgroup
+Voir :
+* http://blog.hintcafe.com/post/60223405371/resource-limiting-using-cgroups
+* http://www.linuxmao.org/CGroup
+* http://libcg.sourceforge.net/
+* http://askubuntu.com/questions/345055/how-to-use-cgroup-in-ubuntu-13-04
+* http://www.janoszen.com/2013/02/06/limiting-linux-processes-cgroups-explained
+* http://www.serverwatch.com/tutorials/article.php/3921001/Setting-Up-Linux-Cgroups.htm
+* https://unix.stackexchange.com/questions/22400/using-linux-cgroups-to-balance-cpu-performance
+* http://hydra.geht.net/tino/english/faq/debian/squeeze/cgroups/
+* http://upstart.ubuntu.com/wiki/Cgroup
+* http://hydra.geht.net/tino/english/faq/debian/squeeze/cgroups/
+* http://www.linuxmao.org/CGroup
+* https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Resource_Management_Guide/Starting_a_Process.html
+* [cpuset](https://codywu2010.wordpress.com/2015/09/27/cpuset-by-example/)
+* https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/managing_monitoring_and_updating_the_kernel/assembly_using-cgroupfs-to-manually-manage-cgroups_managing-monitoring-and-updating-the-kernel
+* https://docs.kernel.org/admin-guide/cgroup-v2.html
+* https://github.com/kubernetes-sigs/kind/issues/3650
+* https://linuxembedded.fr/2021/11/limiter-les-ressources-dune-ligne-de-commande-avec-systemd
+* https://lpc.events/event/16/contributions/1184/attachments/1019/1963/delegation-slides.pdf
+* https://www.freedesktop.org/software/systemd/man/latest/systemd.resource-control.html
+* https://systemd.io/CGROUP_DELEGATION/
+* https://blog.stephane-robert.info/docs/admin-serveurs/linux/cgroups/
+Tester si tous est ok
+~~~bash
+apt-get install lxc
+lxc-checkconfig
+~~~
+ou
+~~~bash
+#apt-get install docker.io
+#/usr/share/docker.io/contrib/check-config.sh
+~~~
+https://github.com/opencontainers/runc/blob/main/script/check-config.sh
+Dans Debian :mount cgroup automatically in mountkernfs.
+* https://wiki.debian.org/LXC
+* http://blog.blaisethirard.com/creer-des-serveurs-virtuels-debian-7-wheezy-avec-lxc-sur-un-dedie-ovh-kimsufi-2/
+* http://www.pointroot.org/index.php/2013/05/12/installation-du-systeme-de-virtualisation-lxc-linux-containers-sur-debian-wheezy/
+* https://fralef.me/getting-started-with-lxc-on-debian-wheezy.html
+* http://sylvain.fankhauser.name/setting-up-lxc-containers-in-30-minutes-debian-wheezy.html
+* http://l3net.wordpress.com/2013/08/10/debian-virtualization-lxc-application-containers/
+Normalement sous Debian, les cgroup sont automatiquement montés (dans le mountkernfs)
+~~~
+$ mount | grep cgroup
+none on /sys/fs/cgroup type tmpfs (rw,relatime,size=4k,mode=755)
+systemd on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,name=systemd)
+~~~
+Si ce n'est pas le cas, la technique d'ajouter dans /etc/fstab
+`/etc/fstab`
+~~~
+cgroup          /cgroup         cgroup  defaults        0       0
+~~~
+ou alors passer à systemd
+~~~bash
+apt-get install systemd systemd-sysv
+~~~
+Voir :
+* https://medium.com/@johannes_gehrs/getting-started-with-systemd-on-debian-jessie-e024758ca63d
+* https://wiki.debian.org/systemd
+* http://www.linuxcore.fr/2012/10/systemctl/
+Mais comme nous choisissons la méthode avec des services (méthode à la Redhat)
+Pour connaître les ????? FIXME prit en charge par le noyau
+~~~
+# lssubsys -a
+cpuset
+cpu
+cpuacct
+memory
+devices
+freezer
+net_cls
+blkio
+perf_event
+~~~
+Install du packet
+~~~bash
+apt-get update && apt-get install -y cgroup-tools
+~~~
+Puis
+~~~bash
+dpkg -L cgroup-tools
+~~~
+Donc
+~~~bash
+mkdir /etc/sysconfig/
+cp -p /usr/share/doc/cgroup-tools/examples/cgconfig.sysconfig /etc/sysconfig/cgconfig
+cp -p /usr/share/doc/cgroup-tools/examples/cgred.conf /etc/sysconfig/cgred
+cp -p /usr/share/doc/cgroup-tools/examples/cgred /etc/init.d/
+cp -p /usr/share/doc/cgroup-tools/examples/cgconfig /etc/init.d/
+cp -p /usr/share/doc/cgroup-tools/examples/cgconfig.conf /etc/
+cp -p /usr/share/doc/cgroup-tools/examples/cgrules.conf /etc/
+chmod a+x /etc/init.d/cgconfig /etc/init.d/cgred
+ln -s /etc/sysconfig/cgconfig /etc/default/
+ln -s /etc/sysconfig/cgred /etc/default/
+sed -i -e 's|/var/lock/subsys/|/var/lock/|g' /etc/init.d/cgred
+sed -i -e 's|/var/lock/subsys/|/var/lock/|g' /etc/init.d/cgconfig
+getent group cgred >/dev/null || groupadd -r cgred
+~~~
+Puis prendre le fichier /etc/rc.d/init.d/functions sur une CentOS.
+~~~bash
+mkdir -p /etc/rc.d/init.d/
+cp -p functions /etc/rc.d/init.d/
+~~~
+Commenter la ligne **[ -z "${CONSOLETYPE:-}" ] && CONSOLETYPE="$(/sbin/consoletype)"**
+~~~bash
+vi /etc/rc.d/init.d/functions
+~~~
+Puis
+~~~bash
+mkdir /cgroup
+cd /cgroup
+mkdir $(lssubsys -a)
+~~~
+Erreur sous Debian :
+~~~
+# /etc/init.d/cgconfig start
+Starting cgconfig service: Error: cannot mount memory to /cgroup/memory: No such file or directory
+/usr/sbin/cgconfigparser; error loading /etc/cgconfig.conf: Cgroup mounting failed
+[FAIL] Failed to parse /etc/cgconfig.conf ... failed!
+~~~
+Solution : rajouter "cgroup_enable=memory swapaccount=1" à votre Grub :
+`/etc/default/grub`
+~~~ini
+GRUB_CMDLINE_LINUX="vga=795 cgroup_enable=memory swapaccount=1"
+~~~
+~~~bash
+update-grub
+~~~
+Pour le debug si nécessaire :
+~~~bash
+export CGROUP_LOGLEVEL=debug
+~~~
+Autres
+~~~
+allocated 133693440 bytes of page_cgroup
+please try 'cgroup_disable=memory' option if you don't want memory cgroups
+~~~
+-----
+https://wiki.debian.org/LXC
+`/etc/fstab`
+~~~
+cgroup  /sys/fs/cgroup  cgroup  defaults  0   0
+~~~
+* http://stackoverflow.com/questions/21337522/trying-to-use-cgroups-in-debian-wheezy-and-no-daemons
+* http://blog.hbis.fr/2012/01/16/debian-webserver_and_cgroups/
+* http://linuxaria.com/article/introduction-to-cgroups-the-linux-conrol-group
+`/etc/default/grub`
+~~~ini
+GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"
+~~~
+* http://blog.docker.com/2013/10/gathering-lxc-docker-containers-metrics/
+-------------
+~~~bash
+sudo apt-get install cgroup-tools
+sudo cgcreate -a jean -g memory:plop
+echo 10000000 > /sys/fs/cgroup/memory/plop/memory.kmem.limit_in_bytes
+sudo cgexec -g memory:plop bash
+~~~
+-------------
+cgroupv1 ou v2 ?
+~~~bash
+podman info
+docker info
+mount | grep cgroup2
+systemctl --user status
+grep cgroup /proc/filesystems
+~~~
+Pour passer à la version 2
+~~~bash
+grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=1"
+~~~
+Autres
+~~~
+cat /sys/fs/cgroup/user.slice/user-1003.slice/cgroup.controllers
+cpuset cpu io memory pids
+~~~