Cgroup

The control group of a process can be retrieved from the /proc directory. We only need to know the PID of the process, which can be found using ps or pidof. Usage If we know that our PID is 1234, then showing the cgroup is as easy as using cat to see the contents of the ‘cgroup’ file. cat /proc/1234/cgroup To see the cgroup for the nginx process (or one of them), we could something like this.

The ps command can show the control group of a process using the -o option, followed by the right column names. Usage To show processes and the control group, we can filter the output columns. # ps -e -o pid,cgroup:64,args PID CGROUP COMMAND 1 0::/init.scope /lib/systemd/systemd --system --deserialize 58 2 - [kthreadd] 3 - [rcu_gp] <snip> 576 - [xprtiod] 634 0::/system.slice/dbus.service @dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only 640 0::/system.slice/networkd-dispatcher.service /usr/bin/python3 /usr/bin/networkd-dispatcher --run-startup-triggers 645 - [nfsiod] 653 0::/system.