Cgroups error: cgroup change of group failed

Question

I'm trying to test cgroup and, after I set it, I stumbled upon that error. That's what I did:

I ran the command:

sudo cgcreate -t test:grp -a sleax -g memory,cpu:grp
echo '10000000'> /sys/fs/cgroup/memory/grp/memory.limit_in_bytes

Then i went to try that with the user test:

test@sleax-PC:~$ cgexec stress -t 20 -c 99 -i 99
cgroup change of group failed

And that's the error I get. Why? I set -t test:grp so test is able to write the PIDs.

Possible duplicate of How to use cgroup in ubuntu 13.04 – user.dz Jun 07 '16 at 03:18 — user.dz, Jun 07 '16 at 03:18

score 6 · Answer 1 · answered Jun 25 '19 at 11:45

6

Specifying users and groups works fine when you create a subsystem.

sudo cgcreate -t $USER:$USER -a $USER:$USER  -g cpu:testgroupcpu

answered Jun 25 '19 at 11:45

Terrence

I had to run additionally this command to make the error go away: chmod 711 /sys/fs/cgroup/cpu,cpuacct – Roland Pihlakas Sep 30 '20 at 20:18
Update: More correct version would be probably chmod 751 /sys/fs/cgroup/cpu,cpuacct since the initial permission of that folder is 750. – Roland Pihlakas Dec 18 '20 at 05:21
2

Did not work on Ubuntu 22.04 unfortunately: https://askubuntu.com/questions/1406329/how-to-run-cgexec-without-sudo-as-current-user-on-ubuntu-22-04-with-cgroups-v2 – Ciro Santilli OurBigBook.com May 03 '22 at 11:37

1 Answers1