Greetings,
I am very aware this is not the place for user questions. This is also where
the likelihood of an answer /at all/ are the highest. So, please bear with me;
at the bottom[fn:1] are all the other places where I tried to find hints
before posting here.
The issue is that I upgraded my computer to Fedora 32 from version 30, and
broke some scripts in the process; they were relying on cgroup v1. The system-
wide change proposal submitted for Fedora 31[fn:2] and the associated release
notes[fn:3], along with many other locations on the inter-webs, all seemed to
indicate that adaptation to v2 would pass through systemd. The broken scripts
do not invoke (not directly, strictly speaking) systemd at all. This citation
is from the aforementioned release notes:
#+BEGIN_QUOTE
The tools or scripts should not require any changes, if they utilized the
`systemd` interfaces.
#+END_QUOTE
Here is an example of how I wrote the scripts:
#+BEGIN_EG1 Bash
# Configuring a group
TGT='foo'
GRP='woe'
let M=(500 * 1024 * 1024)
let C=250000
cgcreate \
-a "${TGT}:${TGT}" \
-t "${TGT}:${TGT}" \
-g memory:"${GRP}" \
-g cpu:"${GRP}"
printf "%d" "$M" > \
/sys/fs/cgroup/memory/"$GRP"/memory.limit_in_bytes
printf "%d" "$C" > \
/sys/fs/cgroup/cpu/"$GRP"/cpu.cfs_quota_us
# Using the new group
cgexec --sticky -g "memory,cpu:${GRP}" <SOME-COMMAND>
#+END_EG1
That does not cut it anymore. The furthest I went to trying something else is
editing this file:
#+BEGIN_EG2 /etc/cgconfig.conf
group woe {
perm {
task {
uid = foo;
gid = foo;
}
}
memory {
memory.high = 524288000;
}
cpu {
cpu.max = 0500000 1000000;
}
}
#+END_EG2
I believed that after a system reboot, systemd would create the cgroup `foo`.
But nothing I could see/test happened. So, here is where your help would be
greatly appreciated: how to use the `cgcreate` command and the like under
libcgroup v2? Alternatively, if the way is by configuration files, where to
create them and how to enforce what they stipulate? I do not mind *reading*
literature on the subject, provided the assumed audience is a lay-user, not a
kernel/container… developer.
Thanks in advance.
...
[fn:1] So far, to no avail,
1. I scanned various pages at [[licgroup’s upstream]][https://sourceforge.net/
projects/libcg/];
2. re-read some manuals;
3. posted at users@l.f.o;
4. went to places on the web…
[fn:2] Unified hierarchy proposal[[https://fedoraproject.org/wiki/Changes/
CGroupsV2]]
[fn:3] Release notes [[https://pagure.io/fork/quiet/fedora-docs/release-notes/
blob/06f98a01f9bbb437b0e51b2cba69ed2735483fa9/f/modules/release-notes/pages/
sysadmin/Kernel.adoc]]
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