Hello Paul, as I am not experienced with cgroups, I would appreciate some help if you have got time to offer it.
Here is the code authored by Vixie to launch a cron job, as a grandchild
of cron's main process:
-------------------------8<-------------------------------
execle(shell, shell, "-c", e->cmd, (char *)0, e->envp);
-------------------------8<-------------------------------
I presume that one way to implement your wished feature might be to
modify beforehand the string e->cmd, in order to insert something as
"systemd-run --scope" at the begin...
What do you think about it ?
Thank you in advance for any hint.
Best regards, Georges.
Paul Wise a écrit :
> Package: cron
> Severity: wishlist
>
> It would be nice to have cron add the jobs it creates to systemd scope
> cgroups. The groups could be named according to the source of the job
> and the content of the cron job with unsafe characters replaced.
>
> crontab-root-17-*-*-*-*-cd-run-parts-report-etc-cron-hourly.scope
> user-root-0-0-*-*-*-mysqlbackup.scope
> user-pabs-0-7-*-*-*-sm-go-to-work.scope
>
> This would make it easier to see at a glance which processes belong to
> which cron job, right now the only way to do this is to set environment
> variables distinguishing the cron jobs and then grep the environment
> variables of process in the cron.service group.
>
> $ < /sys/fs/cgroup/systemd/system.slice/cron.service/cgroup.procs xargs
> -d'\n' -n1 -I^ grep -lz PABS_CRON_JOB= /proc/^/environ 2> /dev/null | grep -o
> '[0-9]\+'
> 20586
> 20587
> 20589
> 20594
> 20600
> $ systemctl status cron.service
> ● cron.service - Regular background program processing daemon
> Loaded: loaded (/lib/systemd/system/cron.service; enabled; vendor
> preset: enabled)
> Active: active (running) since Fri 2020-04-17 10:40:25 AWST; 4h 53min ago
> Docs: man:cron(8)
> Main PID: 907 (cron)
> Tasks: 11 (limit: 14310)
> Memory: 84.1M
> CGroup: /system.slice/cron.service
> ├─ 907 /usr/sbin/cron -f
> ├─20586 dbus-launch --autolaunch
> 6b1b8c9f8021eeb6f685a77d48917a8a --binary-syntax --close-stderr
> ├─20587 /usr/bin/dbus-daemon --syslog-only --fork --print-pid 5
> --print-address 7 --session
> ├─20589 /usr/libexec/at-spi-bus-launcher
> ├─20594 /usr/bin/dbus-daemon
> --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork
> --print-address 3
> └─20600 /usr/libexec/at-spi2-registryd --use-gnome-session
>
> --
> bye,
> pabs
>
> https://wiki.debian.org/PaulWise
--
Georges KHAZNADAR et Jocelyne FOURNIER
22 rue des mouettes, 59240 Dunkerque France.
Téléphone +33 (0)3 28 29 17 70
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