[lxc-users] Disappearing cgroups

Ben Green ben at bristolwireless.net
Tue Oct 8 14:41:42 UTC 2019

Quoting "Serge E. Hallyn" <serge at hallyn.com>:

> BTW, much as I'd like to get to the bottom of this, let's get you up
> and running first.  I'd suggest you create a systemd service which starts
> at boot which creates and configures cgroups called  
> /sys/fs/cgroup/*/forcontainers
> and chowns them to your userid.  Then for convenience a  
> enter-container-cgroups
> script which just does echo $$ > /sys/fs/cgroup/*/forcontainers/tasks.  Then
> just run enter-container-cgroups before you lxc-start -n containerX

OK so if I understand correctly, I've ended up with 2 scripts:



which looks like this:

  for i in $(find /sys/fs/cgroup/ -maxdepth 1 -mindepth 1 -type d); do  
mkdir -p $i/forcontainers ; echo $i/forcontainers ; chown -R  
lxcadmin:lxcadmin $i/forcontainers ; done

I've make the chown recursive, so everything under there is owned by  
lxcadmin. This is run on boot.



which looks like this:

  for i in $(find /sys/fs/cgroup/ -maxdepth 1 -mindepth 1 -type d |  
grep -v unified); do echo $PPID > $i/forcontainers/tasks ; done

I've used $PPID rather than $$ here as it's parent script (i.e. the  
bash shell I'm currently running in) which I've assumed you want  
moving in to the cgroups. I've also excluded 'unified' as it doesn't  
contain a 'tasks' file. I run this before I start a container as user  

Let me know if I've got this right. Now on starting the guests I have:


Which is good in itself as it feels like I have some control now. I'll  
have to rewrite my cgroups checking script now to take note of these  
new locations.


More information about the lxc-users mailing list