[lxc-users] Cgroup saga continues - lxc-autostart woes.

[Serge E. Hallyn]

On Sun, Nov 22, 2020 at 01:41:14PM +0000, Ben Green wrote:
> On 21/11/2020 21:54, Serge E. Hallyn wrote:
> > I've never used lxc-autostart, but looking at the manpage, do you
> > have lxc.start.auto set in the containers you want to start?  What
> > do the configs look like?
> > 
> > Do the containers actually start but in the wrong cgroup?  Or do
> > they just not start?
> 
> They start, but the tasks part of some cgroup filesystems are unpopulated
> with PID numbers. This is particularly troublesome for the memory cgroup,
> for example: /sys/fs/cgroup/memory/forcontainers/lxc/example_server/tasks
> would contain nothing. This means the contains ends up with the memory
> limits assigned to the host.

Can you cat /proc/$pid/cgroup for one of the tasks in an autostarted container,
and show the /var/lib/lxc/container-name/config ?

> I can get the memory limits to work again, but copying the tasks pids from
> /sys/fs/cgroup/cpuset/forcontainers/lxc/example_server/tasks into
> /sys/fs/cgroup/memory/forcontainers/lxc/example_server/tasks. Then the
> server reports the required memory allowance again.
> 
> Other cgroups file systems are affected too, 'devices' and 'blkio' for
> example. We aren't doing anything with those though, so I'm concentrating
> 'memory' which I really need to make use of.
> 
> Cheers,
> 
> Ben
> 
> 
> 
> 
> 
> _______________________________________________
> lxc-users mailing list
> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users