Bug#981101: cgroup is not mounted

[shan.bharani at gmail.com]

Hi Michael,

Shouldn't "/sys/fs/cgroup/unified" be mounted by systemd to be used lxc
to use cgroupv2?

Should we need to do "mount -t tmpfs cgroup /sys/fs/cgroup" for
cgroupv2 as well? Will it be done systemd ?

In cgroupv1, it is usually seen "/sys/fs/cgroup" mounted on tmpfs. In
case of cgroupv2 unified, nothing like that is seen.


df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.4G     0  3.4G   0% /dev
tmpfs           692M  1.7M  691M   1% /run
/dev/sda8       125G   57G   62G  48% /
tmpfs           3.4G     0  3.4G   0% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
/dev/sda1        96M   62M   35M  65% /boot/efi
tmpfs           692M  212K  692M   1% /run/user/1000



Please note that lxc and lxcfs is malfunctioning for fresh installs
(Linux coffee 5.10.0-1-amd64 #1 SMP Debian 5.10.4-1 (2020-12-31) x86_64
GNU/Linux) as well. Not sure which package is having problem. But
its(lxc) not working.

========================================================

I will try the below suggestion and will update if its working.


Thanks and Regards,
Bharani

On Tue, 2021-01-26 at 13:06 +0100, Michael Biebl wrote:
> Am 26.01.21 um 12:57 schrieb shan.bharani at gmail.com:
> 
> > mount | grep -i cgroup
> > cgroup2 on /sys/fs/cgroup type cgroup2
> > (rw,nosuid,nodev,noexec,relatime)
> > 
> 
> This is intentional. See systemd's NEWS file:
> 
> systemd (247.2-2) unstable; urgency=medium
> 
>    systemd now defaults to the "unified" cgroup hierarchy (i.e.
> cgroupv2).
>    This change reflects the fact that cgroupsv2 support has matured
>    substantially in both systemd and in the kernel.
>    All major container tools nowadays should support cgroupv2.
>    If you run into problems with cgroupv2, you can switch back to the
> previous,
>    hybrid setup by adding "systemd.unified_cgroup_hierarchy=false" to
> the
>    kernel command line.
>    You can read more about the benefits of cgroupv2 at
>    https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html
> 
>   -- Michael Biebl <biebl at debian.org>  Mon, 21 Dec 2020 18:40:10
> +0100
> 
> 
>