[pve-devel] how to enable cgroupv2 for lxc ?

[pve-devel] how to enable cgroupv2 for lxc ?

[Alexandre Derumier]

Hi,
I'm stil working on rdd && new pressure stats.

pressure stats in cgroup are only available in cgroupv2.
so it's working for qemu, but I  don't have counter for lxc as it's
still using cgroupv1.

I see that wolfgang have already add support for cgroupv2 in LXC::Cgroups,
I would like to enable it to test if I can get correct pressure info.

does somebody known how to enable it ? some sysctl or grub option maybe ?

Re: [pve-devel] how to enable cgroupv2 for lxc ?

[Stoiko Ivanov]

Hi,



On Thu, 29 Oct 2020 13:44:05 +0100
Alexandre Derumier <aderumier@odiso.com> wrote:

> Hi,
> I'm stil working on rdd && new pressure stats.
> 
> pressure stats in cgroup are only available in cgroupv2.
> so it's working for qemu, but I  don't have counter for lxc as it's
> still using cgroupv1.
> 
> I see that wolfgang have already add support for cgroupv2 in LXC::Cgroups,
> I would like to enable it to test if I can get correct pressure info.
> 
> does somebody known how to enable it ? some sysctl or grub option maybe ?

adding systemd.unified_cgroup_hierarchy=1 to the kernel commandline
(/etc/default/grub or /etc/kernel/cmdline (ZFS on UEFI) ) should work:
https://wiki.debian.org/LXC/CGroupV2



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