Public bug reported:
Distributor ID: Ubuntu
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
If one sets in /etc/default/grub (as e.g. desired by facebook oomd):
GRUB_CMDLINE_LINUX="systemd.unified_cgroup_hierarchy=1 swapaccount=1 ..."
lxc is not able to start any containers anymore.
# lxc-start -F n04-01
lxc-start: n04-01: conf.c: lxc_setup_boot_id: 3249 Permission denied - Failed
to mount /dev/.lxc-boot-id to /proc/sys/kernel/random/boot_id
Failed to mount
cgroup at /sys/fs/cgroup/systemd: Operation not permitted
[!!!!!!] Failed to mount API filesystems.
Exiting PID 1...
config:
-------
# Common configuration
lxc.include = /usr/share/lxc/config/ubuntu.common.conf
# Container specific configuration
lxc.apparmor.profile = lxc-default-cgns-with-mounting
lxc.start.auto = 1
lxc.rootfs.path = dir:/zones/n04-01/rootfs
lxc.rootfs.options = noatime
lxc.mount.fstab = /zones/n04-01/fstab
lxc.uts.name = n04-01
lxc.arch = amd64
# Network configuration
lxc.net.0.type = macvlan
lxc.net.0.macvlan.mode = bridge
lxc.net.0.flags = up
lxc.net.0.link = vlan2
lxc.net.0.hwaddr = 00:80:41:22:0d:10
lxc.net.0.name = n04-01_0
#lxc.include = /zones/n04-01/nvconfig
lxc.start.order = 16
#lxc.net.0.ipv4 = 10.2.1.65/16
#lxc.net.0.ipv4.gateway = 10.2.0.1
** Affects: lxc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1917187
Title:
lxc cgroup2: containers unbootable
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