Public bug reported:
I used LXD a lot.
I had 4 Ubuntu 20.04 systems I wanted to upgrade to 22.04.
Upgrading the 1st two systems (both laptops) was successful BUT .. after
the upgrade I could LXD could create a new Ubuntu 22.04 or Ubuntu 20.04
container but the containers could not "start".
I spent a lot of time trying to figure out why and then gave up and just
decided wipe those 2 laptops and do a "clean" install of 22.04.
The installation of 22.04 on both was successful AND.. LXD worked (ie I
could create & run Ubuntu 20.04 and 22.04 containers).
The 2nd two systems were larger Desktop 20.04 systems (12 core AMD, 3-4
TB SSD, 64GB ram).
I "upgraded" 1 of those 2 Desktop systems successfully to 22.04.
However, after the upgrade, again LXD could create but NOT start Ubuntu
22.04 or 20.04 containers??
Troubleshooting further I found there was a problem that appeared like
an issue with how systemd is setting up cgroups in the upgrade from
Focal to Jammy.
I found a "workaround" was to disable cgroup2 which I did by:
> add the following string to the GRUB_CMDLINE_LINUX line in /etc/default/grub
> and then run sudo update-grub.
"systemd.unified_cgroup_hierarchy=0"
Once I'd done the above and rebooted... LXD worked correctly again.
All this begs the question...
Why LXD/cgroup2 works correctly with a clean install of Ubuntu 22.04
but...
But "upgrading" a 20.04 to 22.04 causes LXD/cgroup2 to fail?
I just wanted to report this since I had multiple instances of this
occurring.
Brian
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: cgroup2
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https://bugs.launchpad.net/bugs/1971571
Title:
ubuntu 22.04 cgroup2 works for clean install but upgrade to 22.04
causes cgroup2 problems
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