[Bug 2073625] Re: systemd-nspawn uses cgroupv1

[Nick Rosbrook]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. I suspect a support site would be more appropriate, e.g.
https://askubuntu.com, or for more options please look at
https://discourse.ubuntu.com/t/community-support/709.

** Changed in: systemd (Ubuntu)
       Status: New => Invalid

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Title:
  systemd-nspawn uses cgroupv1

Status in systemd package in Ubuntu:
  Invalid

Bug description:
  Even though Ubuntu 22.04 is definitely using cgroup2:
  cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)

  systemd appears to be using cgroup:

  cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
  cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
  cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
  cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
  cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
  cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
  cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
  cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
  cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
  cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
  cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
  cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
  cgroup on /sys/fs/cgroup/misc type cgroup (rw,nosuid,nodev,noexec,relatime,misc)

  
  When starting a container using default configuration from `systemd-nspawn@` unit it automatically selects cgroupv1 for some reason:

   systemd-nspawn at debian-sid.service - Container debian-sid
       Loaded: loaded (/lib/systemd/system/systemd-nspawn at .service; disabled; vendor preset: enabled)
       Active: active (running) since Sat 2024-07-20 00:48:30 +07; 1s ago
         Docs: man:systemd-nspawn(1)
     Main PID: 5210 (systemd-nspawn)
       Status: "Container running."
        Tasks: 2 (limit: 16384)
       Memory: 2.7M
       CGroup: /machine.slice/systemd-nspawn at debian-sid.service
               ├─payload
               │ └─5214 /usr/lib/systemd/systemd
               └─supervisor
                 └─5210 systemd-nspawn --quiet --keep-unit --boot --link-journal=try-guest --network-veth -U --settings=override --ma>

  ก.ค. 20 00:48:30 ubuntu-dev systemd[1]: Starting Container debian-sid...
  ก.ค. 20 00:48:30 ubuntu-dev systemd[1]: Started Container debian-sid.
  ก.ค. 20 00:48:30 ubuntu-dev systemd-nspawn[5210]: Legacy cgroup v1 support selected. This is no longer supported ...

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: systemd-container 249.11-0ubuntu3.12
  ProcVersionSignature: Ubuntu 6.5.0-44.44~22.04.1-generic 6.5.13
  Uname: Linux 6.5.0-44-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Jul 20 00:43:45 2024
  InstallationDate: Installed on 2024-07-19 (0 days ago)
  InstallationMedia: Ubuntu 22.04.4 LTS "Jammy Jellyfish" - Release amd64 (20240220)
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)

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