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Unified CGroups

Problem introduced with change from systemd 241 to 247. Main change is to drop CGroup V1 support and switch by default to unified CGroup V2.

Lots of issues are reported, and lots of containerization software needs to be upgraded:

  • docker (CGroup V2 supported since v20.10)
  • kubernetes
  • lxcs

Workaround

systemd.unified_cgroup_hierarchy=1