Note Enabling cgroup v2 is optional. Enabling cgroup v2 is often needed for running Rootless Containers with limiting the consumption of the CPU, memory, I/O, and PIDs resources, e.g. docker run --memory 32m. Note that cgroup is not needed for just limiting resources with traditional ulimit and cpulimit, though they work in process-granularity rather than in container-granularity. See here for the further information. Checking whether cgroup v2 is already enabled If /sys/fs/cgroup/cgroup.
