How can I remove cgroup version 1 mount points such that I only cgroup version 2 in my /sys/fs/?
Answers:
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Method 1
One easy way to do it is like this,
mount -t cgroup | cut -f 3 -d ' ' | xargs sudo umount
This will select only the mounts that are part of cgroup version 1, taking just their mount points and then unmounting them.
Update: You may also want to clean up the remaining relics on tmpsfs mount at /sys/fs/cgroup (taken from the answer there),
sudo mount -o remount,rw /sys/fs/cgroup
# Delete the symlinks
sudo find /sys/fs/cgroup -maxdepth 1 -type l -exec rm {} ;
# Delete the empty directories
sudo find /sys/fs/cgroup/ -links 2 -type d -not -path '/sys/fs/cgroup/unified/*' -exec rmdir -v {} ;
sudo mount -o remount,ro /sys/fs/cgroup
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0