Failed to watch directory "/sys/fs/cgroup/memory/system.slice": inotify_add_watch /sys/fs/cgroup/memory/system.slice/run-docker-netns-c6d57b04b0f8.mount: no space left on device

fixed:

cat /proc/sys/fs/inotify/max_user_watches 
# default is 8192
# /etc/sysctl.d/k8s.conf
fs.inotify.max_user_watches=1048576
sysctl -p /etc/sysctl.d/k8s.conf