glob path question

Hi I use this command trying to find a file in /etc whose name contains "spf", root@cloud:~# cd /etc/ root@cloud:/etc# ls *spf* policyd-spf.conf But this file is not listed by 'ls' command. # ls /etc/policyd-spf.conf ls: cannot access '/etc/policyd-spf.conf': No such file or directory inst

clean docker library dir

Hello My VPS has docker installed, which consumes a lot of disk. /var/lib/docker# du -sh . 71.0G . I tried 'docker system prune' which seems not to delete the libraries it intalled. Do you know how to clean the objects in '/var/lib/docker'? Thanks.