更改hostname

暫時更改 sudo hostname NEWNAME

永久更改

/etc/hostname 只有一列: hostname 改掉即可

/etc/hosts 改掉名子那列，第2列 127.0.0.1 localhost 127.0.1.1 fufeng ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters

清除DNS sudo systemd-resolve --flush-caches