问为什么不能重启FTP服务？

[root@VM-20-14-centos lighthouse]# sudo systemctl restart vsftpd

Job for vsftpd.service failed because the control process exited with error code. See "systemctl status vsftpd.service" and "journalctl -xe" for details.

[root@VM-20-14-centos lighthouse]# sudo netstat -antup | grep ftp

[root@VM-20-14-centos lighthouse]# sudo systemctl start vsftpd

Job for vsftpd.service failed because the control process exited with error code. See "systemctl status vsftpd.service" and "journalctl -xe" for details.