vsftpd[9183]: warning: can't get client address: Socket operation on non-socket

今天在linux redhat7.2下執行service vsftpd start一直不能開啓vsftpd服務，本來懷疑SELINUX的問題（其他ftp下載問題可以看下我的另外一篇博客Linux下ftp常見問題總結），具體錯誤如下

[root@localhost trainborne]# service vsftpd start
Redirecting to /bin/systemctl start  vsftpd.service
Job for vsftpd.service failed because the control process exited with error code. See "systemctl status vsftpd.service" and "journalctl -xe" for details.

接着我查看下狀態出現如下這個錯誤

[root@localhost trainborne]# service vsftpd status
Redirecting to /bin/systemctl status  vsftpd.service
● vsftpd.service - Vsftpd ftp daemon
   Loaded: loaded (/usr/lib/systemd/system/vsftpd.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

Nov 27 15:33:42 localhost.localdomain vsftpd[9183]: warning: can't get client address: Socket operation on non-socket
Nov 27 15:33:42 localhost.localdomain systemd[1]: vsftpd.service: control process exited, code=exited status=2
Nov 27 15:33:42 localhost.localdomain systemd[1]: Failed to start Vsftpd ftp daemon.
Nov 27 15:33:42 localhost.localdomain systemd[1]: Unit vsftpd.service entered failed state.
Nov 27 15:33:42 localhost.localdomain systemd[1]: vsftpd.service failed.
Nov 27 15:35:01 localhost.localdomain systemd[1]: Starting Vsftpd ftp daemon...
Nov 27 15:35:01 localhost.localdomain systemd[1]: Started Vsftpd ftp daemon.
Nov 27 15:35:37 localhost.localdomain systemd[1]: Stopping Vsftpd ftp daemon...
Nov 27 15:35:37 localhost.localdomain systemd[1]: Stopped Vsftpd ftp daemon.
Nov 27 15:35:38 localhost.localdomain systemd[1]: Stopped Vsftpd ftp daemon.

出現該問題主要是因爲vsftpd.conf配置文件(具體目錄/etc/vsftpd/vsftpd.conf)出現了問題，
解決方法：1.修改vsftpd.conf裏面字段listen = NO=> listen=YES

                    2.將listen_ipv6=YES改爲listen_ipv6=NO或者直接#listen_ipv6=YES屏蔽掉

                    3.netstat -anp |grep 21（查看下21端口是否被佔用，一般ftp都是21端口，如果佔用，將listen_port改爲其他端口）