转载于：http://blog.csdn.net/it_dream_er/article/details/50783111
刚刚在搭建ftp服务器时，在配置好一切的参数之后，在我重启时，出现了无法启动的错误，将配置文件改了好多次都更改不好，终于在经过一阵查资料后，终于将问题定位了出来，下面先摆出错误信息：
- [root@www /home/zhoupan]# 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.
[root@www /home/zhoupan]# /etc/init.d/vsftpd start
Starting vsftpd (via systemctl): Job for vsftpd.service failed because the control process exited with error code. See "systemctl status vsftpd.service" and "journalctl -xe" for details.
[FAILED]
[root@www /home/zhoupan]# systemctl status vsftpd.service
● vsftpd.service - Vsftpd ftp daemon
Loaded: loaded (/usr/lib/systemd/system/vsftpd.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since 三 2016-03-02 08:09:50 EST; 18s ago
Process: 17087 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf (code=exited, status=2)
Main PID: 16908 (code=killed, signal=TERM)
月 02 08:09:50 www.dreamchasinger.cn systemd[1]: Starting Vsftpd ftp daemon...
月 02 08:09:50 www.dreamchasinger.cn systemd[1]: vsftpd.service: control process exited, code=exited status=2
月 02 08:09:50 www.dreamchasinger.cn systemd[1]: Failed to start Vsftpd ftp daemon.
月 02 08:09:50 www.dreamchasinger.cn systemd[1]: Unit vsftpd.service entered failed state.
月 02 08:09:50 www.dreamchasinger.cn systemd[1]: vsftpd.service failed.
[root@www /home/zhoupan]# journalctl -xe
月 02 08:10:01 www.dreamchasinger.cn kernel: SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs
月 02 08:10:01 www.dreamchasinger.cn systemd[1]: Created slice user-0.slice.
-- Subject: Unit user-0.slice has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit user-0.slice has finished starting up.
--
-- The start-up result is done.
月 02 08:10:01 www.dreamchasinger.cn systemd[1]: Starting user-0.slice.
-- Subject: Unit user-0.slice has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit user-0.slice has begun starting up.
月 02 08:10:01 www.dreamchasinger.cn systemd[1]: Started Session 18 of user root.
-- Subject: Unit session-18.scope has finished start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit session-18.scope has finished starting up.
--
-- The start-up result is done.
月 02 08:10:01 www.dreamchasinger.cn systemd[1]: Starting Session 18 of user root.
-- Subject: Unit session-18.scope has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit session-18.scope has begun starting up.
月 02 08:10:01 www.dreamchasinger.cn CROND[17093]: (root) CMD (/usr/lib64/sa/sa1 1 1)
月 02 08:10:01 www.dreamchasinger.cn systemd[1]: Removed slice user-0.slice.
-- Subject: Unit user-0.slice has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit user-0.slice has finished shutting down.
月 02 08:10:01 www.dreamchasinger.cn systemd[1]: Stopping user-0.slice.
-- Subject: Unit user-0.slice has begun shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit user-0.slice has begun shutting down.
月 02 08:10:03 www.dreamchasinger.cn systemd[1]: Configuration file /usr/lib/systemd/system/ebtables.service is marked executable. Please remove executable permission bits. Proceeding anywa
月 02 08:10:03 www.dreamchasinger.cn systemd[1]: Configuration file /usr/lib/systemd/system/wpa_supplicant.service is marked executable. Please remove executable permission bits. Proceeding
月 02 08:10:07 www.dreamchasinger.cn systemd[1]: Configuration file /usr/lib/systemd/system/ebtables.service is marked executable. Please remove executable permission bits. Proceeding anywa
月 02 08:10:07 www.dreamchasinger.cn systemd[1]:
我的配置文件内容为：
- [root@www /home/zhoupan]# cat /etc/vsftpd/vsftpd.conf | grep '^[^#]'
anonymous_enable=YES
local_enable=YES
write_enable=YES
local_umask=022
xferlog_enable=YES
connect_from_port_20=YES
xferlog_file=/var/log/xferlog
xferlog_std_format=YES
ftpd_banner=Welcome to blah FTP service.
listen=YES
listen_port=21
listen_ipv6=YES
pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES
pasv_enable=YES
use_localtime=YES
出现错误的原因是：由于centos7中vsftp的配置文件默认将 listen_ipv6=YES 这一行没有注释掉，而我们目前的网络环境还不支持ipv6，从而导致出现错误无法启动，所以解决方法是将 listen_ipv6=YES更改为：listen_ipv6=NO，或将这一行注释掉
按上面的方法注释掉 listen_ipv6=YES后，成功启动vsftp
