启动vsftpd进程时报错Job for vsftpd.service failed

问题描述：启动vsftpd进程时报错Job for vsftpd.service failed，如下所示：
系统：rhel 7.3
1、异常重现
[root@leo-827mgr-master local]# 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.
[root@leo-827mgr-master local]# 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 Sun 2023-10-22 17:48:06 CST; 17s ago
  Process: 61236 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf (code=exited, status=2)

Oct 22 17:48:06 leo-827mgr-master systemd[1]: Starting Vsftpd ftp daemon...
Oct 22 17:48:06 leo-827mgr-master systemd[1]: vsftpd.service: control process exited, code=exited status=2
Oct 22 17:48:06 leo-827mgr-master systemd[1]: Failed to start Vsftpd ftp daemon.
Oct 22 17:48:06 leo-827mgr-master systemd[1]: Unit vsftpd.service entered failed state.
Oct 22 17:48:06 leo-827mgr-master systemd[1]: vsftpd.service failed.

2、解决过程
2.1、端口确认
--查看21端口是否被占用.
[root@leo-827mgr-master vsftpd]# lsof -i:21
COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
vsftpd  61387 root    3u  IPv6 296056      0t0  TCP *:ftp (LISTEN)
[root@leo-827mgr-master vsftpd]# netstat -antup | grep 21
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      1211/sshd           
tcp6       0      0 :::21                   :::*                    LISTEN      61387/vsftpd        
tcp6       0      0 :::22                   :::*                    LISTEN      1211/sshd           

说明：先kill占用端口的进程号.

2.2、修改配置文件
[root@leo-827mgr-master vsftpd]# vi /etc/vsftpd/vsftpd.conf 
.....          
chroot_local_user=YES
chroot_list_enable=NO
# (default follows)
chroot_list_file=/etc/vsftpd/chroot_list
......

2.3、重启vsftpd进程
[root@leo-827mgr-master vsftpd]# systemctl start vsftpd.service
[root@leo-827mgr-master vsftpd]# systemctl status vsftpd.service
● vsftpd.service - Vsftpd ftp daemon
   Loaded: loaded (/usr/lib/systemd/system/vsftpd.service; disabled; vendor preset: disabled)
   Active: active (running) since Sun 2023-10-22 17:56:41 CST; 5s ago
  Process: 61386 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf (code=exited, status=0/SUCCESS)
 Main PID: 61387 (vsftpd)
   CGroup: /system.slice/vsftpd.service
           └─61387 /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf

Oct 22 17:56:41 leo-827mgr-master systemd[1]: Starting Vsftpd ftp daemon...
Oct 22 17:56:41 leo-827mgr-master systemd[1]: Started Vsftpd ftp daemon.

说明：将(default follows)注释掉后成功开启vsftpd进程.

参考网址：https://blog.csdn.net/weixin_43891901/article/details/124930083