当您在CentOS上遇到FTPServer故障时，可以按照以下步骤进行排查：
首先，检查vsftpd服务是否正在运行：
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systemctl status vsftpd.service
如果服务未启动，使用以下命令启动它：
systemctl start vsftpd.service
并设置开机自启：
systemctl enable vsftpd.service
查看vsftpd的日志文件以获取错误信息：
journalctl -xe
或查看/var/log/secure文件：
tail -f /var/log/secure
检查/etc/vsftpd/vsftpd.conf配置文件是否有语法错误或不正确的设置。例如：
如果防火墙正在运行，确保已允许FTP所需的端口（如21端口用于控制连接，10000-10070端口用于被动模式数据连接）：
firewall-cmd --permanent --zone=public --add-port=21/tcp
firewall-cmd --permanent --zone=public --add-port=10000-10070/tcp
firewall-cmd --reload
如果SELinux正在启用，确保其设置不会阻止vsftpd的正常运行。可以通过以下命令临时禁用SELinux：
setenforce 0
或永久禁用SELinux（需谨慎操作）：
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
使用ping命令测试与远程主机之间的连通性。如果无法ping通目标主机，则可能存在网络故障。
如果使用FTP客户端软件（如FileZilla）连接，确保使用正确的连接模式（主动或被动），并检查端口号设置。
如果遇到SELinux相关的错误，可以使用以下命令查看和设置SELinux策略：
getsebool -a | grep ftp
setsebool -P ftp_home_dir 1
确保服务配置文件中没有错误，例如：
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=NO
# Uncomment this to allow local users to log in.
local_enable=YES
# Uncomment this to enable any form of FTP write command.
write_enable=YES
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022
# Uncomment this to allow the anonymous FTP user to upload files.
# This only has an effect if the above global write enable is activated.
# Also, you will obviously need to create a directory writable by the FTP user.
# When SELinux is enforcing check for SE bool allow_ftpd_anon_write, allow_ftpd_full_access
anon_upload_enable=YES
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
anon_mkdir_write_enable=YES
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
# Activate logging of uploads/downloads.
xferlog_enable=YES
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES
# Enable passive mode.
pasv_enable=YES
pasv_min_port=10060
pasv_max_port=10070
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
chown_uploads=YES
chown_username=ftpuser
# You may override where the log file goes if you like. The default is shown
# below.
xferlog_file=/var/log/xferlog
# You may want your log file in standard ftpd xferlog format.
# Note that the default log file location is /var/log/xferlog in this case.
xferlog_std_format=YES
# You may change the default value for timing out an idle session.
idle_session_timeout=300
# You may change the default value for timing out a data connection.
data_connection_timeout=300
通过以上步骤，您应该能够定位并解决CentOS FTPServer的故障。如果问题仍然存在，请提供具体的错误信息以便进一步分析。
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