Ftp服务器是用来传输文件的，日常中尤其是linux的系统维护我们都会用到。
废话不多说我们开始教程。
1.安装pure-ftp
默认的 yum 源没有提供 pure-ftpd，需要先安装 epel 扩展源：
yum install epel-release
yum install pure-ftpd
很简单，两条命令就可以搞定安装。
2.修改配置文件
安装完的配置文件，存在于etc/pure-ftpd/路径下。
地下是完整的配置文件说明，如果使用默热也是直接可以启动的，如果想匿名登陆等访问权限就需要修改配置了。
MinUID 1000 #如果这个数字比较小，就把它调大一点，否则如果建的用户的uid比这个数字小，会报“530 Login authentication failed”错误
AnonymousOnly no #只允许匿名用户登录。
NoAnonymous yes #不允许匿名用户登录
ProhibitDotFilesWrite no #不能删除/写入隐藏文件。如果ftp目录内有隐藏文件的话，改为yes。
ProhibitDotFilesRead no #禁止读取隐藏文件。如果ftp目录内有隐藏文件的话，改为yes。
PureDB /etc/pure-ftpd/pureftpd.pdb #用户数据库文件。我建好ftp之后这行配置默认是被注释掉的，所以我登录ftp一直报错“530 Login authentication failed”。因为没有启用用户数据库文件，ftp读取不到用户，所以这行一定要启用
完整的配置
# vim pure-ftpd.conf
############################################################
# Configuration file for pure-ftpd wrappers #
############################################################
# If you want to run Pure-FTPd with this configuration
# instead of command-line options, please run the
# following command :
#
# /usr/local/pureftpd/sbin/pure-config.pl /usr/local/pureftpd/etc/pure-ftpd.conf
#
# Please don't forget to have a look at documentation at
# http://www.pureftpd.org/documentation.shtml for a complete list of
# options.
# Cage in every user in his home directory
# 锁定所有用户到家目录中
ChrootEveryone yes
# If the previous option is set to "no", members of the following group
# won't be caged. Others will be. If you don't want chroot()ing anyone,
# just comment out ChrootEveryone and TrustedGID.
# 信任组ID100，可以不锁定
# TrustedGID 100
# Turn on compatibility hacks for broken clients
# 兼容不同客户端
BrokenClientsCompatibility no
# Maximum number of simultaneous users
# 最大的客户端数量
MaxClientsNumber 50
# Fork in background
# 后台运行
Daemonize yes
# Maximum number of sim clients with the same IP address
# 每个ip最大连接数
MaxClientsPerIP 8
# If you want to log all client commands, set this to "yes".
# This directive can be duplicated to also log server responses.
# 记录日志
VerboseLog no
# List dot-files even when the client doesn't send "-a".
# 显示隐藏文件
DisplayDotFiles no
# Don't allow authenticated users - have a public anonymous FTP only.
# 只允许匿名用户访问
AnonymousOnly no
# Disallow anonymous connections. Only allow authenticated users.
# 不允许匿名用户
NoAnonymous yes
# Syslog facility (auth, authpriv, daemon, ftp, security, user, local*)
# The default facility is "ftp". "none" disables logging.
# 设置日志的告警级别，默认为ftp，none是禁止记录日志
SyslogFacility ftp
# Display fortune cookies
# 定制用户登陆后的显示信息
# FortunesFile /usr/share/fortune/zippy
# Don't resolve host names in log files. Logs are less verbose, but
# it uses less bandwidth. Set this to "yes" on very busy servers or
# if you don't have a working DNS.
# 是否在日志文件中进行主机名解析，不进行客户端DNS解析
DontResolve yes
# Maximum idle time in minutes (default = 15 minutes)
# 最大空闲时间
MaxIdleTime 30
# LDAP configuration file (see README.LDAP)
# LDAP 配置文件路径
# LDAPConfigFile /etc/pureftpd-ldap.conf
# MySQL configuration file (see README.MySQL)
# MySQL 配置文件路径
MySQLConfigFile /usr/local/pureftpd/etc/pureftpd-mysql.conf
# Postgres configuration file (see README.PGSQL)
# Postgres 配置文件路径
# PGSQLConfigFile /etc/pureftpd-pgsql.conf
# PureDB user database (see README.Virtual-Users)
# PureDB 用户数据库路径
PureDB /usr/local/pureftpd/etc/pureftpd.pdb
# Path to pure-authd socket (see README.Authentication-Modules)
# pure-authd 的socket 路径
# ExtAuth /var/run/ftpd.sock
# If you want to enable PAM authentication, uncomment the following line
# 如果你要启用 PAM 认证方式, 去掉下面行的注释
# PAMAuthentication yes
# If you want simple Unix (/etc/passwd) authentication, uncomment this
# 如果你要启用 简单的 Unix系统 认证方式(/etc/passwd), 去掉下面行的注释
# UnixAuthentication yes
# Please note that LDAPConfigFile, MySQLConfigFile, PAMAuthentication and
# UnixAuthentication can be used only once, but they can be combined
# together. For instance, if you use MySQLConfigFile, then UnixAuthentication,
# the SQL server will be asked. If the SQL authentication fails because the
# user wasn't found, another try # will be done with /etc/passwd and
# /etc/shadow. If the SQL authentication fails because the password was wrong,
# the authentication chain stops here. Authentication methods are chained in
# the order they are given.
# 'ls' recursion limits. The first argument is the maximum number of
# files to be displayed. The second one is the max subdirectories depth
# 'ls' 命令的递归限制。第一个参数给出文件显示的最大数目。第二个参数给出最大的子目录深度。
LimitRecursion 10000 8
# Are anonymous users allowed to create new directories ?
# 是否允许匿名用户创建新目录
AnonymousCanCreateDirs no
# If the system is more loaded than the following value,
# anonymous users aren't allowed to download.
# 超出负载后禁止下载
MaxLoad 4
# Port range for passive connections replies. - for firewalling.
# 被动模式的端口范围
# PassivePortRange 30000 50000
# Force an IP address in PASV/EPSV/SPSV replies. - for NAT.
# Symbolic host names are also accepted for gateways with dynamic IP
# addresses.
# 强制一个IP地址使用被动响应
# ForcePassiveIP 192.168.0.1
# Upload/download ratio for anonymous users.
# 匿名用户的上传/下载的比率
# AnonymousRatio 1 10
# Upload/download ratio for all users.
# This directive superscedes the previous one.
# 所有用户的上传/下载的比率
# UserRatio 1 10
# Disallow downloading of files owned by "ftp", ie.
# files that were uploaded but not validated by a local admin.
# 禁止下载匿名用户上传但未经验证的文件
AntiWarez yes
# IP address/port to listen to (default=all IP and port 21).
# 服务监听的IP 地址和端口。(默认是所有IP地址和21端口)
# Bind 127.0.0.1,21
# Maximum bandwidth for anonymous users in KB/s
# 匿名用户带宽限制（KB）
# AnonymousBandwidth 8
# Maximum bandwidth for *all* users (including anonymous) in KB/s
# Use AnonymousBandwidth *or* UserBandwidth, both makes no sense.
# 所有用户的最大带宽（KB/s），包括匿名用户。
UserBandwidth 1024
# File creation mask. <umask for files>:<umask for dirs> .
# 177:077 if you feel paranoid.
# 新建目录及文件的属性掩码值
Umask 133:022
# Minimum UID for an authenticated user to log in.
# 认证用户允许登陆的最小组ID（UID）
MinUID 100
# Allow FXP transfers for authenticated users.
# 仅允许认证用户进行 FXP 传输。
AllowUserFXP no
# Allow anonymous FXP for anonymous and non-anonymous users.
# 对匿名用户和非匿名用户允许进行匿名 FXP 传输
AllowAnonymousFXP no
# Users can't delete/write files beginning with a dot ('.')
# even if they own them. If TrustedGID is enabled, this group
# will have access to dot-files, though.
# 不能删除/写入隐藏文件
ProhibitDotFilesWrite no
# Prohibit *reading* of files beginning with a dot (.history, .ssh...)
# 禁止读取隐藏文件
ProhibitDotFilesRead no
# Never overwrite files. When a file whose name already exist is uploaded,
# it get automatically renamed to file.1, file.2, file.3, ...
# 有同名文件时自动重新命名
AutoRename no
# Disallow anonymous users to upload new files (no = upload is allowed)
# 不允许匿名用户上传文件
AnonymousCantUpload no
# Only connections to this specific IP address are allowed to be
# non-anonymous. You can use this directive to open several public IPs for
# anonymous FTP, and keep a private firewalled IP for remote administration.
# You can also only allow a non-routable local IP (like 10.x.x.x) to
# authenticate, and keep a public anon-only FTP server on another IP.
# 仅允许来自以下IP地址的非匿名用户连接。你可以使用这个指令来打开几个公网IP来提供匿名FTP，
# 而保留一个私有的防火墙保护的IP来进行远程管理。你还可以只允许一内网地址进行认证，而在另外
# 一个IP上提供纯匿名的FTP服务。
#
#TrustedIP 10.1.1.1
# If you want to add the PID to every logged line, uncomment the following
# line.
# 如果你要为日志每一行添加 PID 去掉下面行的注释
#LogPID yes
# Create an additional log file with transfers logged in a Apache-like format :
# fw.c9x.org - jedi [13/Dec/1975:19:36:39] "GET /ftp/linux.tar.bz2" 200 21809338
# This log file can then be processed by www traffic analyzers.
# 使用类似于Apache的格式创建一个额外的日志文件
# AltLog clf:/var/log/pureftpd.log
# Create an additional log file with transfers logged in a format optimized
# for statistic reports.
# 使用优化过的格式为统计报告创建一个额外的日志文件
# AltLog stats:/var/log/pureftpd.log
# Create an additional log file with transfers logged in the standard W3C
# format (compatible with most commercial log analyzers)
# 使用标准的W3C格式创建一个额外的日志文件
# AltLog w3c:/var/log/pureftpd.log
# Disallow the CHMOD command. Users can't change perms of their files.
# 不接受 CHMOD 命令。用户不能更改他们文件的属性
#NoChmod yes
# Allow users to resume and upload files, but *NOT* to delete them.
# 允许用户恢复和上传文件，却不允许删除他们
#KeepAllFiles yes
# Automatically create home directories if they are missing
# 用户主目录不存在的话，自动创建
CreateHomeDir yes
# Enable virtual quotas. The first number is the max number of files.
# The second number is the max size of megabytes.
# So 1000:10 limits every user to 1000 files and 10 Mb.
# 限制用户可以创建的最大文件数和用户空间大小
Quota 10000:10240
# If your pure-ftpd has been compiled with standalone support, you can change
# the location of the pid file. The default is /var/run/pure-ftpd.pid
# PID文件位置
#PIDFile /var/run/pure-ftpd.pid
# If your pure-ftpd has been compiled with pure-uploadscript support,
# this will make pure-ftpd write info about new uploads to
# /var/run/pure-ftpd.upload.pipe so pure-uploadscript can read it and
# spawn a script to handle the upload.
# Don't enable this option if you don't actually use pure-uploadscript.
# 如果你的 pure-ftpd 编译时加入了 pure-uploadscript 支持，这个指令将会使 pure-ftpd
# 发送关于新上传的情况信息到 /var/run/pure-ftpd.upload.pipe，这样 pure-uploadscript
# 就能读然后调用一个脚本去处理新的上传
#
#CallUploadScript yes
# This option is useful with servers where anonymous upload is
# allowed. As /var/ftp is in /var, it save some space and protect
# the log files. When the partition is more that X percent full,
# new uploads are disallowed.
# 文件所在磁盘的最大使用率
MaxDiskUsage 99
# Set to 'yes' if you don't want your users to rename files.
# 是否允许重命名文件(默认不允许)
#NoRename yes
# Be 'customer proof' : workaround against common customer mistakes like
# 'chmod 0 public_html', that are valid, but that could cause ignorant
# customers to lock their files, and then keep your technical support busy
# with silly issues. If you're sure all your users have some basic Unix
# knowledge, this feature is useless. If you're a hosting service, enable it.
# 打开以防止用户犯常识性错误
CustomerProof yes
# Per-user concurrency limits. It will only work if the FTP server has
# been compiled with --with-peruserlimits (and this is the case on
# most binary distributions) .
# The format is : <max sessions per user>:<max anonymous sessions>
# For instance, 3:20 means that the same authenticated user can have 3 active
# sessions max. And there are 20 anonymous sessions max.
# 单个用户限制：每一个用户最大允许的进程；最大的匿名用户进程
# PerUserLimits 3:20
# When a file is uploaded and there is already a previous version of the file
# with the same name, the old file will neither get removed nor truncated.
# Upload will take place in a temporary file and once the upload is complete,
# the switch to the new version will be atomic. For instance, when a large PHP
# script is being uploaded, the web server will still serve the old version and
# immediatly switch to the new one as soon as the full file will have been
# transfered. This option is incompatible with virtual quotas.
# NoTruncate yes
# This option can accept three values :
# 0 : disable SSL/TLS encryption layer (default).
# 1 : accept both traditional and encrypted sessions.
# 2 : refuse connections that don't use SSL/TLS security mechanisms,
# including anonymous sessions.
# Do _not_ uncomment this blindly. Be sure that :
# 1) Your server has been compiled with SSL/TLS support (--with-tls),
# 2) A valid certificate is in place,
# 3) Only compatible clients will log in.
# TLS 1
# List of ciphers that will be accepted for SSL/TLS connections
# Prefix with -S: in order to totally disable SSL but not TLS.
# TLSCipherSuite HIGH:MEDIUM:+TLSv1:!SSLv2:+SSLv3
# Listen only to IPv4 addresses in standalone mode (ie. disable IPv6)
# By default, both IPv4 and IPv6 are enabled.
# IPV4Only yes
# Listen only to IPv6 addresses in standalone mode (ie. disable IPv4)
# By default, both IPv4 and IPv6 are enabled.
# IPV6Only yes
# UTF-8 support for file names (RFC 2640)
# Define charset of the server filesystem and optionnally the default charset
# for remote clients if they don't use UTF-8.
# Works only if pure-ftpd has been compiled with --with-rfc2640
# FileSystemCharset big5
# ClientCharset big5
3、启动pureftp
启动pureftp
systemctl start pure-ftpd.service
停止pureftp
systemctl stop pure-ftpd.service
重启pureftp
systemctl restart pure-ftpd.service
查看pureftp状态
systemctl status pure-ftpd.service
设置pureftp开机启动
systemctl enable pure-ftpd.service
启动成功
4.创建ftp主文件夹
在tmp的文件下建立ftp主文件夹，这个看个人习惯，想在哪都可以！
mkdir /tmp/ftp
5、建ftp用户
pureftp的用户比较特殊，它有一个虚拟用户的概念，虚拟用户是挂靠在真实用户下面的，因此具备和真实用户一样的读写权限。
5.1创建用户组
groupadd ftpgroup
5.2创建系统用户
useradd zabbx -g ftpgroup -d /tmp/ftp -s /sbin/nologin
5.3创建pureftp虚拟用户，并配置好密码
pure-pw useradd dongzao -u zabbx -g ftpgroup -d /tmp/ftp #创建zabbx的虚拟用户dongzao。
Password:
Enter it again:
5.4修改 FTP 文件夹目录权限
chmod 755 /tmp/ftp
5.5 创建用户信息数据库文件，list显示用户列表
创建pure-ftpd的数据库
pure-pw mkdb
查看pure-ftpd用户
pure-pw list
5.6 删除pure-ftpd用户
pure-pw userdel[-f] [-m]
这时，用户的信息会被从指定的 passwd 文件中删除，但是用户的 home 目录会被保留，需要手工删除。
5.7 修改pure-ftpd用户
pure-pw passwd[-f] [-m]
5.8 显示pure-ftpd用户信息
在 /etc/pureftpd.passwd 文件中记录的信息，但不方便用户的阅读，因此 pure-ftpd 提供了显示用户信息的命令。其语法是：
pure-pw show[-f]
注：5.6-5.7 只是为了做个记录，需要的使用。
6. 测试
我们使用FileZilla,来连接测试。
直接登录成功
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