一、FTP介绍

FTP（File Transfer Protocol，文件传输协议）是 TCP/IP 协议组中的协议之一。FTP协议包括两个组成部分，其一为FTP服务器，其二为FTP客户端。默认情况下FTP协议使用TCP端口中的 20和21这两个端口，其中20用于传输数据，21用于传输控制信息。但是，是否使用20作为传输数据的端口与FTP使用的传输模式有关，如果采用主动模式，那么数据传输端口就是20；如果采用被动模式，则具体最终使用哪个端口要服务器端和客户端协商决定。

二、环境介绍

FTP服务端：hostname为control IP：192.168.200.150
FTP客户端：hostname为node1 IP： 192.168.200.135

三、FTP服务端搭建步骤

1.安装相关软件包

[root@control ~]# yum -y install ftp.x86_64
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Last metadata expiration check: 0:01:45 ago on Tue 11 May 2021 06:57:05 PM CST.
Dependencies resolved.
====================================================================================================================================================================Package                            Arch                                  Version                                    Repository                                Size
====================================================================================================================================================================
Installing:ftp                                x86_64                                0.17-78.el8                                AppStream                                 70 kTransaction Summary
====================================================================================================================================================================
Install  1 PackageTotal size: 70 k
Installed size: 112 k
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transactionPreparing        :                                                                                                                                            1/1 Installing       : ftp-0.17-78.el8.x86_64                                                                                                                     1/1 Running scriptlet: ftp-0.17-78.el8.x86_64                                                                                                                     1/1 Verifying        : ftp-0.17-78.el8.x86_64                                                                                                                     1/1
Installed products updated.Installed:ftp-0.17-78.el8.x86_64                                                                                                                                            Complete!

2.启动FTP并检查状态

[root@control ~]# systemctl enable --now vsftpd
Created symlink /etc/systemd/system/multi-user.target.wants/vsftpd.service → /usr/lib/systemd/system/vsftpd.service.
[root@control ~]# systemctl status vsftpd
● vsftpd.service - Vsftpd ftp daemonLoaded: loaded (/usr/lib/systemd/system/vsftpd.service; enabled; vendor preset: disabled)Active: active (running) since Tue 2021-05-11 18:59:51 CST; 9s agoProcess: 2825 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf (code=exited, status=0/SUCCESS)Main PID: 2826 (vsftpd)Tasks: 1 (limit: 24900)Memory: 864.0KCGroup: /system.slice/vsftpd.service└─2826 /usr/sbin/vsftpd /etc/vsftpd/vsftpd.confMay 11 18:59:51 control systemd[1]: Starting Vsftpd ftp daemon...
May 11 18:59:51 control systemd[1]: Started Vsftpd ftp daemon.

3.检查服务端口运行状态

[root@control mail]# netstat -antup | grep ftp
tcp6       0      0 :::21                   :::*                    LISTEN      2826/vsftpd

4.修改FTP配置文件

anonymous_enable=YES
local_enable=YES
write_enable=YES
local_umask=022
anon_upload_enable=YES
anon_mkdir_write_enable=YES
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_std_format=YES
listen=YES
listen_ipv6=NOpam_service_name=vsftpd
userlist_enable=YES

5.关闭selinux及防火墙

 sed -i 's/SELINUX=enforcing/SELIUNUX=disabled/' /etc/selinux/configsystemctl stop firewalld.service

备注：
防火墙如果要开启，则可开启以下端口：

firewall-cmd --zone=public --add-port=20/tcp --permanent
firewall-cmd --zone=public --add-port=21/tcp --permanent
firewall-cmd --zone=public --add-port=22/tcp --permanent
firewall-cmd --zone=public --add-port=30000-35000/tcp --permanent

三、客户端操作

1.安装软件包

[root@node1 ~]# yum -y install lftp
Updating Subscription Management repositories.
Unable to read consumer identity
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Repository AppStream is listed more than once in the configuration
Repository BaseOS is listed more than once in the configuration
ansiable                                                                                                                            0.0  B/s |   0  B     00:00
Failed to synchronize cache for repo 'ansiable', ignoring this repo.
Last metadata expiration check: 0:00:17 ago on Tue 11 May 2021 07:04:23 PM CST.
Dependencies resolved.
====================================================================================================================================================================Package                            Arch                                 Version                                      Repository                               Size
====================================================================================================================================================================
Installing:lftp                               x86_64                               4.8.4-1.el8                                  AppStream                               885 kTransaction Summary
====================================================================================================================================================================
Install  1 PackageTotal size: 885 k
Installed size: 3.0 M
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transactionPreparing        :                                                                                                                                            1/1 Installing       : lftp-4.8.4-1.el8.x86_64                                                                                                                    1/1 Running scriptlet: lftp-4.8.4-1.el8.x86_64                                                                                                                    1/1 Verifying        : lftp-4.8.4-1.el8.x86_64                                                                                                                    1/1
Installed products updated.Installed:lftp-4.8.4-1.el8.x86_64                                                                                                                                           Complete!

2.查看客户端状态

[root@node1 ~]# ps -ef |grep ftp
root       1746   1745  0 18:56 ?        00:00:00 /usr/libexec/openssh/sftp-server

四.客户端测试登录情况

1.使用客户端本地账号user1登录

lftp 192.168.200.150:~> pwd
ftp://192.168.200.150
lftp 192.168.200.150:~> user user1
Password:
lftp user1@192.168.200.150:~> ls
-rw-r--r--    1 0        0            3541 May 11 13:08 passwd
lftp user1@192.168.200.150:~> pwd
ftp://user1@192.168.200.150/%2Fhome/user1

2.测试上传下载文件

[root@node1 ~]# lftp 192.168.200.150
lftp 192.168.200.150:~> user user1
Password:
lftp user1@192.168.200.150:~> ls
-rw-r--r--    1 0        0            3541 May 11 13:08 passwd
lftp user1@192.168.200.150:~> lcd /etc
lcd ok, local cwd=/etc
lftp user1@192.168.200.150:~> put group
1154 bytes transferred
lftp user1@192.168.200.150:~> get passwd
get: /etc/passwd: file already exists and xfer:clobber is unset

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