FTP service and experiment

FTP Service concept

FTP（file Transfer Protocol, File transfer protocol ）, Is a typical C/S Application layer protocol of architecture , The file transfer function is realized by the client software and the server software ,FTP The connection between the client and the server is reliable , Connection oriented , It provides reliable guarantee for data transmission .

FTP The use of port

FTP It's a file transfer protocol , It supports two modes

                                                                    ①20 The port is used to transmit data

                                                                    ②21 Ports are used to establish connections

FTP The role of

Internet The protocol used to transfer files remotely on .

FTP experiment

One 、 Environmental requirements

a centos The system serves as ftp The server

One win10 System client

Two 、 Software installation

linux In the system , yes vsftpd Provide ftp Service for   yum -y install  vsftpd

3、 ... and 、 The configuration file

1、/etc/vsftpd/vsftpd.conf           ftp The main profile of the server

2、/etc/ pam.d/vsftpd                  No login user list , Default root Unable to land

3、/etc/vsftpd/user_list              You can set that only users in this list can log in , If the same user appears at the same time ftpusers and user_list Then the user is also forbidden to log in , Take the strictest Authority

4、/var /ftp                                ftp Root directory , Default login location

5、/var /ftp.pub                          ftp Root directory , One of the default login locations       

1、 Setup profile

[[email protected] etc]# vim /etc/vsftpd/vsftpd.conf 

anonymous_enable=YES          verify
12 anonymous_enable=YES         verify
19 write_enable=YES                    verify

29 anon_upload_enable=YES      uncomment , Turn on use

33 anon_mkdir_write_enable=YES    uncomment , Turn on use

129 anno_umask=022                            add to
130 anno_other_write_enable=YES      add to

explain ： 

anonymous_enable=YES            Enable anonymous user access , The default is on (FTP)

write_enable=YES                        Open server write permissions ( To upload , Must be turned on ). The default is on

anon_umask=022                        Set the permission mask for anonymous users to upload data ( Unmask ).

anon_upload_enable=YES          Allow anonymous users to upload files . Default annotated , Need to uncomment

anon_mkdir_write_enable=YES    Allow anonymous users to create ( Upload ) Catalog . Default annotated , Need to uncomment

anon_other_write_enable=YES    Allow others to delete 、 rename 、 Covering and other operations . Need to add

2、 Give authority i

 3、 Turn on FTP service

 4、 verification

from win10 On the login FTP The server

stay FTP Create file on , from WIN10 Check out  

since win10 End view

 

  download FTP Server files

Upload files ：

Four 、 Fault analysis

Many people have configured all the settings , Found only from ftp Upload and download files instead of uploading , It's time to check your selinux Is it closed ,selinux It will affect the experimental results . And form habits , Check whether the firewall is turned off before the experiment .

Method ：

If selinux No disable Then enter the configuration file for permanent modification   vim /etc/sysconfig/selinux

Shutdown and restart can take effect . This function enables uploading files to ftp Great influence .