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This article shows you what the functions of the ftp server in linux operation and maintenance are, the content is concise and easy to understand, and it will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

The editor would like to share with you the functions of ftp server in linux operation and maintenance. I believe most people still don't understand.

As one of the oldest protocols, Ftp is not widely used at present. It is mainly used to transfer files between server and client. Ftp protocol uses plaintext transmission protocol, which has some security risks. There is a vsftpd software on the linux system. Although this software has few functions, it focuses on security. It is recommended that you use this software as an ftp file transfer server. In addition, pure-ftpd is also commonly used.

The ftp server mainly has the following functions:

1. Let the client and server transfer and manage files. This is the most important function and core of ftp.

two。 Different levels of user identities. By default, Ftp has three different identities: entity users, visitors, and anonymous users. The three identities are different. Entity users have the highest privileges, and anonymous users may only have permission to browse files or may not have permission at all.

3. A directory that restricts user activity. This is also the core function of ftp to prevent other directory files on the server from being attacked. When you log in with your account password, you can only move under the account's home directory, and you can't enter other directories.

Transmission mode of ftp server

It's more complicated than ssh,ftp. Unlike ssh services, which only need to open one port, ftp services need two ports. The uses of these two ports are different. Typically, the server uses port 21 as the command channel and port 20 or other random port as the data transfer channel. Depending on how the data channel is established, it can be divided into two modes:

1. Active mode: the server initiates a connection with the client actively. In active mode, there are 20 ports for data transfer by default.

two。 Passive mode: the client initiates a connection to the server. The ports used in this mode are random and can be customized.

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