Installation and use of FTP, Telnet under Linux

1, the installation and use of FTP

Generally in the distribution of various Linux, the default with the FTP software is vsftp.

Use the following command #rpm-qa | grep VSFTPD can detect if the VSFTPD software is installed, and if it is not installed, install Yum search Vsftpdyum with the yum command vsftpd.x86_64

Start the service

Start ftp command #service vsftpd start

Stop FTP command #service vsftpd stop

Restart FTP command #service vsftpd restart

Configuration of the VSFTPD

There are three main FTP configuration files, which are located in the/etc/vsftpd/directory, respectively:

Ftpusers This file is used to specify that those users cannot access the FTP server.

User_list the default account that the file uses to indicate that the FTP is not accessible by default

Vsftpd.conf VSFTPD's master configuration file

Configure anonymous users to access

Anon_upload_enable=yes

Anon_mkdir_write_enable=yes

At this point, anonymous users can log on to upload and download files. Remember to restart the service after modifying the configuration file.

Creation and use of non-anonymous accounts

VSFTPD services are associated with system users, such as when we create a system user named Test, this user can implement a login with the default configuration

Issue: Connect to FTP server Tip "Oops:cannot change directory:/home/xxx"

Answer: This is related to SELinux settings

by Command Getsebool-a | grep ftp to view FTP security settings

Open FTP access to the user's home directory via command Setsebool Ftp_home_dir on

2. Telnet

Search the Telnet service to see which packages can be installed

Yum Search Telnet

Install Telnet Sever

Yum Install telnet-server.x86_64

Change the Telnet configuration file inside the/etc/xinetd.d/.

Service Telnet

{

Flags D =reuse

Socket_type =stream

Wait =no

User =root

Server =/usr/sbin/in.telnetd

Log_on_failure +=userid

Disable =no activates Telnet, if it is not used, it can be set to Yes

instances = 5 Sets the maximum number of connections.

}

Setting the Telnet port

Open the/etc/services file with the VI editor

The default port for Telnet is 23

Telnet 23/tcp

Telnet 23/UDP

You can make changes as needed

Start and stop Telnet

The Telnet service was handed over to xinetd to manage. So the system wants to install the XINETD service.

Start Telnet

/etc/init.d/xinetd restart

Installation and use of FTP, Telnet under Linux