What does ssh mean in linux

SSH in Linux is the abbreviation of "Secure Shell". It is a security protocol based on the application layer and transport layer. It is used for encrypted login between computers; ssh can both remotely connect to the server and You can use the ssh protocol to transmit data and provide a more secure SFTP service.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What does ssh mean in linux

Simply put, SSH (Secure Shell Protocol) is a network protocol used between computers encrypted login. By default, the SSH service provides two service functions. One is to provide a service similar to the telnet remote online server, that is, the SSH service. The other is the sftp-server, which is similar to the FTP service. It uses the SSH protocol to transmit data, providing a more secure SFTP service.

Reminder: The SSH client (ssh command) includes a very useful remote secure copy command scp, which also works through the ssh protocol.

SSH is the abbreviation of Secure Shell, developed by the Network Working Group of the IETF;

SSH is a security protocol based on the application layer. SSH is a more reliable protocol designed to provide security for remote login sessions and other network services. Using the SSH protocol can effectively prevent information leakage during remote management. SSH was originally a program on UNIX systems and quickly expanded to other operating platforms.

SSH, when used correctly, can close holes in your network. SSH clients are available for a variety of platforms. Almost all UNIX platforms—including HP-UX, Linux, AIX, Solaris, Digital UNIX, Irix, and others—can run SSH.

The ssh command is used to remotely log in to the Linux host.

Common format: ssh [-l login_name] [-p port] [user@]hostname
You can use man ssh to view more details.

If you do not specify a user, the root account will be used to log in by default

　　ssh 192.168.0.15

Specify the user:

　ssh -l root 192.168.0.15　ssh root@192.168.0.15

If you have modified the ssh login port, you can:

　ssh -p 521 192.168.0.15　ssh -l root -p 521 192.168.0.15　ssh -p 521 root@192.168.0.15

Additionally modify it Configuration file /etc/ssh/sshd_config, you can change the ssh login port and disable root login. Changing the port can prevent port scanning. (The file /etc/ssh/sshd_config is for the server, and /etc/ssh/ssh_config is for the client. Use the scanning port software nmap to install yum install nmap -y, nmap and ip or domain name -p 1-65535)

Edit configuration file:

vim /etc/ssh/sshd_config

Find #Port 22, remove the comment, and change it to a three-digit port:

Port 521

Find #PermitRootLogin yes, remove it Comment, modified to:

PermitRootLogin no

Restart sshd service:

　service sshd restart <#我喜欢用/etc/init.d/ssh restart因为这样不容易出错，可以tab到。

Successful restart: Stopping sshd: [ OK ]
Starting sshd: [ OK ]

Related recommendations: "Linux Video Tutorial"

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