SSH configuration and login command in Linux

First, if not installed, then apt-get install SSH on the command line

After a while, you can actually log on to the SSH service machine.

The command to open the SSH service is: sudo/etc/init.d/sshd restart (generate public-private key pair)

View SSH status command: sudo/etc/init.d/sshd status

If you do not start the sshd daemon, you only need: sudo/usr/sbin/sshd (no need to do each)

At logon time, the command: SSH (other IP)-L (the other machine has the user name)-p (port number)

Where the parameter-l-p are not required. If the current user name has the same name as the user on the other machine that you want to log on to, then the-l parameter is not required, and the port defaults to 22 and is usually not set.

Common format: SSH [-l login_name] [P port] [user@]hostname

More details can be viewed with ssh-h.

Example

Do not specify User:

SSH 192.168.0.11

Specify the User:

Ssh-l Root 192.168.0.11

SSH root@192.168.0.11

If you have modified the SSH login port

Ssh-p 12333 192.168.0.11

Ssh-l Root-p 12333 216.230.230.114

Ssh-p 12333 root@216.230.230.114

In addition, modify the profile/etc/ssh/sshd_config, you can change the SSH login port and prevent root login. Changing the port can prevent the port from being scanned.

Edit configuration file

Vim/etc/ssh/sshd_config

Find #port 22, remove the annotation, and modify it into a five-bit port:

Port 12333

Find #permitrootlogin Yes, remove the comment, and modify it to:

Permitrootlogin No

Restart the SSHD service:

Service sshd Restart

Aliases can be used by users to customize their commands. Edit Vim ~/.BASHRC

Alias ll = ' Ls-l '

SOURCE ~/.BASHRC command takes effect