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How to setup SSH on Linux

By: Anton Locsin
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Date Added : July 26, 2010 Views : 232



SSH is very much similar to telnet. SSH is a shell program which allows a user remote access and the ability to execute commands over a network. SSH ensures solid data communication by protecting networks from IP and DNS spoofing.

SSH is readily available in most Linux distributions. However, there are some cases where you still need to setup SSH on Linux. The following are the steps on how to setup SSH on Linux.

The first step is to access SSH with the input

$ ssh username@nameofthecomputer

After running and connecting to a remote computer using a username and password, you need to set up the keys for SSH so that the next time you log in, there will no more password prompt.

The initial step is to set up the public and private keys, its commands, and place them in a separate folder named .ssh in your home directory. You may create a separate folder with the input below.

$ mkdir .ssh

The next step is to create both public and private keys. Input the following below then press enter




$ ssh-keygen  -t nameofthekey


This will create the 'id_nameofthekey (private key)' and 'id_nameofthekey.pub (public key)' inside of the .ssh folder.  You may then change the settings of the private keys with the following command.


$ chmod 600

.ssh/nameofthekey


The command will make the keys readable only to the user. You must then copy and install the public keys to the remote computer.  Using the remote computer, you can copy the file using a pre-installed program by running:


$ scp

.ssh/id_nameofthekey.pub username@nameofthecomputer


You need to input the username and password that was associated with the keys. This will allow a remote computer to access and create a .ssh folder. The next step is to add permission with the following command.


$ chmod 700.ssh


Inside the home directory, type the following to install the public key:


$ cat  id_nameofthekey.pub >>  .ssh/nameoftheauthorized_key


You can now run SSH and test if you have successfully set up a password-free connection for a certain user.


This is one of the basic ways on how to setup SSH on Linux. Other tutorials may be a bit more complicated because at time you need experience when it comes to shell programming. However, with experience and practice, you will be able to set up complicated commands using SSH. All you need is determination and willingness to learn.






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