How to Use the Xshell key to log on to CentOS (password-less logon)

How to Use the Xshell key to log on to CentOS (password-less logon)

I recently attended a training session and talked about how to log on to CentOS with a key. This authentication method is more secure than logon with a user name and password, so you must learn about it. I have been using Xshell, and other terminal software will not be discussed. Please use Baidu. Next let's take a look at how to use Xshell to implement key authentication and log on to the CentOS system.

Open Xshell, Click Tools-> Create User Key Generation wizard

Select RSA as the key type. The key length is 2048 bits. Next Step

Prompt that you are generating the public key and private key pair. Next Step

Name the private key and set the password. Next Step

This is the generated public key. Save it and use it later. Click Finish.

Click Close to close your private key.

Next, log on to the system using the username and password, and make the following Configuration:

1. # Make sure that you use pwd in the user's home directory. I am logged on as root, so under/root.
2. # Check whether there is any. ssh hidden directory under your home directory. If there is any hidden directory, go directly to it. If not, create a new one.
3.  
4. Mkdir. ssh
5. # Creating a. ssh directory
6.  
7. Chmod 700.ssh
8. # Grant. ssh directory 700 permissions
9.  
10. Cd. ssh
11. # Enter the. ssh directory
12.  
13. Touch authorized_keys
14. # Create an authorized_keys File
15.  
16. Chmod 600 authorized_keys
17. # Grant authorized_keys file 600 Permissions
18.  
19. Vi authorized_keys
20. # Use vi to edit it

Press the I key to enter the editing mode, paste the Public Key generated by Xshell, save and exit.

1. Vi/etc/ssh/sshd_config
2. # Edit the sshd configuration file
3.  
4. Remove the # In front of the following two sentences
5. PubkeyAuthentication yes
6. AuthorizedKeysFile. ssh/authorized_keys
7.  
8. Change yes to no.
9. PasswordAuthenticationno
10.  
11. Save and exit.
12.  
13. Service sshd restart
14. # Restart the sshd service
15.  
16. PS: If you want to disable remote root login, remove the # PermitRootLogin yes statement and change the # to no.

Now let's try it. Enter the user name root.

Have you seen it? The password text box turns gray. Select the generated User Key, enter the password of the key, and click OK.

OK! It is not difficult to successfully implement the Xshell key authentication and log on. Please try it now.

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