Linux ssh password-free login

1. Generate Secret Key

① generate key file: ssh-keygen-t RSA, then you can always return to completion.

② this time, a. SSH directory is generated in the root directory, and you can see the generated key file by looking at the directory:

2. Install the public key

　　　　Cat Id_rsa. Pub >> authorized_keys

3, modify the permissions of the file, to ensure that you can have permission to execute

chmod Authorized_keys

chmod. SSH

　　

4, set up SSH, open key login function

① Modify Sshd_config File: Vim/etc/ssh/sshd_config

② Open the key login function, probably in the file of 35 lines, remove the previous # number can be:

　　

③ Restart SSH Service

Systemctl Restart sshd

5. Make Login Key file

① Copy the key file Id_rsa to the client

② open Puttygen, load in standalone actions, select our Id_rsa key

③ Click Save Private Key to save the secret key as a PPK file so that you can log in with the Putty secret key.

④ If you need a secret key for. Pub, you can use the generated id_rsa.pub directly

6. Close Password Login

① Verify that you can log on by using the secret key and then modify the Sshd_config file again: Vim/etc/ssh/sshd_config

② Disable password login:passwordauthentication No, at the bottom of the document, change Yes to no

③ Restart SSH Service

Linux ssh password-free login