Linux Settings remote password-free login

1. Generate a public/private key pair

[[email protected] ~]# ssh-keygen-t rsa-p '

-P for the password,-p ' means the empty password, you can not use the-p parameter, so that three cars to enter, with-P on a return.
The command will generate a hidden file directory under the user/root/directory. SSH, using ls-a to view,/root/.ssh command holds a pair of keys Id_rsa and id_rsa.pub

2. Create the authorized_keys file and copy the Id_rsa.pub content into the file

[[email protected] ~]#  touch authorized_keys[[email protected] ~]#  cat/root/.ssh/id_rsa.pub >> Authorized_keys[[email protected] ~]#  chmod authorized_keys

　Authorized_keys the LEAST privilege if!!!

3. Modify the sshd configuration file/etc/ssh/sshd.conf, uncomment

#RSAAuthentication yes#pubkeyauthentication yes#authorizedkeysfile      . Ssh/authorized_keys

4. Restart sshd

[[email protected] ~]#  service sshd restart

5. Telnet with Id_rsa

Linux Settings remote password-free login