3 Steps to Perform SSH Login Without Password

3 Steps to Perform SSH Login Without Password

[root@CentOS ~]# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

78:3c:b3:40:39:24:d3:5e:73:a4:83:c6:72:b9:74:72 root@CentOS

The key's randomart image is:

+--[ RSA 2048]----+

|    o..  ..      |

|     =.+o..      |

|    ..%.Eo       |

|     *.O .       |

|      + S        |

|       o +       |

|        .        |

|                 |

|                 |

+-----------------+

[root@CentOS ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.1.17

/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys

root@192.168.1.17's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh '192.168.1.17'"

and check to make sure that only the key(s) you wanted were added.

[root@CentOS ~]# ssh 192.168.1.17

Last login: Thu May 25 03:26:16 2017 from 192.168.1.12

[root@nodeAns ~]#

On node public keys locate in file /root/.ssh/authorized_keys

# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.1.17

On server (for local connection to 127.0.0.1) /root/.ssh/authorized_keys 

# ssh-copy-id -i ~/.ssh/id_rsa.pub 127.0.0.1

Rember!! Files have permission  700