how to ssh login without password

2 Answer(s)
Copy or transfer the public key to remote-host using ssh-copy-id command. 
It will append the indicated identity file to ~/.ssh/authorized_keys on other server. 
let's have an example 192.168.0.5.

# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.0.5
root@192.168.0.5's password:
Now try logging into the machine, with "ssh '192.168.0.5'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

 

Answered on August 3, 2021.

This really helps me a lot.

on August 4, 2021.
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Setup SSH Login Without Password on CentOS and RHEL.

This steps tested on CentOS 5/6/7, RHEL 5/6/7 and Oracle Linux 6/7.

Node1 : 192.168.0.9
Node2 : 192.168.0.10

Step One :
Test the connection and access from node1 to node2 :

[root@node1 ~]# ssh root@192.168.0.10
The authenticity of host '192.168.0.10 (192.168.0.10)' can't be established.
RSA key fingerprint is 6d:8f:63:9b:3b:63:e1:72:b3:06:a4:e4:f4:37:21:42.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.10' (RSA) to the list of known hosts.
root@192.168.0.10's password:
Last login: Thu Dec 10 22:04:55 2015 from 192.168.0.1
[root@node2 ~]#

Step Two :
Generate public and private keys using ssh-key-gen. Please take note that you can increase security by protecting the private key with a passphrase.

[root@node1 ~]# 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:
b4:51:7e:1e:52:61:cd:fb:b2:98:4b:ad:a1:8b:31:6d root@node1.ehowstuff.local
The key's randomart image is:
+--[ RSA 2048]----+
|          . ++   |
|         o o  o  |
|        o o o  . |
|       . o + ..  |
|        S   .  . |
|         .   .. .|
|        o E oo.o |
|         = ooo.  |
|        . o.o.   |
+-----------------+

Step Three :
Copy or transfer the public key to remote-host using ssh-copy-id command. It will append the indicated identity file to ~/.ssh/authorized_keys on node2 :

[root@node1 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.0.10
root@192.168.0.10's password:
Now try logging into the machine, with "ssh '192.168.0.10'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

Step Four :
Try SSH login without Password to node2 :

[root@node1 ~]# ssh root@192.168.0.10
Last login: Sun Dec 13 14:03:20 2015 from www.ehowstuff.local

 

Answered on August 3, 2021.
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