No Password for ssh-based communication between hosts

No Password for ssh-based communication between hosts

Node1: 172.16.58.1

Node2: 172.16.58.3

Node1 --> node2

 

First, generate a key in node1.

 

 

Run ssh-keygen-p''

If you want to save the path, press enter to default,

The private key is saved as/root/. ssh/id_rsa.

Save the public key as/root/. ssh/id_rsa.pub

[root@node1 ~]# ssh-keygen -P ''Generating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa): 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:dc:62:ba:81:ac:dd:d9:93:fa:b4:9b:21:8d:e7:98:8c root@node1.magedu.comThe key's randomart image is:+--[ RSA 2048]----+|                 ||                 ||                 ||       . .       ||        S .      ||   . . = .       ||    o = =.       ||   o + %o+       ||  . E OoBo       |+-----------------+

Pass the key to the node2 host

 

ssh-copy-id -i .ssh/id_rsa.pub root@172.16.58.3[root@node1 ~]# ssh-copy-id -i .ssh/id_rsa.pubroot@172.16.58.3The authenticity of host '172.16.58.3 (172.16.58.3)' can'tbe established.RSA key fingerprint isdb:f8:11:fa:7d:30:95:44:1b:eb:ea:89:ee:fa:a1:27.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '172.16.58.3' (RSA) to the listof known hosts.root@172.16.58.3's password:Now try logging into the machine, with "ssh'root@172.16.58.3'", and check in:   .ssh/authorized_keys

To make sure we haven' t added extra keys thatyou weren't expecting.

Test whether password-free login is successful. No prompt is displayed for entering the password

Ssh 172.16.58.3 'date'; date

[Root @ node1 ~] # Ssh 172.16.58.3 'date'; date

Wed Dec 31 16:51:41 CST 2014

Wed Dec 31 16:52:42 CST 2014