how to make passwordless communication between multiple hosts

 

Sub: while doing cluster environment we required multiple nodes. hence for this, all servers should communicate with each other without credentials 

EX: for example, three nodes like host1, host2, and host3 are 3 servers

when you are in host1 terminal you can directly be moved to host2 without any new terminal by

 > ssh host2  [ now without asking password you will be moved to host2 from host1 ]


Setup :


1.  vi /etc/hosts

2.    Adding related hosts  in all places.

Ie., 

hostip1 hostname1 

hostip2 hostname2

hostip3 hostname3

3. SSH communication  [Generate SSH key passwordless]

 

[root@Host1]# ssh-keygen -t rsa

Generating public/private rsa key pair.

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

/root/.ssh/id_rsa already exists.

Overwrite (y/n)? y

Enter passphrase (empty for no passphrase):

New Section 1 Page 3

Enter passphrase (empty for no passphrase):


4.  ssh-copy-id root@hostname.com

The authenticity of host 'hostname.com (-.-.-.ip)' can't be established.

ECDSA key fingerprint is 4b:40:c5:15:7b:80:dc:ab:db:36:80:47:9a:30:d8:7a.

Are you sure you want to continue connecting (yes/no)? yes

/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@host2.informatica.com's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@hostname.com'"

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


5. Similarly do it for cluster also…


 


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