ssh rsync Linux

SSH Login Without Password 

Using ssh-keygen & ssh-copy-id

first  create public and private key pair  on  localhost 

[root@DC01-Alpha disk2]# ssh-keygen

then the key will be generated

Generating public/private rsa key pair.
Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key]
Enter passphrase (empty for no passphrase): [Press enter key]
Enter same passphrase again: [Pess enter key]
Your identification has been saved in /home/jsmith/.ssh/id_rsa.
Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub.
The key fingerprint is:

33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 jsmith@local-host

then Copy the public key to remote-host using ssh-copy-id

jsmith@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
jsmith@remote-host's password:
Now try logging into the machine, with "ssh 'remote-host'", and check in:

.ssh/authorized_keys

Login to remote-host without entering the password

jsmith@local-host$ ssh remote-host
Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2
[Note: SSH did not ask for password.]

jsmith@remote-host$ [Note: You are on remote-host here]

Now perfrom the  synchronization

 [root@yourcomputer]$rsync -progress -avhe ssh --delete /disk2/myfolder root@ip.add.re.ss:/disk2/ [Note: You are on local] 

This can be set to run automatically using  cron

http://www.thegeekstuff.com/2009/06/15-practical-crontab-examples/

source http://www.thegeekstuff.com/2010/09/rsync-command-examples/