==== SSH / rysnc without password ====

Make sure the same versions of ssh are on both machines. \\
You need to configure both client (machine connecting from) and server (machine connecting to). \\
On client, create ecdsa public and private keys (optionally you can also create rsa and dsa versions) with the following: \\
<code>
cd ~/.ssh
ssh-keygen -t ecdsa -f ~/.ssh/id_ecdsa
ssh-keygen -t rsa -f ~/.ssh/id_rsa
ssh-keygen -t dsa -f ~/.ssh/id_dsa
</code>
This creates id_ecdsa, id_ecdsa.pub, id_rsa, id_rsa.pub, id_dsa, id_dsa.pub - optionally can enter a 'passphrase' when prompted \\

From the client, copy the ssh public keys to the server using the following:

  ssh-copy-id username@remote_host
  
Follow the prompts.  If successful you should be able to ''ssh username@remote_host'' without a password now.

To do this process manually on the server: \\
<code>
cd ~/.ssh/
</code>
vi authorized_keys \\
Copy the id_dsa.pub and id_rsa.pub from client into authorized_keys file \\
Make sure permissions 600 on authorized_keys \\
Also:
<code>
chmod 0700 /home/<user's-home-directory>/.ssh -R
</code>

Repeat process for creating keys on server, and copy the .pub keys to the client's ~/.ssh/authorized_keys file. \\

Should now be able to connect without being prompted for password. \\

To restart sshd: kill running sshd process \\
now issue:
<code>/sbin/init.d/sshd
</code>

Or for RedHat systems:
<code>
service sshd restart
</code>