How to configure server and client for SSH authentication without password.

1. On client generate a new key
   
   ssh-keygen -t rsa -b 2048 -v

   1	ssh-keygen -t rsa -b 2048 -v

   
   You will be asked to enter passphrase and key file name. I entered empty passphrase and dmitry key name
2. On client copy generated key to ~/.ssh folder
3. On client use ssh-copy-id command for adding generated pub key to server’s authorized keys.
   
   $ ssh-copy-id -i dmitry.pub user1@myserver1

   1	$ ssh-copy-id -i dmitry.pub user1@myserver1

4. On client edit ~/.ssh/config or create if not exists. Add following lines:
   
   Host * StrictHostKeyChecking no UserKnownHostsFile=/dev/null

   1 2 3

   Host *    StrictHostKeyChecking no    UserKnownHostsFile=/dev/null

5. On server, if you need to connect as root without password too, edit /etc/ssh/sshd_config, say yes to PermitRootLogin
   
   #PermitRootLogin without-password PermitRootLogin yes

   1 2	#PermitRootLogin without-password PermitRootLogin yes

   
   Then restart ssh
   
   service ssh restart

   1	service ssh restart

   
   Run visudo and edit line, starting from %sudo
   
   %sudo ALL=(ALL:ALL) NOPASSWD:ALL

   1	%sudo ALL=(ALL:ALL) NOPASSWD:ALL

6. Now you can connect server without password
   
   ssh user1@myserver1

   1	ssh user1@myserver1