Secure SSH, CVS, SCP without Password Prompt

1. Suppose the domain name of your server is server, and your login name loginname.
2. On the client, generate a public and private key.
   
   

   ssh-keygen -C loginname@server -t dsa

   When asked for a password, simply press return. 
   The private key is stored in ~/.ssh/id_dsa, and the public key in ~/.ssh/id_dsa.pub.
   Never give the private key away! 

3. Copy the public file to the server with
   
   

   scp ~/.ssh/id_dsa.pub loginname@server:~/

4. Login on the server with 
   
   

   ssh loginname@server

   append the copied file to ~/.ssh/authorized_keys with

   cat ~/id_dsa.pub >>~/.ssh/authorized_keys

5. If you want to enable this features on other servers, just repeat step 3 on each of the servers.
   
   
   That’s it! If you have done everything correctly, the next time you login via SSH or use CVS over SSH, you will not need to enter a password yet you have a secure connenction.
   
   In case this does not work check /var/log/auth.log or /var/log/secure for error on server machine. If you see
   
   

   Authentication refused: bad ownership or modes for directory /home/dave/.ssh

   This is bcoz of bad permission these can be fixed with below commands.

   chmod g-w /home/your_user
   chmod 700 /home/your_user/.ssh
   chmod 600 /home/your_user/.ssh/authorized_keys