ssh into a remote host without password

Other than the regular password based login, one can use the public/private key based login to get into a remote server.

This is a two step process.

On the local host

1. ssh-keygen   // follow the prompts, enter nothing for the pass phrase. This will create a id_rsa.pub file in your .ssh folder. 

On the remote server

1. Log into the remote server. 
2. Create a .ssh folder if not already present. 
3. chmod 700 .ssh
4. cd .ssh
5. vim authorized_keys
6. Copy paste the contents of the id_rsa_pub file into the above file. 
7. save the authorized_keys file 
8. chmod 700 authorized_keys
9. exit and try to login again, you will not be prompted for a password.