ssh login without password

 

Step 1: Create public and private keys using ssh-key-gen on local-host 

$ ssh-keygen

followed by a few "enter".

Note: Generate ~/.ssh/id_rsa.pub

Step 2: Copy the public key to remote-host using ssh-copy-id

#  Assume: 1.2.3.4 is remote-host IP address
$ ssh-copy-id   -i     ~/.ssh/id_rsa.pub      1.2.3.4  

Note: ssh-copy-id appends the keys to the remote-host’s .ssh/authorized_key.

Step 3: Login to remote-host without entering the password

#  Assume: user3 is a user name.
$ ssh user3@1.2.3.4