SSH Login to another host without password using ssh-keygen
How To Setup SSH equivalence
If you have multiple hosts with the same user on them you can setup ssh equivalence so you can ssh from one host to another without a password. This is also help for scp commands.
First you will need to create an ssh-key, make sure you run this as the regular user and not root
$ ssh-keygen -t rsa
The keys just generated is placed in the users home directory
Then you will use the bash script ssh-copy-id.sh to copy the key you just created to a remote host you would like to login to without a password.
$ ./ssh-copy-id.sh user@host
When you run the ssh-copy-id.sh you will be prompted to login to the remote host with your user.
That is it, now when you ssh user@host you will not need to enter a password.
If you need a copy of the ssh-copy-id.sh script, here are the contents which can also be found here on git