Guide to create and install an RSA key onto a remote machine.

create_rsa_key_and_install_guide.sh

#!/bin/bash

# Create an rsa key and install on a remote machine.

echo "This is a guide. Do not execute this as a script."
exit -1

# Create a new rsa key and deploy to a server. Make sure to add a password.
ssh-keygen -t rsa -C "username@host"

# Prepare the ssh directory on the host.
ssh username@host
mkdir -p ~/.ssh
touch ~/.ssh/authorized_keys
chmod 700 ~/.ssh && chmod 600 ~/.ssh/*

# Move the key to the server.
cat key.pub | ssh username@host 'cat - >> ~/.ssh/authorized_keys'

# Alternative move method, 'brew install ssh-copy-id'
ssh-copy -i key.pub username@host

# Log in once using the key.
ssh username@host -i private_key

# Apply the password and should be able to log in without a password.

# Useful reference resource.
# https://kb.mediatemple.net/questions/1626/Using+SSH+keys+on+your+server