Add SSH key to remote node.

passwordless_entry.sh

#!/bin/sh

echo "What is your node's username?"
read REMOTE_USER_NAME

echo "What is your node's IP address (or hostname)?"
read IP_ADDRESS

ssh "$REMOTE_USER_NAME@$IP_ADDRESS" 'mkdir -p ~/.ssh && chmod 700 ~/.ssh && touch .ssh/authorized_keys'

echo "==================================================================="
echo " node :: ssh key directory created for user \"$REMOTE_USER_NAME\": "
echo "           with 700 file permissions. "
# echo "$(ssh "$REMOTE_USER_NAME@$IP_ADDRESS" 'ls -la  .ssh')"
echo "==================================================================="
cat $HOME/.ssh/id_ecdsa.pub | ssh "$REMOTE_USER_NAME@$IP_ADDRESS" 'cat >> .ssh/authorized_keys | chmod 600 .ssh/authorized_keys'

echo "==================================================================="
echo " node :: ssh keys added to \"$REMOTE_USER_NAME@$IP_ADDRESS\" .ssh/authorized_keys"
echo "           with 600 file permissions. "
# echo "$(ssh "$REMOTE_USER_NAME@$IP_ADDRESS" 'ls -la  .ssh/authorized_keys')"
echo "==================================================================="
echo " logout (exit) and "
echo " SSH back in (without a password) to confirm your key is being read."