docker-machine create script for any machine you can ssh into

docker-create.sh

#! /bin/bash

# To invoke with named arguments, use
# https://unix.stackexchange.com/a/129394/358706

REMOTE_USER="user"
REMOTE_EMAIL="your@email.here"
REMOTE_HOSTNAME="hostname_here"
REMOTE_KEYNAME="${REMOTE_HOSTNAME}.id.rsa"
REMOTE_IPADDRESS=`dig +short $REMOTE_HOSTNAME`
pushd ~/.ssh
ssh-keygen -t rsa -b 4096 -C "$REMOTE_EMAIL" -f "$REMOTE_KEYNAME"
ssh-copy-id -i "$REMOTE_KEYNAME" "$REMOTE_USER@$REMOTE_IPADDRESS"
docker-machine create \
    --driver generic \
    --generic-ip-address="$REMOTE_IPADDRESS" \
    --generic-ssh-user="$REMOTE_USER" \
    --generic-ssh-key "$REMOTE_KEYNAME" \
    $REMOTE_HOSTNAME
popd