Generate a key pair for Docker

generate_docker_cert.sh

#!/bin/sh
CERT_PATH="$HOME/.docker"
mkdir -p ${CERT_PATH}
if [ ! -f "$CERT_PATH/key.pem" ]; then
  echo "Generating a new certificate in $CERT_PATH..."
  openssl req -new -newkey rsa:4096 -days 3650 -nodes -x509 -subj "/C=US/ST=NewYork/L=NYC/O=Tutum/CN=tutum.user" -keyout ${CERT_PATH}/key.pem -out ${CERT_PATH}/cert.pem >/dev/null 2>&1
  echo "This is your new public certificate which you can add to your Tutum account:"
else
  echo "WARNING: An existing certificate has been found in $CERT_PATH"
  echo "This is your existing public certificate which you can add to your Tutum account:"
fi
cat ${CERT_PATH}/cert.pem