Install Docker on Ubuntu 14.04 with UFW

install-docker-ufw.sh

#!/bin/bash

set -e
apt-get update
# Install iptables-persistent
apt-get install -y iptables-persistent

# Enable UFW forwarding and open TCP port 2375
ufw enable
sed -i 's/\(DEFAULT_FORWARD_POLICY\)="DROP"/\1="ACCEPT"/g' /etc/default/ufw
ufw allow 22/tcp 2375/tcp
ufw reload

# Save iptables ruls
service iptables-persistent save

# Install docker and dependencies
[ -e /usr/lib/apt/methods/https ] || {
    apt-get update
    apt-get install apt-transport-https
}

apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 \
    --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
curl -sSL https://get.docker.com/ubuntu/ | sh