install docker engine for swarm3k on Ubuntu 16.04. 2 options for installing

install-docker.sh

#!/bin/sh
# option 2: paste this into user-data to automate install via boot script
# NOTE: update --label=owner=YOURNAME below if you want to easily identify yours

# renames the host to have a suffix of alexellisio
export original=$(cat /etc/hostname)
sudo hostname $original-alexellisio
echo $original-alexellisio | sudo tee /etc/hostname

apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
mkdir -p /etc/apt/sources.list.d
echo deb https://apt.dockerproject.org/repo ubuntu-xenial main > /etc/apt/sources.list.d/docker.list

printf 'net.ipv4.neigh.default.gc_thresh1 = 30000\nnet.ipv4.neigh.default.gc_thresh2 = 32000\nnet.ipv4.neigh.default.gc_thresh3 = 32768' >> /etc/sysctl.conf
sysctl -p

service lxcfs stop
apt-get remove -y -q lxc-common lxcfs lxd lxd-client

apt-get update -q

apt-get install -y -q linux-image-extra-$(uname -r) linux-image-extra-virtual

apt-get install -y -q docker-engine=1.12.3*

systemctl start docker.service

mkdir -p /etc/systemd/system/docker.service.d
printf '[Service]\nExecStart=\nExecStart=/usr/bin/dockerd -H fd:// --label=owner=alexellisio --storage-driver aufs' > /etc/systemd/system/docker.service.d/options.conf
systemctl daemon-reload
systemctl restart docker.service

usermod ubuntu -aG docker 

docker swarm join \
    --advertise-addr $(curl http://169.254.169.254/latest/meta-data/public-ipv4) \
    --token SWMTKN-1-29tx6z2k8zmsbt9z2c2ay54jc9ce2l94ixhmmagveifv3pp4fa-5e8i9gugpb9b4bmi9vrp7m5su \
    67.205.160.45:2377

leave-and-join.sh

#!/bin/bash

systemctl daemon-reload
systemctl restart docker.service
docker swarm leave --force

docker swarm join \
    --advertise-addr $(curl https://api.ipify.org/?format=text) \
    --token SWMTKN-1-29tx6z2k8zmsbt9z2c2ay54jc9ce2l94ixhmmagveifv3pp4fa-5e8i9gugpb9b4bmi9vrp7m5su \
    67.205.160.45:2377
    

renamehost.sh

#!/bin/sh

export original=$(cat /etc/hostname)
sudo hostname $original-alexellisio
echo $original-alexellisio | sudo tee /etc/hostname