http://blog.phymata.com/2016/08/05/joining-100-nodes-to-a-docker-swarm/

dockerize.sh

#!/bin/bash

export DEBIAN_FRONTEND=noninteractive

sed -i 's/#PasswordAuthentication yes/PasswordAuthentication no/g' /etc/ssh/sshd_config
service ssh restart

apt-get -y update
apt-get -y install fail2ban

apt-get -y install apt-transport-https ca-certificates
apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
echo "deb https://apt.dockerproject.org/repo ubuntu-xenial experimental" > /etc/apt/sources.list.d/docker.list

apt-get -y update
apt-get -y install linux-image-extra-$(uname -r)
apt-get -y install docker-engine=1.12.0~rc4-0~xenial

service docker start

dockerswarm100.sh

#!/bin/bash

set -euo pipefail

# Usage:
#   dockerswarm100.sh create
#   dockerswarm100.sh version
#   dockerswarm100.sh join {swarm-secret} {swarm-manager-ip}
#   dockerswarm100.sh info
#   dockerswarm100.sh delete
# Requirements:
#   Environment Variables:
#     export RS_USERNAME={my-rackspace-username}
#     export RS_API_KEY={my-rackspace-api-key}
#   rack: The Rackspace command line interface for managing Rackspace services
#     https://developer.rackspace.com/docs/rack-cli/configuration/#installation-and-configuration
#   Keypair named swarm
#     ssh-keygen -q -b 4096 -t rsa -N "" -f ~/.ssh/id_rsa.swarm
#     for region in ORD IAD; do
#       export RS_REGION_NAME=${region}
#       rack servers keypair upload --name swarm --file ~/.ssh/id_rsa.swarm.pub
#     done

main() {
  echo "$@"
  loop $@
}

loop() {
  for region in ORD IAD; do
    export RS_REGION_NAME=${region}
    echo -e "Region\t\t${RS_REGION_NAME}"

    for i in $(seq -f "%02g" 1 1); do
      SERVER_NAME=swarm-${i}
      echo -e "Name\t\t${SERVER_NAME}"
      "$@"
    done
  done
}

create() {
  rack servers instance create \
    --name ${SERVER_NAME} \
    --image-name "Ubuntu 16.04 LTS (Xenial Xerus) (PVHVM)" \
    --flavor-name "512MB Standard Instance" \
    --keypair swarm \
    --user-data dockerize.sh
}

delete() {
  rack servers instance delete --name ${SERVER_NAME}
}

version() {
  SERVER_IP=$(get_server_ip)
  DOCKER_VERSION=$(ssh -i ~/.ssh/id_rsa.swarm root@${SERVER_IP} docker version | grep Version | tail -n 1 | awk '{print $2}')
  echo -e "Version\t\t${DOCKER_VERSION}"
}

hello() {
  SERVER_IP=$(get_server_ip)
  ssh -i ~/.ssh/id_rsa.swarm root@${SERVER_IP} docker run alpine echo "Hello World"
}

join() {
  SWARM_SECRET=$1
  SWARM_MANAGER_IP=$2
  SERVER_IP=$(get_server_ip)
  ssh -i ~/.ssh/id_rsa.swarm root@${SERVER_IP} docker swarm join --secret ${SWARM_SECRET} ${SWARM_MANAGER_IP}:2377
}

leave() {
  SERVER_IP=$(get_server_ip)
  ssh -i ~/.ssh/id_rsa.swarm root@${SERVER_IP} docker swarm leave
}

info() {
  SERVER_IP=$(get_server_ip)
  ssh -i ~/.ssh/id_rsa.swarm root@${SERVER_IP} docker info | awk '/Swarm/,/Runtimes/' | sed '$ d'
}

get_server_ip() {
  echo $(rack servers instance get --name ${SERVER_NAME} --fields publicipv4 | awk '{print $2}')
}

main $@