Added swarm

swarm/README.md

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+* to install Docker swarm container:
+
+```docker run swarm --help```
+
+* To run the consul container on the manager node:
+
+```docker run -d -p 8500:8500 --name=consul progrium/consul -server -bootstrap```
+
+* To run the swarm manage node on the master:
+
+```docker run -d -p 4000:4000 swarm manage -H :4000 --advertise 192.168.0.248:4000 consul://192.168.0.248:8500 ```
+
+* To run swarm join on the agent2
+
+```docker run -d swarm join --advertise=192.168.0.246:2375 consul://192.168.0.248:8500```
+
+* To run swarm join on the agent3
+ 
+```docker run -d swarm join --advertise=192.168.0.247:2375 consul://192.168.0.248:8500```
+
+* see cluster status
+
+```docker -H :4000 info```
+
+* Run on a container on your swarm cluster:
+
+```docker -H :4000 run -p 3000:3000 -d wardviaene/nodejs-demo```
+
+* List containers:
+
+```docker -H :4000 ps```
+
+* Connect to the nodejs-demo container
+
+```curl 192.168.0.247:3000```
+

swarm/Vagrantfile

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+Vagrant.configure(2) do |config|
+  config.vm.define "manager" do |manager|
+    manager.vm.box = "bento/ubuntu-18.04"
+    manager.vm.network "private_network", ip: "192.168.0.248"
+    manager.vm.hostname = "manager.example.com"
+    manager.vm.provision "shell", path: "docker_install.sh"
+  end
+  config.vm.define "agent1" do |agent1|
+    agent1.vm.box = "bento/ubuntu-18.04"
+    agent1.vm.network "private_network", ip: "192.168.0.247"
+    agent1.vm.hostname = "docker-agent1.example.com"
+    agent1.vm.provision "shell", path: "docker_install.sh"
+  end
+  config.vm.define "agent2" do |agent2|
+    agent2.vm.box = "bento/ubuntu-18.04"
+    agent2.vm.network "private_network", ip: "192.168.0.246"
+    agent2.vm.hostname = "docker-agent2.example.com"
+    agent2.vm.provision "shell", path: "docker_install.sh"
+  end
+end

swarm/docker_install.sh

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+#!/bin/bash
+set -eux
+apt-get update
+apt-get install -y --no-install-recommends \
+        apt-transport-https \
+        ca-certificates \
+        curl \
+        software-properties-common \
+        python-minimal zip python-simplejson \
+        gnupg2 \
+        software-properties-common
+apt-get remove docker docker-engine docker.io
+# install docker
+curl -fsSL get.docker.com -o get-docker.sh
+sh get-docker.sh
+# install docker-compose
+curl -L "https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose && \
+    chmod +x /usr/local/bin/docker-compose
+# install docker-machine
+curl -L "https://github.com/docker/machine/releases/download/v0.15.0/docker-machine-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-machine && \
+    chmod +x /usr/local/bin/docker-machine
+apt-get -y install linux-image-extra-$(uname -r)
+usermod -aG docker vagrant
+echo 'DOCKER_OPTS="-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock"' >> /etc/default/docker
+service docker restart