Add Consul support

Add files to build Consul cluster as discovery backend for Docker Swarm cluster

docker-swarm-ha/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Specify Vagrant version, Vagrant API version, and Vagrant clone location
+Vagrant.require_version '>= 1.6.0'
+VAGRANTFILE_API_VERSION = '2'
+ENV['VAGRANT_VMWARE_CLONE_DIRECTORY'] = '~/.vagrant'
+ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_fusion'
+#ENV['VAGRANT_DEFAULT_PROVIDER'] = 'vmware_appcatalyst'
+
+# Require 'yaml' module
+require 'yaml'
+
+# Read YAML file with VM details (box, CPU, RAM, IP addresses)
+# Be sure to edit servers.yml to provide correct IP addresses
+servers = YAML.load_file('servers.yml')
+
+# Create and configure the VMs
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+
+  # Always use Vagrant's default insecure key
+  config.ssh.insert_key = false
+
+  # Iterate through entries in YAML file to create VMs
+  servers.each do |server|
+    config.vm.define server['name'] do |srv|
+
+      # Don't check for box updates
+      srv.vm.box_check_update = false
+
+      # Specify hostname and Vagrant box
+      srv.vm.hostname = server['name']
+      srv.vm.box = server['box']
+
+      # Assign an additional static private network
+      srv.vm.network 'private_network', ip: server['priv_ip']
+
+      # Specify default synced folder; requires VMware Tools
+      srv.vm.synced_folder '.', '/vagrant', disabled: true
+
+      # Copy in the Consul configuration files
+      srv.vm.provision 'file', source: 'server.json', destination: '/home/vagrant/config.json'
+      srv.vm.provision 'file', source: 'consul.conf', destination: '/home/vagrant/consul.conf'
+
+      # Provision consul to the VMs
+      srv.vm.provision 'shell', path: 'consul.sh'
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml
+      srv.vm.provider :vmware_fusion do |vmw|
+        vmw.vmx['memsize'] = server['ram']
+        vmw.vmx['numvcpus'] = server['vcpu']
+      end # srv.vm.provider vmware_fusion
+
+      # Configure VMs with RAM and CPUs per settings in servers.yml
+      srv.vm.provider :vmware_appcatalyst do |vmw|
+        vmw.vmx['memsize'] = server['ram']
+        vmw.vmx['numvcpus'] = server['vcpu']
+      end # srv.vm.provider vmware_appcatalyst
+    end # config.vm.define
+  end # servers.each
+end # Vagrant.configure

docker-swarm-ha/consul.conf

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+description "Consul server process"
+
+start on runlevel [2345]
+stop on runlevel [!2345]
+
+respawn
+
+script
+  if [ -f "/etc/service/consul" ]; then
+    . /etc/service/consul
+  fi
+
+export GOMAXPROCS=`nproc`
+
+exec /usr/local/bin/consul agent \
+  -config-dir="/etc/consul.d/server" \
+  ${CONSUL_FLAGS} \
+  >>/var/log/consul.log 2>&1
+end script

docker-swarm-ha/consul.sh

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+#!/bin/bash
+
+# Update list of packages
+export DEBIAN_FRONTEND=noninteractive
+sudo apt-get update
+
+# Install packages as needed
+if [[ ! -e /usr/bin/curl ]]; then
+  apt-get -yqq install curl
+fi
+
+if [[ ! -e /usr/bin/unzip ]]; then
+  apt-get -yqq install unzip
+fi
+
+# Download and install Consul binary, if needed
+if [[ ! -e /usr/local/bin/consul ]];then
+
+  # Download Consul
+  curl -kLO https://dl.bintray.com/mitchellh/consul/0.5.2_linux_amd64.zip
+
+  # Decompress and remove Consul download
+  unzip 0.5.2_linux_amd64.zip
+  rm 0.5.2_linux_amd64.zip
+
+  # Move Consul binary to location in path
+  sudo mv consul /usr/local/bin/
+fi
+
+# Create consul user, if it doesn't already exist
+if [ -z "$(getent passwd consul)" ]; then
+  useradd -M -d /var/consul -r -s /usr/bin/nologin consul
+ else
+   echo "Consul user already created."
+ fi
+
+# Create and configure Consul working directory
+sudo mkdir -p /var/consul
+if [ -d /var/consul ]; then
+  sudo chown -R consul:consul /var/consul
+fi
+
+# Create and configure Consul configuration directories
+sudo mkdir -p /etc/consul.d/server
+if [ -d /etc/consul.d ]; then
+  sudo chown -R root:consul /etc/consul.d
+fi
+
+# Move files into the correct locations
+sudo mv /home/vagrant/consul.conf /etc/init/consul.conf
+sudo chown root:root /etc/init/consul.conf
+sudo mv /home/vagrant/config.json /etc/consul.d/server/config.json
+sudo chown root:consul /etc/consul.d/server/config.json

docker-swarm-ha/server.json

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+{
+	"bootstrap": false,
+	"server": true,
+	"datacenter": "dc1",
+	"data_dir": "/tmp",
+	"log_level": "INFO",
+	"enable_syslog": true,
+	"start_join": ["192.168.100.101", "192.168.100.102", "192.168.100.103"]
+}

docker-swarm-ha/servers.yml

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+---
+- name: "consul-01"
+  box: "slowe/ubuntu-trusty-x64"
+  ram: "512"
+  vcpu: "1"
+  priv_ip: 192.168.100.101
+- name: "consul-02"
+  box: "slowe/ubuntu-trusty-x64"
+  ram: "512"
+  vcpu: "1"
+  priv_ip: 192.168.100.102
+- name: "consul-03"
+  box: "slowe/ubuntu-trusty-x64"
+  ram: "512"
+  vcpu: "1"
+  priv_ip: 192.168.100.103