autoscaling.yaml

heat_template_version: 2013-05-23
description: Load balance an autoScaling group
parameters:
  max_instances:
    type: number
    description: Maximum number of instances
    default : 5
  min_instances:
    type: number
    description: Minimum number of instances
    default : 1
  desired_capacity:
    type: number
    description: Desired initial number of resources
    default : 1

  OS_AUTH_URL:
    type: string
    description: OS authentication URL 
    default : NO OS_AUTH_URL
  image_cirros:
    type: string
    description: Image used for servers
    default: cirros-0.3.4-x86_64-disk
  image_ubuntu:
    type: string
    description: Image used for servers
    default: precise-server-cloudimg-amd64-disk1
  key:
    type: string
    description: SSH key to connect to the servers
    default: mykeypair
  flavor:
    type: string
    description: flavor used by the web servers
    default: m1.nano
  control_flavor:
    type: string
    description: flavor used by the db server
    default: m1.micro
  network:
    type: string
    description: Network used by the server
  subnet_id:
    type: string
    description: subnet on which the load balancer will be located
  external_network_id:
    type: string
    description: UUID of a Neutron external network

resources:

  controller:
    type: OS::Nova::Server
    properties:
      name: ctrlsrv      
      flavor: {get_param: control_flavor}
      image: {get_param: image_ubuntu}
      key_name: {get_param: key}
      networks: [{network: {get_param: network} }]
      user_data_format: RAW
      user_data:
        str_replace:
          template: |          
            #!/bin/sh
            #       install python requests
            echo "127.0.0.1 localhost ctrlsrv" >> /etc/hosts
            
            export LC_ALL=C            
            sudo curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py"
            sudo python get-pip.py
            sudo pip install virtualenv
            sudo pip install requests
            sudo apt-get -y install siege
            sudo apt-get -y install subversion
            sudo svn export https://github.com/arabnejad/Fuzzy-Q-Learning/trunk/FQL  /tmp/FQL

            cat << EOF > /tmp/FQL/config_param
            Neutron FloatingIP:
            $lb_floating
            OS authentication URL:
            $OS_AUTH_URL
            Webhook to scale up1 the group:
            $scale_up1_url
            Webhook to scale up2 the group:
            $scale_up2_url
            Webhook to scale down1 the group:
            $scale_down1_url
            Webhook to scale down2 the group:
            $scale_down2_url
            Maximum number of instances:
            $max_instances
            Minimum number of instances:
            $min_instances
            EOF


          params:
            $lb_floating:    {get_attr: [lb_floating, floating_ip_address]}
            $scale_up1_url:   {get_attr: [scaleup1_policy, alarm_url]}
            $scale_up2_url:   {get_attr: [scaleup2_policy, alarm_url]}
            $scale_down1_url: {get_attr: [scaledown1_policy, alarm_url]}
            $scale_down2_url: {get_attr: [scaledown2_policy, alarm_url]}
            $OS_AUTH_URL:    {get_param: OS_AUTH_URL}
            $max_instances:  {get_param: max_instances}
            $min_instances:  {get_param: min_instances}

# define autoscale group with minimum and maximum number of VMs
  asg:
    type: OS::Heat::AutoScalingGroup
    properties:
      desired_capacity: {get_param: desired_capacity}
      min_size: {get_param: min_instances}
      max_size: {get_param: max_instances}
      resource:
        type: lb_server.yaml
        properties:
          flavor: {get_param: flavor}
          image: {get_param: image_cirros}         
          key_name: {get_param: key}
          network: {get_param: network}
          pool_id: {get_resource: pool}
          metadata: {"metering.stack": {get_param: "OS::stack_id"}}
          user_data: |
            #!/bin/sh

            MYIP=$(ifconfig eth0|grep 'inet addr'|awk -F: '{print $2}'| awk '{print $1}')
            echo "<html>" > /tmp/index.html
            echo "name=$(hostname)  cirros VM image IP=$MYIP" >> /tmp/index.html
            echo "</html>" >> /tmp/index.html

            while true
            do
              { 
                echo "HTTP/1.0 200 OK"; 
                echo "Content-Length: $(wc -c /tmp/index.html | cut -d' ' -f1)";
                echo;
                cat /tmp/index.html;
              } | sudo nc -l -p 80;
              rnd=$(awk "BEGIN{print $(($(hexdump -n 2 -e '/2 "%u"' /dev/urandom)%100))/100}");
              sleep $rnd;
            done

  scaleup1_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: {get_resource: asg}
      cooldown: 10
      scaling_adjustment: 1
  scaleup2_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: {get_resource: asg}
      cooldown: 10
      scaling_adjustment: 2

  scaledown1_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: {get_resource: asg}
      cooldown: 10
      scaling_adjustment: -1
  scaledown2_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: {get_resource: asg}
      cooldown: 10
      scaling_adjustment: -2

  monitor:
    type: OS::Neutron::HealthMonitor
    properties:
      type: TCP
      delay: 1
      max_retries: 10
      timeout: 1
  pool:
    type: OS::Neutron::Pool
    properties:
      protocol: HTTP
      monitors: [{get_resource: monitor}]
      subnet_id: {get_param: subnet_id}
      lb_method: ROUND_ROBIN
      vip:
        protocol_port: 80
  lb:
    type: OS::Neutron::LoadBalancer
    properties:
      protocol_port: 80
      pool_id: {get_resource: pool}

  lb_floating:
    type: OS::Neutron::FloatingIP
    properties:
      floating_network_id: {get_param: external_network_id}
      port_id: {get_attr: [pool, vip, port_id]}



outputs:
  scale_up1_url:
    value: {get_attr: [scaleup1_policy, alarm_url]}
    description: Webhook to scale up the group, curl -XPOST -i 'scale_up1_url'
  scale_up2_url:
    value: {get_attr: [scaleup2_policy, alarm_url]}
    description: Webhook to scale up the group, curl -XPOST -i 'scale_up2_url'
  scale_down1_url:
    value: {get_attr: [scaledown1_policy, alarm_url]}
    description: Webhook to scale down the group, curl -XPOST -i 'scale_down1_url'
  scale_down2_url:
    value: {get_attr: [scaledown2_policy, alarm_url]}
    description: Webhook to scale down the group, curl -XPOST -i 'scale_down2_url'
  lbserver:
    value: {get_attr: [lb_floating, floating_ip_address]}
    description: Front-end web server, curl -XGET http://lbserver/
  OS_AUTH_URL:
    value: {get_param: OS_AUTH_URL}
    description: OS authentication URL
  desired_capacity:
    value: {get_param: desired_capacity}
    description: Desired initial number of resources