Template to create auto scaling group and load balancer at AWS

gistfile1.yml

mac: 0.7.1
description: Scaled and Load-Balanced Application
name: demo
version: '1.0'

roles:
  app:
    instance create:
      # application configuration defined at https://manageacloud.com/configuration/demo_application
      configuration: demo_application
      environment:
      - DB_IP: 127.0.0.1
      - APP_BRANCH: master

actions:
   # will be executed on the instances to fetch information
   get_id:
      ssh: wget -q -O - http://169.254.169.254/latest/meta-data/instance-id

   get_availability_zone:
      ssh: wget -q -O - http://169.254.169.254/latest/meta-data/placement/availability-zone

   get_security_groups:
      ssh: wget -q -O - http://169.254.169.254/latest/meta-data/security-groups

resources:
   # resources creates configurations in the cloud.

   # creates load balancer
   build_lb:
      create bash:
        aws elb create-load-balancer
          --load-balancer-name my-load-balancer
          --listeners Protocol=HTTP,LoadBalancerPort=80,InstanceProtocol=HTTP,InstancePort=80
          --region infrastructure.image_base_inf.location
          --availability-zones role.app.get_availability_zone

    # creates AMI from the role 'app'
   create_image:
      create bash:
          aws ec2 create-image
            --instance-id infrastructure.image_base_inf.get_id
            --name DemoApplication3
            --description MyDemoApplication
            --region infrastructure.image_base_inf.location

   create_launch_configuration:
      create bash:
          aws autoscaling create-launch-configuration
            --launch-configuration-name my-lc
            --image-id resource.create_image_inf.json.ImageId
            --instance-type infrastructure.image_base_inf.hardware
            --security-groups role.app.get_security_groups
            --region infrastructure.image_base_inf.location

   create_autoscale_group:
      create bash:
          aws autoscaling create-auto-scaling-group
            --auto-scaling-group-name my-lb-asg
            --launch-configuration-name my-lc
            --availability-zones role.app.get_availability_zone
            --load-balancer-names my-load-balancer
            --max-size 5
            --min-size 1
            --desired-capacity 2
            --region infrastructure.image_base_inf.location

infrastructures:  # infrastructures runs everything. The order is preserved.

  # create E2C instance using the configuration for role 'app'
  image_base_inf:
    name: app
    provider: amazon
    location: us-east-1
    hardware: t1.micro
    role: app
    amount: 1

  # create the load balancer
  build_lb_inf:
    resource: build_lb

  # create the AMI from the E2C instance created before
  create_image_inf:
    ready: role.app
    resource: create_image

  # create launch configuration
  create_launch_configuration_inf:
    resource: create_launch_configuration

  # create autoscale group
  create_autoscale_group_inf:
    resource: create_autoscale_group