heat_template_version: 2013-05-23  
description: A simple auto scaling group.  
parameters:
  flavor:
    type: string
    description: flavor used by the web servers
    default: m1.small
  network:
    type: string
    description: Network used by the server
    default: f6e1b574-21a1-44c6-9461-bdc0ef7a9b92
  subnet_id:
    type: string
    description: subnet on which the load balancer will be located
    default: 7cb2661a-aea1-47d8-909b-2096d6f193de
  external_network:
    type: string
    description: UUID of a Neutron external network
    default: 91ee6369-8f8d-497d-beca-1812518a6c30
  server_name:
    type: string
    description: name of my server
    default: Cassandra
  image:
    type: string
    description: Image used for servers
    default: cassandra_server
  key_name:
    type: string
    description: name of a keypair
    default: cassandra_freeradius
#  db_port:
#    type: string
#    description: port
resources:  

  group:
    type: OS::Heat::AutoScalingGroup
    properties:
      cooldown: 60
      desired_capacity: 1
      max_size: 5
      min_size: 1
      resource:
        type: OS::Heat::Stack
        properties:
          context: 
            region_name: nova
          parameters:
          template: {get_file: cassandra_envir.yaml}
  scaleup_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: { get_resource: group }
      cooldown: 60
      scaling_adjustment: 1

  cpu_alarm_high:
    type: OS::Ceilometer::Alarm
    properties:
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 50
      alarm_actions:
        - {get_attr: [scaleup_policy, alarm_url]}
      matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}}
      comparison_operator: gt

  scaledown_policy:
    type: OS::Heat::ScalingPolicy
    properties:
      adjustment_type: change_in_capacity
      auto_scaling_group_id: {get_resource: group}
      cooldown: 60
      scaling_adjustment: -1

  cpu_alarm_low:
    type: OS::Ceilometer::Alarm
    properties:
      description: Scale-down if the average CPU < 15% for 1 minutes
      meter_name: cpu_util
      statistic: avg
      period: 60
      evaluation_periods: 1
      threshold: 40
      alarm_actions:
        - {get_attr: [scaledown_policy, alarm_url]}
      matching_metadata: {'metadata.user_metadata.stack': {get_param: "OS::stack_id"}}
      comparison_operator: lt

  lb_vip_port:
    type: OS::Neutron::Port
    properties:
      network_id: { get_param: network }
      fixed_ips:
        - subnet_id: { get_param: subnet_id}

  lb_vip_floating_ip:
    type: OS::Neutron::FloatingIP
    properties:
      floating_network_id: {get_param: external_network}
      port_id: {get_resource: lb_vip_port}

  lb_pool_vip:
    type: OS::Neutron::FloatingIPAssociation
    properties:
      floatingip_id: { get_resource: lb_vip_floating_ip }
      port_id: { 'Fn::Select': ['port_id', {get_attr: [pool, vip]}]}

  monitor:
    type: OS::Neutron::HealthMonitor
    properties:
      type: TCP
      delay: 5
      max_retries: 5
      timeout: 5
  pool:
    type: OS::Neutron::Pool
    properties:
      protocol: TCP
      monitors: [{get_resource: monitor}]
      subnet_id: {get_param: subnet_id}
      lb_method: ROUND_ROBIN
      vip:
        protocol_port: 9042
  lb:
    type: OS::Neutron::LoadBalancer
    properties:
      protocol_port: 9042
      pool_id: {get_resource: pool}