multi-instance.yml

#cloud-config
heat_template_version: 2021-04-16

description: >
  Set up multiple instances of a particular image on Nectar.

parameters:

  server_count:
    type: number
    default: 3

  password:
    type: string
    description: Password to set for the default user

  key_name:
    type: string
    label: Key Name
    description: Name of an existing KeyPair to enable SSH access to the instances.

  flavor:
    type: string
    description: The NeCTAR flavour the webserver is to run on
    default: m3.small

  image:
    type: string
    description: ID or name of the image to use for the instance to be created (should work with all NeCTAR images)
    default: NeCTAR Ubuntu 24.04 LTS (Noble) amd64

  availability_zone:
    type: string
    description: Availability Zone
    default: monash-02


resources:

  security_group:
    # https://docs.openstack.org/heat/latest/template_guide/openstack.html#OS::Neutron::SecurityGroup
    type: OS::Neutron::SecurityGroup
    properties:
      rules:
        - remote_ip_prefix: 0.0.0.0/0
          protocol: icmp
        - remote_ip_prefix: 0.0.0.0/0
          protocol: tcp
          port_range_min: 22
          port_range_max: 22
        - remote_ip_prefix: 0.0.0.0/0
          protocol: tcp
          port_range_min: 80
          port_range_max: 80

  cloud_config:
    # http://docs.openstack.org/developer/heat/template_guide/openstack.html#OS::Heat::CloudConfig
    type: OS::Heat::CloudConfig
    properties:
      cloud_config:

        package_update: true
        package_upgrade: true

        user: user
        password: { get_param: password }
        ssh_pwauth: true
        lock_passwd: false
        chpasswd: {expire: False}
        
        packages:
          - software-properties-common
          - apt-transport-https
          - ca-certificates

        runcmd:
          - echo "setting up instance"

        final_message: "The system is now configured"

  cloud_init_user_data:
    # http://docs.openstack.org/developer/heat/template_guide/openstack.html#OS::Heat::MultipartMime
    type: OS::Heat::MultipartMime
    properties:
      parts:
      - config: { get_resource: cloud_config }

  server_group:
    type: OS::Heat::ResourceGroup
    properties:
      count: { get_param: server_count }
      resource_def:
        # http://docs.openstack.org/developer/heat/template_guide/openstack.html#OS::Nova::Server
        type: OS::Nova::Server
        properties:
          name:
            str_replace:
              template: workshop-%index%
              params:
                "%index%": "%index%"
          key_name: { get_param: key_name }
          image: { get_param: image }
          flavor: { get_param: flavor }
          availability_zone: { get_param: availability_zone }
          security_groups:
          - { get_resource: security_group }
          networks:
            - allocate_network: auto
          user_data_format: RAW
          user_data:
            get_resource: cloud_init_user_data