flex_easy_server.yaml

heat_template_version: 2021-04-16

description: >
  Basic OpenStack environment with a private network, router, security group, and instance(s).

parameters:
  public_net:
    type: string
    default: PUBLICNET
    description: The pre-existing public network for external access.
  image:
    type: string
    description: The OS for the instance. ie Ubuntu-24.04.
  flavor:
    type: string
    description: The flavor to use for instances. ie gp.0.2.2.
  instance_count:
    type: number
    default: 1
    description: Number of instances to create.
  key_name:
    type: string
    description: Name of an existing SSH keypair to use for instances.

resources:
  private_net:
    type: OS::Neutron::Net
    properties:
      name: private_net

  private_subnet:
    type: OS::Neutron::Subnet
    properties:
      name: private_subnet
      network_id: { get_resource: private_net }
      cidr: 192.168.1.0/24
      gateway_ip: 192.168.1.1
      dns_nameservers:
        - 8.8.8.8
        - 8.8.4.4

  router:
    type: OS::Neutron::Router
    properties:
      external_gateway_info:
        network: { get_param: public_net }

  router_interface:
    type: OS::Neutron::RouterInterface
    properties:
      router_id: { get_resource: router }
      subnet_id: { get_resource: private_subnet }

  security_group:
    type: OS::Neutron::SecurityGroup
    properties:
      name: default_security_group
      rules:
        - protocol: icmp
        - protocol: tcp
          port_range_min: 22
          port_range_max: 22

  instances:
    type: OS::Heat::ResourceGroup
    properties:
      count: { get_param: instance_count }
      resource_def:
        type: OS::Nova::Server
        properties:
          name: instance-%index%
          image: { get_param: image }
          flavor: { get_param: flavor }
          key_name: { get_param: key_name }
          networks:
            - network: { get_resource: private_net }
          security_groups:
            - { get_resource: security_group }

  floating_ip:
    type: OS::Neutron::FloatingIP
    properties:
      floating_network: { get_param: public_net }

  floating_ip_association:
    type: OS::Neutron::FloatingIPAssociation
    properties:
      floatingip_id: { get_resource: floating_ip }
      port_id:
        get_attr: [instances, resource.0, addresses, private_net, 0, port]  

outputs:
  instance_ips:
    description: The private IPs of the instances.
    value: { get_attr: [instances, resource.0, addresses, private_net, 0, addr] }
  floating_ip:
    description: The floating IP assigned to the first instance.
    value: { get_attr: [floating_ip, floating_ip_address] }