create_headnode.yml

---
- hosts: localhost
  gather_facts: false
  vars_files:
    - vars/main.yml

  tasks: 
    - name: Create cluster private network
      os_network: 
        name: "{{ cluster_network_name }}"
        state: present

    - name: Create subnet for cluster network
      os_subnet:
        name: "{{ cluster_network_name }}"
        network_name: "{{ cluster_network_name }}"
        cidr: "{{ cluster_network_cidr }}"
        allocation_pool_start: "{{ cluster_network_allocation_pool_start }}"     
        allocation_pool_end: "{{ cluster_network_allocation_pool_end }}"
        dns_nameservers: "{{ cluster_network_dns_servers }}"
        state: present

    - name: Create a router to connect cluster network to internet
      os_router: 
        name: "{{ cluster_network_router }}"
        admin_state_up: true
        network: "public" 
        interfaces:
          - "{{ cluster_network_name }}"
        state: present 

    - name: Create security group for the cluster
      openstack.cloud.security_group:
        name: "{{ cluster_security_group }}"
        description: "Security Group for {{ cluster_name }}"
        state: present

    - name: Add security group access rule to allow ssh 
      openstack.cloud.security_group_rule:
        security_group: "{{ cluster_security_group }}"
        port_range_min: 22
        port_range_max: 22
        protocol: tcp
        remote_ip_prefix: "{{ cluster_network_ssh_access }}"
        state: present

    - name: Add security group access rule to allow access within group
      openstack.cloud.security_group_rule:
        security_group: "{{ cluster_security_group }}"
        protocol: any
        remote_group: "{{ cluster_security_group }}"
        state: present

    - name: Add ssh keypair
      os_keypair:
        name: "{{ keypair_name }}"
        public_key_file: "{{ ssh_public_keyfile }}"
        state: present

    - name: Create boot volume for head node
      os_volume:
        name: "{{ head_node_volume }}"
        image: "{{ image_name }}"
        bootable: true
        size: "{{ head_node_disk_size_gb }}"
        state: present

    - name: Launch cluster head node instance
      os_server:
        name: "{{ head_node_name }}"
        boot_volume: "{{ head_node_volume }}"
        flavor: "{{ head_node_flavor }}"
        key_name: "{{ keypair_name }}"
        network: "{{ cluster_network_name }}"
        auto_ip: true
        security_groups: "{{ cluster_security_group }}"
        state: present

    - name: Add head node to inventory
      import_tasks: tasks/add_headnode_inventory.yml

    - debug:
        msg: "{{ cluster_name }} head node is launched at {{ hostvars['localhost'].headnode.openstack_servers[0].accessIPv4 }}"


- hosts: headnode
  gather_facts: false
  vars_files:
    - ./vars/main.yml

  tasks:
    - name: wait for head node to boot and become reachable
      wait_for_connection:

    - debug:
        msg: "{{ cluster_name }} head node is up at {{ hostvars['localhost'].headnode.openstack_servers[0].accessIPv4 }}."