kolla-ansible/ansible/roles/neutron/tasks/precheck.yml

---
- name: Get container facts
  kolla_container_facts:
    name:
      - neutron_server
  register: container_facts

- name: Checking free port for Neutron Server
  wait_for:
    host: "{{ api_interface_address }}"
    port: "{{ neutron_server_port }}"
    connect_timeout: 1
    timeout: 1
    state: stopped
  when:
    - container_facts['neutron_server'] is not defined
    - inventory_hostname in groups['neutron-server']

- name: Checking number of network agents
  local_action: fail msg="Number of network agents are less than two when enabling agent ha"
  changed_when: false
  when:
    - enable_neutron_agent_ha | bool
    - groups['neutron-dhcp-agent'] | length < 2
      or groups['neutron-l3-agent'] | length < 2

# When MountFlags is set to shared, a signal bit configured on 20th bit of a number
# We need to check the 20th bit. 2^20 = 1048576. So we are validating against it.
- name: Checking if 'MountFlags' for docker service is set to 'shared'
  command: systemctl show docker
  register: result
  changed_when: false
  failed_when: result.stdout.find('MountFlags=1048576') == -1
  when:
    - (inventory_hostname in groups['neutron-dhcp-agent']
       or inventory_hostname in groups['neutron-l3-agent']
       or inventory_hostname in groups['neutron-metadata-agent'])
    - ansible_os_family == 'RedHat' or ansible_distribution == 'Ubuntu'