openstack-ansible/playbooks/common-playbooks/nova.yml

---
# Copyright 2014, Rackspace US, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

- name: Gather nova facts
  hosts: "{{ nova_hosts }}"
  gather_facts: false
  tags:
    - always
  tasks:
    - name: Gather minimal facts for nova
      setup:
        gather_subset:
          - "!all"
          - min
      when: osa_gather_facts | default(True)

    - name: Gather additional facts for nova
      setup:
        gather_subset: "{{ nova_gather_subset | default('processor_count') }}"
        filter: "{{ nova_gather_filter | default('ansible_processor*') }}"
      when: osa_gather_facts | default(True)

- name: Install nova services
  hosts: "{{ nova_hosts }}"
  serial: "{{ nova_serial }}"
  gather_facts: false
  user: root
  environment: "{{ deployment_environment_variables | default({}) }}"
  vars_files:
    - "../defaults/repo_packages/openstack_services.yml"
    - "../defaults/repo_packages/nova_consoles.yml"
    - "../defaults/{{ install_method }}_install.yml"
  tags:
    - nova
  pre_tasks:
    # Enable execution of ceph_client on the nova compute hosts if cinder RBD
    # backends are used. This is necessary to ensure that volume-backed Nova
    # instances can function when RBD is the volume backend.
    - name: Set cinder RBD inuse fact
      set_fact:
        nova_cinder_rbd_inuse: "{{ True in groups['cinder_volume'] | map('extract', hostvars, 'cinder_backend_rbd_inuse') }}"
      delegate_to: localhost
      delegate_facts: True
      when:
        - "'nova_compute' in group_names"
        - "inventory_hostname == ((groups['nova_compute'] | intersect(ansible_play_hosts)) | list)[0]"
        - "hostvars['localhost']['nova_cinder_rbd_inuse'] is not defined"
      tags:
        - always

    # In order to ensure that any container, software or
    # config file changes which causes a container/service
    # restart do not cause an unexpected outage, we drain
    # the load balancer back end for this container.
    - include_tasks: ../common-tasks/haproxy-endpoint-manage.yml
      vars:
        haproxy_backend: "{{ backend_name }}-back"
        haproxy_state: disabled
      loop_control:
        loop_var: backend_name
      when:
        - "backend_name in group_names"
        - "groups[backend_name] | length > 1"
      with_items:
        - "nova_api_metadata"
        - "nova_api_os_compute"
        - "nova_console"

    - name: Determine management bridge IP address
      include_tasks: ../common-tasks/dynamic-address-fact.yml
      vars:
        network_address: "container_address"
      tags:
        - always

    - name: Configure container
      include_tasks: "../common-tasks/os-{{ container_tech | default('lxc') }}-container-setup.yml"
      when: not is_metal
      vars:
        extra_container_config_no_restart:
          - "lxc.start.order=39"

    - include_tasks: ../common-tasks/unbound-clients.yml
      when:
        - hostvars['localhost']['resolvconf_enabled'] | bool

    - name: Add nbd devices to the compute
      shell: |
        for i in /dev/nbd*;do
          lxc-device -n {{ container_name }} add $i $i
        done        
      failed_when: false
      register: device_add
      changed_when: >
        'added' in device_add.stdout.lower()        
      delegate_to: "{{ physical_host }}"
      when:
        - container_tech | default('lxc') == 'lxc'
        - "'nova_compute' in group_names"
        - "not is_metal | bool"
      tags:
        - always

    - name: Add net/tun device to the compute
      command: |
        lxc-device -n {{ container_name }} add /dev/net/tun /dev/net/tun        
      delegate_to: "{{ physical_host }}"
      when:
        - container_tech | default('lxc') == 'lxc'
        - "'nova_compute' in group_names"
        - "not is_metal | bool"
      tags:
        - always

    - name: Check if kvm device exists
      stat:
        path: /dev/kvm
      delegate_to: "{{ physical_host }}"
      register: kvm_device
      when:
        - container_tech | default('lxc') == 'lxc'
        - "'nova_compute' in group_names"
        - "not is_metal | bool"
      tags:
        - always

    - name: Add kvm device to the compute
      command: |
        lxc-device -n {{ container_name }} add /dev/kvm /dev/kvm        
      delegate_to: "{{ physical_host }}"
      register: device_add
      failed_when: false
      changed_when: >
        'added' in device_add.stdout.lower()        
      when:
        - container_tech | default('lxc') == 'lxc'
        - "'nova_compute' in group_names"
        - "not is_metal | bool"
        - "'ischr' in kvm_device.stat and kvm_device.stat.ischr | bool"
      tags:
        - always

  roles:
    - role: "os_nova"
      nova_management_address: "{{ container_address }}"
      nova_cinder_rbd_inuse: "{{ hostvars['localhost']['nova_cinder_rbd_inuse'] | default(False) }}"

    - role: "system_crontab_coordination"
      tags:
        - crontab

  post_tasks:
    # Now that container changes are done, we can set
    # the load balancer back end for this container
    # to available again.
    - include_tasks: ../common-tasks/haproxy-endpoint-manage.yml
      vars:
        haproxy_backend: "{{ backend_name }}-back"
        haproxy_state: enabled
      loop_control:
        loop_var: backend_name
      when:
        - "backend_name in group_names"
        - "groups[backend_name] | length > 1"
      with_items:
        - "nova_api_metadata"
        - "nova_api_os_compute"
        - "nova_console"