browbeat/ansible/browbeat/adjust-nova-allocation.yml

---
#
# Playbook to adjust Nova allocation ratios
#
# Versions tested: Newton, Ocata, Pike
#
# Newton, Ocata apply changes to the Controllers as Pike applies changes to the Computes
#
# Examples:
# ansible-playbook -i hosts browbeat/adjust-nova-allocation.yml -e "cpu_allocation_ratio=100.0"
# ansible-playbook -i hosts browbeat/adjust-nova-allocation.yml -e "cpu_allocation_ratio=100.0 ram_allocation_ratio=100.0"
# ansible-playbook -i hosts browbeat/adjust-nova-allocation.yml -e "cpu_allocation_ratio=100.0 ram_allocation_ratio=100.0 disk_allocation_ratio=100.0"
#
# In order for new settings to take affect, you need to restart the Nova services
# by adding variable restart_nova=true into the extra vars.
#
# ansible-playbook -i hosts browbeat/adjust-nova-allocation.yml -e "cpu_allocation_ratio=100.0 ram_allocation_ratio=100.0 disk_allocation_ratio=100.0 restart_nova=true"
#
# * Note not setting a variable does not change that configuration item then. Setting no variables
#   and running the playbook sets all configuration items to defaults (cpu/ram/disk - 16/1/1)
#
# ansible-playbook -i hosts browbeat/adjust-nova-allocation.yml
#

- hosts: controller,compute
  remote_user: "{{ host_remote_user }}"
  gather_facts: false
  vars_files:
    - ../install/group_vars/all.yml
  vars:
    restart_nova: false
    # Create initial blank configuration list
    nova_configuration: []
    # Defaults
    default_cpu_allocation_ratio: 16
    default_ram_allocation_ratio: 1
    default_disk_allocation_ratio: 1
    # Each configuration item needs to be a list so it can be merged
    cpu_allocation_ratio_item: []
    ram_allocation_ratio_item: []
    disk_allocation_ratio_item: []
  pre_tasks:
    - name: Get OSP Version
      slurp:
        src: "/etc/rhosp-release"
      register: osp_version
      become: true

    - name: (Newton, Ocata) Set Config File based on OpenStack Version
      set_fact:
        nova_config_file: /etc/nova/nova.conf
      when: "('Newton' in osp_version['content'] | b64decode or 'Ocata' in osp_version['content'] | b64decode)"

    - name: (Pike, Queens) Set Config File based on OpenStack Version
      set_fact:
        nova_config_file: /var/lib/config-data/puppet-generated/nova_libvirt/etc/nova/nova.conf
      when: "('Pike' in osp_version['content'] | b64decode or 'Queens' in osp_version['content'] | b64decode)"

    - name: Set default cpu_allocation_ratio/ram_allocation_ratio/disk_allocation_ratio configuration for Nova
      set_fact:
        nova_configuration:
          - section: DEFAULT
            option: cpu_allocation_ratio
            value: "{{default_cpu_allocation_ratio}}"
          - section: DEFAULT
            option: ram_allocation_ratio
            value: "{{default_ram_allocation_ratio}}"
          - section: DEFAULT
            option: disk_allocation_ratio
            value: "{{default_disk_allocation_ratio}}"
      when: cpu_allocation_ratio is undefined and ram_allocation_ratio is undefined and disk_allocation_ratio is undefined

    - name: Set cpu_allocation_ratio configuration for Nova
      set_fact:
        cpu_allocation_ratio_item:
          - section: DEFAULT
            option: cpu_allocation_ratio
            value: "{{cpu_allocation_ratio}}"
      when: cpu_allocation_ratio is defined

    - name: Set ram_allocation_ratio configuration for Nova
      set_fact:
        ram_allocation_ratio_item:
          - section: DEFAULT
            option: ram_allocation_ratio
            value: "{{ram_allocation_ratio}}"
      when: ram_allocation_ratio is defined

    - name: Set disk_allocation_ratio configuration for Nova
      set_fact:
        disk_allocation_ratio_item:
          - section: DEFAULT
            option: disk_allocation_ratio
            value: "{{disk_allocation_ratio}}"
      when: disk_allocation_ratio is defined

    - name: Merge configuration items
      set_fact:
        nova_configuration: "{{nova_configuration + cpu_allocation_ratio_item + ram_allocation_ratio_item + disk_allocation_ratio_item }}"

  roles:
    - nova-config

  post_tasks:

    - name: (Newton, Ocata) Restart Nova Services
      become: true
      service:
        name: "{{ item }}"
        state: restarted
      with_items:
        - openstack-nova-scheduler
        - openstack-nova-api
        - openstack-nova-conductor
        - openstack-nova-novncproxy
        - openstack-nova-consoleauth
        - httpd
      when:
        - "'Newton' in osp_version['content'] | b64decode or 'Ocata' in osp_version['content'] | b64decode"
        - "'controller' in group_names"
        - restart_nova

    - name: (Pike, Queens) Restart Nova Compute Container
      become: true
      command: docker restart nova_compute
      when:
        - "('Pike' in osp_version['content'] | b64decode or 'Queens' in osp_version['content'] | b64decode)"
        - "'compute' in group_names"
        - restart_nova