openstack-ansible-ops/elk_metrics_6x/roles/elastic_dependencies/tasks/main.yml

---
# Copyright 2018, 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: Check for service_name var
  fail:
    msg: >-
      The required variable [ service_name ] is undefined.      
  when:
    - service_name is undefined

- name: Check for service_owner var
  fail:
    msg: >-
      The required variable [ service_owner ] is undefined.      
  when:
    - service_owner is undefined

- name: Check for service_group var
  fail:
    msg: >-
      The required variable [ service_group ] is undefined.      
  when:
    - service_group is undefined

- name: Load service variables
  include_vars: "vars_{{ service_name }}.yml"

- name: Gather variables for each operating system
  include_vars: "{{ item }}"
  with_first_found:
    - "{{ ansible_distribution | lower }}-{{ ansible_distribution_version | lower }}.yml"
    - "{{ ansible_distribution | lower }}-{{ ansible_distribution_major_version | lower }}.yml"
    - "{{ ansible_os_family | lower }}-{{ ansible_distribution_major_version | lower }}.yml"
    - "{{ ansible_distribution | lower }}.yml"
    - "{{ ansible_os_family | lower }}-{{ ansible_distribution_version.split('.')[0] }}.yml"
    - "{{ ansible_os_family | lower }}.yml"
  tags:
    - always

- name: Set elastic heap defaults
  set_fact:
    elastic_heap_size_default: "{{ _elastic_heap_size_default }}"
    elastic_log_rotate_path: "/var/log/{{ service_name }}"

- name: Configure systcl vm.max_map_count=524288 on elastic hosts
  sysctl:
    name: "vm.max_map_count"
    value: "524288"
    state: "present"
    reload: "yes"
    sysctl_file: /etc/sysctl.d/99-elasticsearch.conf
  delegate_to: "{{ physical_host }}"
  tags:
    - sysctl

- name: Configure systcl fs.inotify.max_user_watches=1048576 on elastic hosts
  sysctl:
    name: "fs.inotify.max_user_watches"
    value: "1048576"
    state: "present"
    reload: "yes"
    sysctl_file: /etc/sysctl.d/99-elasticsearch.conf
  delegate_to: "{{ physical_host }}"
  tags:
    - sysctl

- name: Create the system group
  group:
    name: "{{ service_group }}"
    gid: "{{ service_group_gid | default(omit) }}"
    state: "present"
    system: "yes"

- name: Create the system user
  block:
    - name: Create the system user
      user:
        name: "{{ service_owner }}"
        uid: "{{ service_owner_uid | default(omit) }}"
        group: "{{ service_group }}"
        shell: "/bin/false"
        system: "yes"
        createhome: "no"
        home: "/var/lib/{{ service_name }}"
  rescue:
    - name: Check for system user
      debug:
        msg: >-
          The general user creation task failed. This typically means that the
          user already exists and something in the user configuration provided
          is changing the system user in way that is simply not possible at this
          time. The playbooks will now simply ensure the user exists and before
          carrying on to the next task. While it's not required, it may be
          benificial to schedule a maintenance where the elastic services are
          stopped.          

    - name: Ensure the system user exists
      user:
        name: "{{ service_owner }}"
        group: "{{ service_group }}"

- name: Physical host block
  block:
    - name: Check for directory
      stat:
        path: "/var/lib/{{ service_name }}"
      register: service_dir

    - name: Check for data directory
      debug:
        msg: >-
          The service data directory [ /var/lib/{{ service_name }} ] already
          exists. To ensure no data is lost, the linked directory path to
          [ /openstack/{{ inventory_hostname }}/{{ service_name }} ] will not be
          created for this host.          
      when:
        - service_dir.stat.isdir is defined and
          service_dir.stat.isdir

    - name: Ensure service directories data-path exists
      file:
        path: "/openstack/{{ inventory_hostname }}/{{ service_name }}"
        state: "directory"
        owner: "{{ service_owner }}"
        group: "{{ service_group }}"
      when:
        - not (service_dir.stat.exists | bool)

    - name: Ensure data link exists
      file:
        src: "/openstack/{{ inventory_hostname }}/{{ service_name }}"
        dest: "/var/lib/{{ service_name }}"
        owner: "{{ service_owner }}"
        group: "{{ service_group }}"
        state: link
      when:
        - not (service_dir.stat.exists | bool)
  when:
    - physical_host == inventory_hostname

- name: Container block
  block:
    - name: Ensure service directories data-path exists
      file:
        path: "/openstack/{{ inventory_hostname }}/{{ service_name }}"
        state: "directory"
      delegate_to: "{{ physical_host }}"

    - name: Pull lxc version
      command: "lxc-ls --version"
      delegate_to: "{{ physical_host }}"
      changed_when: false
      register: lxc_version
      tags:
        - skip_ansible_lint

    - name: Enable or Disable lxc three syntax
      set_fact:
        lxc_major_version: "{{ lxc_version.stdout.split('.')[0] }}"

    - name: elasticsearch datapath bind mount
      lxc_container:
        name: "{{ inventory_hostname }}"
        container_command: |
          [[ ! -d "/var/lib/{{ service_name }}" ]] && mkdir -p "/var/lib/{{ service_name }}"          
        container_config:
          - "{{ elastic_lxc_template_config[(lxc_major_version | int)]['mount'] }}=/openstack/{{ inventory_hostname }}/{{ service_name }} var/lib/{{ service_name }} none bind 0 0"
          - "{{ elastic_lxc_template_config[(lxc_major_version | int)]['aa_profile'] }}=unconfined"
      delegate_to: "{{ physical_host }}"
  when:
    - container_tech | default('lxc') == 'lxc'
    - physical_host != inventory_hostname

- name: Ensure Java is installed
  package:
    name: "{{ elastic_distro_packages }}"
    state: "{{ elk_package_state | default('present') }}"
    install_recommends: "{{ (ansible_pkg_mgr == 'apt') | ternary('yes', omit) }}"
    update_cache: "{{ (ansible_pkg_mgr == 'apt') | ternary('yes', omit) }}"
  register: _package_task
  until: _package_task is success
  retries: 3
  delay: 2
  tags:
    - package_install

- name: Ensure service directories exists
  file:
    path: "/etc/{{ service_name }}"
    state: "directory"
    owner: "{{ service_owner }}"
    group: "{{ service_group }}"

- name: Drop logrotate conf file(s)
  template:
    src: "{{ item.src }}"
    dest: "{{ item.dest }}"
  with_items:
    - src: "templates/logrotate.j2"
      dest: "/etc/logrotate.d/{{ service_name }}"

- name: Ensure host can resolve itself
  lineinfile:
    path: /etc/hosts
    regexp: '^{{ item }}'
    line: '{{ item }} {{ ansible_hostname }} {{ ansible_fqdn }}'
    owner: root
    group: root
    mode: 0644
  with_items:
    - "127.0.2.1"
    - "{{ ansible_host }}"