Ansible : Playbook を利用する (Roles)2022/09/27

Ansible の Roles 機能の利用例です。
Roles は Ansible であらかじめ定義された Playbook の命名規則・ファイル配置に従うことで、自動的にインクルードを実行する機能です。

具体的には以下のような構成 (左図) になります。
[playbook.yml], [role01] は任意の名前で OK ですが、それ以外は固定となります。
当例では、以下のような構成 (右図) の Roles 適用 Playbook を作成します。


+--- playbook.yml                  +--- playbook_sample.yml
|                                  |
+--- roles/                        +--- roles/
     |                                  |
     +--- role01/                       +--- ins_mariadb/
          |                             |    |
          +--- files/                   |    +--- vars/
          |                             |    |    |
          +--- templates/               |    |    +--- main.yml
          |                             |    +--- tasks/
          +--- tasks/                   |         |
          |                             |         +--- main.yml
          +--- handlers/                |
          |                             +--- ins_nginx/
          +--- vars/                              |
          |                                       +--- files/
          +--- defaults/                          |    |
          |                                       |    +--- index.html
          +--- meta/                              +--- vars/
                                                  |    |
                                                  |    +--- main.yml
                                                  |
                                                  +--- tasks/
                                                       |
                                                       +--- main.yml

[1]	Nginx と MariaDB をインストールして起動する Roles 適用 Playbook です。

ubuntu@dlp:~$

mkdir -p roles/ins_mariadb/{tasks,vars}

ubuntu@dlp:~$

mkdir -p roles/ins_nginx/{files,tasks,vars}

ubuntu@dlp:~$

vi playbook_sample.yml

- hosts: target_servers
  become: yes
  become_method: sudo
  roles:
    - ins_mariadb
    - ins_nginx

ubuntu@dlp:~$

vi roles/ins_mariadb/vars/main.yml

mariadb_package:
  - mariadb-server
  - python3-pymysql

ubuntu@dlp:~$

vi roles/ins_mariadb/tasks/main.yml

- name: mariadb is installed
  apt:
    name: "{{ mariadb_package }}"
    state: present
  tags: install_mariadb

- name: mariadb is running and enabled
  service:
    name: mariadb
    state: started
    enabled: yes

ubuntu@dlp:~$

vi roles/ins_nginx/vars/main.yml

nginx_package:
  - nginx

ubuntu@dlp:~$

vi roles/ins_nginx/tasks/main.yml

- name: nginx is installed
  apt:
    name: "{{ nginx_package }}"
    state: present
  tags: install_nginx

- name: edit nginx.default
  lineinfile:
    path: /etc/nginx/sites-available/default
    regexp: "server_name _;"
    line: "server_name {{ ansible_fqdn }};"
  tags: edit_nginx.default

- name: nginx is running and enabled
  service:
    name: nginx
    state: started
    enabled: yes

- name: put index.html
  copy:
    src: index.html
    dest: /var/www/html
    owner: root
    group: root
    mode: 0644

- name: check nginx
  uri:
    url: http://{{ ansible_fqdn }}

ubuntu@dlp:~$

echo "nginx index page" > roles/ins_nginx/files/index.html

ubuntu@dlp:~$

ansible-playbook playbook_sample.yml --ask-become-pass

BECOME password:

PLAY [target_servers] **********************************************************

TASK [Gathering Facts] *********************************************************
ok: [10.0.0.51]
ok: [10.0.0.52]

TASK [ins_mariadb : mariadb is installed] **************************************
ok: [10.0.0.51]
ok: [10.0.0.52]

TASK [ins_mariadb : mariadb is running and enabled] ****************************
ok: [10.0.0.52]
ok: [10.0.0.51]

TASK [ins_nginx : nginx is installed] ******************************************
ok: [10.0.0.51]
ok: [10.0.0.52]

TASK [ins_nginx : edit nginx.default] ******************************************
changed: [10.0.0.52]
changed: [10.0.0.51]

TASK [ins_nginx : nginx is running and enabled] ********************************
changed: [10.0.0.51]
changed: [10.0.0.52]

TASK [ins_nginx : put index.html] **********************************************
changed: [10.0.0.52]
changed: [10.0.0.51]

TASK [ins_nginx : check nginx] *************************************************
ok: [10.0.0.52]
ok: [10.0.0.51]

PLAY RECAP *********************************************************************
10.0.0.51                  : ok=8    changed=3    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
10.0.0.52                  : ok=8    changed=3    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0