Chapter 15

条件 : when

y_mrok

2021.10.24に更新

このチャプターの目次

説明
演習問題

説明

この章の説明はこのリンクをクリックしてください。

演習問題

Q1. web グループに含まれる管理対象ノードの OS やバージョンを考慮して Apache をインストールするプレイブックを作成してください。

OS ファミリー、バージョン、使用するモジュール、インストールするパッケージの組み合わせ

OS ファミリーバージョンモジュールパッケージ

RedHat 7 ansible.builtin.yum httpd

RedHat 8 ansible.builtin.dnf httpd

Debian - ansible.builtin.apt apache2
すべてのタスクは管理権限が必要です。
OS ファミリーは「変数の参照方法」の「演習問題」を参照してください。
OS のメジャーバージョンは「ファクト変数」の「演習問題 Q4 」を参照してください。

OS ファミリー	バージョン	モジュール	パッケージ
RedHat	7	ansible.builtin.yum	httpd
RedHat	8	ansible.builtin.dnf	httpd
Debian	-	ansible.builtin.apt	apache2

Apache をインストール後、サービスの起動が必要です。サービスを起動するタスクです ( OS ファミリーなどの判断は含まれていません ) 。

RedHat 系

- name: Start httpd service.
  ansible.builtin.systemd:
    name: httpd.service
    state: started

Debian 系

- name: Start apache2 service.
  ansible.builtin.systemd:
    name: apache2.service
    state: started

インベントリーファイルの内容

hosts.yml

 ---
 all:
   children:
     web:
       hosts:
         marutamachi: # CentOS/8.3 (RedHat)
         takeyamachi: # CentOS/7.8 (RedHat)
         oshikoji:    # Debian10 (Debian)
     mail:
       hosts:
         nijyo:
         ebisugawa:
     database:
       hosts:
         oshikoji:
         oike:

group_vars/

---
ansible_user: vagrant
ansible_password: vagrant

group_vars/web.yml

---
http_port: 8080

host_vars/marutamachi.yml

---
ansible_host: 192.168.111.101

host_vars/takeyamachi.yml

---
ansible_host: 192.168.111.102

host_vars/ebisugawa.yml

---
ansible_host: 192.168.111.103

host_vars/nijyo.yml

---
ansible_host: 192.168.111.104

host_vars/oshikoji.yml

---
ansible_host: 192.168.111.105
ansible_python_interpreter: /usr/bin/python3

host_vars/oike.yml

---
ansible_host: 192.168.111.106
ansible_python_interpreter: /usr/libexec/platform-python

解答

install_apache.yml

---
- name: Identify the OS and install Apache.
  hosts: all
  become: yes

  tasks:
    - name: RedHat family with major version 7.
      ansible.builtin.yum:
        name: httpd
        state: present
      when:
        - inventory_hostname in groups['web']
        - ansible_facts['os_family'] == "RedHat"
        - ansible_facts['distribution_major_version'] == "7"
    - name: RedHat family with major version 8.
      ansible.builtin.dnf:
        name: httpd
        state: present
      when:
        - inventory_hostname in groups['web']
        - ansible_facts['os_family'] == "RedHat"
        - ansible_facts['distribution_major_version'] == "8"
    - name: Start httpd service.
      ansible.builtin.systemd:
        name: httpd.service
        state: started
      when:
        - inventory_hostname in groups['web']
        - ansible_facts['os_family'] == "RedHat"
    - name: Debian family.
      ansible.builtin.apt:
        name: apache2
        state: present
      when:
        - inventory_hostname in groups['web']
        - ansible_facts['os_family'] == "Debian"
    - name: Start apache2 service.
      ansible.builtin.systemd:
        name: apache2.service
        state: started
      when:
        - inventory_hostname in groups['web']
        - ansible_facts['os_family'] == "Debian"

y_mrok@ctrl:~/code/chap15$ ansible-playbook -i hosts.yml install_apache.yml 

PLAY [Identify the OS and install Apache.] ***********************************************************************************************************

TASK [Gathering Facts] *******************************************************************************************************************************
ok: [oshikoji]
ok: [takeyamachi]
ok: [marutamachi]
ok: [nijyo]
ok: [ebisugawa]
ok: [oike]

TASK [RedHat family with major version 7.] ***********************************************************************************************************
skipping: [marutamachi]
skipping: [oshikoji]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
changed: [takeyamachi]

TASK [RedHat family with major version 8.] ***********************************************************************************************************
skipping: [takeyamachi]
skipping: [oshikoji]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
changed: [marutamachi]

TASK [Start httpd service.] **************************************************************************************************************************
skipping: [oshikoji]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
changed: [takeyamachi]
changed: [marutamachi]

TASK [Debian family.] ********************************************************************************************************************************
skipping: [marutamachi]
skipping: [takeyamachi]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
changed: [oshikoji]

TASK [Start apache2 service.] ************************************************************************************************************************
skipping: [marutamachi]
skipping: [takeyamachi]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
ok: [oshikoji]

PLAY RECAP *******************************************************************************************************************************************
ebisugawa                  : ok=1    changed=0    unreachable=0    failed=0    skipped=5    rescued=0    ignored=0   
marutamachi                : ok=3    changed=2    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0   
nijyo                      : ok=1    changed=0    unreachable=0    failed=0    skipped=5    rescued=0    ignored=0   
oike                       : ok=1    changed=0    unreachable=0    failed=0    skipped=5    rescued=0    ignored=0   
oshikoji                   : ok=3    changed=1    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0   
takeyamachi                : ok=3    changed=2    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0   

y_mrok@ctrl:~/code/chap15$

冪等性を確認

y_mrok@ctrl:~/code/chap15$ ansible-playbook -i hosts.yml install_apache.yml 

PLAY [Identify the OS and install Apache.] ***********************************************************************************************************

TASK [Gathering Facts] *******************************************************************************************************************************
ok: [takeyamachi]
ok: [oshikoji]
ok: [marutamachi]
ok: [nijyo]
ok: [ebisugawa]
ok: [oike]

TASK [RedHat family with major version 7.] ***********************************************************************************************************
skipping: [marutamachi]
skipping: [oshikoji]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
ok: [takeyamachi]

TASK [RedHat family with major version 8.] ***********************************************************************************************************
skipping: [oshikoji]
skipping: [takeyamachi]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
ok: [marutamachi]

TASK [Start httpd service.] **************************************************************************************************************************
skipping: [oshikoji]
skipping: [ebisugawa]
skipping: [oike]
skipping: [nijyo]
ok: [takeyamachi]
ok: [marutamachi]

TASK [Debian family.] ********************************************************************************************************************************
skipping: [marutamachi]
skipping: [takeyamachi]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
ok: [oshikoji]

TASK [Start apache2 service.] ************************************************************************************************************************
skipping: [marutamachi]
skipping: [takeyamachi]
skipping: [nijyo]
skipping: [ebisugawa]
skipping: [oike]
ok: [oshikoji]

PLAY RECAP *******************************************************************************************************************************************
ebisugawa                  : ok=1    changed=0    unreachable=0    failed=0    skipped=5    rescued=0    ignored=0   
marutamachi                : ok=3    changed=0    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0   
nijyo                      : ok=1    changed=0    unreachable=0    failed=0    skipped=5    rescued=0    ignored=0   
oike                       : ok=1    changed=0    unreachable=0    failed=0    skipped=5    rescued=0    ignored=0   
oshikoji                   : ok=3    changed=0    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0   
takeyamachi                : ok=3    changed=0    unreachable=0    failed=0    skipped=3    rescued=0    ignored=0   

y_mrok@ctrl:~/code/chap15$

Q2. Apache のテストページを表示してください。

http://IPアドレス/

解答

管理対象ノード : marutamachi

http://192.168.111.101/

管理対象ノード : takeyamachi

http://192.168.111.102/

管理対象ノード : oshikoji

http://192.168.111.105/