April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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3.9 add_host と group_by による実行時のエントリの追加
モジュールによってホストが追加されるのは、playbook の実行の間だけです。インベ
ントリファイルが変更されることはありません。
筆者は、
playbook
内でプロビジョニングを行う場合、処理を
2
つの
play
に分けるのが好みで
す。
1
つめの
play
は
localhost
に対して動作してホストのプロビジョニングを行い、
2
つめの
play
でそのホストを設定します。
このタスクでは、
creates=Vagrantfile
パラメータを使ったことに注意してください。
- name: create a Vagrantfile
command: vagrant init {{ box }} creates=Vagrantfile
こうすることで、
Ansible
に対し、
Vagrantfile
があればホストはすでに正しい状態にあり、コ
マンドを再度実行しなくてもよいということを指示しています。これは、（潜在的に冪等性を持た
ない）コマンドの実行を一度限りにすることで、コマンドモジュールを呼び出す
playbook
に冪等
性を持たせる方法の
1
つです。
3.9.2
group_by
Ansible
では、
playbook
の実行中に
group_by
モジュールを使って新しいグループを作ること
もできます。こうすることで、ファクト
†
と呼ばれる各ホストに設定された変数の値に基づいてグ
ループを作成できます。
ファクトの収集が有効になっている場合、 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.