April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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132
7 章 複雑な Playbook
7.2
ホスト以外のマシン上でのタスクの実行
1
つのホストに関連づけられているタスクを、別のサーバーで実行したいこともあります。タス
クを別のサーバーで実行させたい場合は、
delegate_to
節が使えます。
一般的なユースケースを
2
つ紹介しましょう。
• Nagios
のようなアラートシステムで、ホストベースのアラートを有効化する
• HAProxy
のようなロードバランサにホストを追加する。
例えば、
web
グループに属する全ホストに対して、
Nagios
のアラートを有効化したいとしましょ
う。インベントリに、
Nagios
を動作させる
nagios.example.com
という名前のエントリがあるとし
ましょう。例
7-1
は、
delegate_to
の使用例です。
例
7-1
Nagios
での
delegate_to
の利用
- name: enable alerts for web servers
hosts: web
tasks:
- name: enable alerts
nagios: action=enable_alerts service=web host={{ inventory_hostname }}
delegate_to: nagios.example.com
この例では、
Ansible
は
nagios
タスクを
nagios.example.com
上で実行しますが、
play
中の変数
inventory_hostname
の評価の結果は
Web
のホストになります。 ...
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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.