April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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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.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.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.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.
159
8
章
ロール：プレイブックのスケールアップ
筆者が
Ansible
を気に入っている理由の
1
つに、
Ansible
でのスケールアップやスケールダウン
のさせ方があります。ここで言っているのは、管理しているホストの台数のことではなく、自動化
しようとしているジョブの複雑さのことです。
Ansible
でスケールダウンが容易なのは、シンプルなタスクが実装しやすいためです。スケール
アップが容易なのは、複雑なジョブを小さな部分に分割するための仕組みが用意されているからで
す。
ロールは、
Ansible
で
playbook
を複数のファイルに分割するための主要な仕組みです。ロール
のおかげで複雑な
playbook
がシンプルに書けるようになると共に、再利用もしやすくなります。
ロールは、
1
つ以上のホストに割り当てるものと考えてください。これは例えば、データベース
サーバーとして動作するホストに、
database
ロールを割り当てる、といったようなことです。
8.1
ロールの基本構造
Ansible
のロールには、
"database"
といったような名前があります。
database
ロールに関連づ
けられたファイルは
/roles/database/
ディレクトリに置かれます。このディレクトリには、以下
のようなファイルやディレクトリがあります。
roles/database/tasks/main.yml
タスク群
roles/database/files/
ホストにアップロードされるファイル群
roles/database/templates ...
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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.