April 2016
Intermediate to advanced
364 pages
7h 54m
Japanese
Content preview from 初めてのAnsible
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134
7 章 複雑な Playbook
例
7-3
ホストをロードバランサーから外し、パッケージをアップグレードする（続き）
args:
instance_id: "{{ ansible_ec2_instance_id }}"
state: present
ec2_elbs: "{{ item }}"
with_items: ec2_elbs
この例では、
serial
節への引数として
1
を渡すことで、
Ansible
に対して一度に
1
つのホストで
のみ実行するように指示しています。
2
を渡せば、
Ansible
は一度に
2
つのホストで実行するよう
になります。
タスクが失敗した場合、通常
Ansible
は失敗が起きたホストに対するタスクの実行を停止します
が、他のホストでの処理は続行します。ロードバランシングのシナリオでは、すべてのホストでタ
スクが失敗する前に、
play
全体を失敗させたいでしょう。そうしなければ、各ホストをロードバ
ランサーの配下から外し、その後にタスクが失敗すれば、ロードバランサーの配下に
1
台もホス
トがないままになってしまうかも知れません。
serial
節と一緒に
max_fail_percentage
節を使えば、
Ansible
がそれを超えると全体の
play
を
失敗させる、失敗したホストの最大のパーセンテージを指定できます。例えば、以下のように最大
の失敗のパーセンテージを
25%
にしたとしましょう。
- name: upgrade packages on servers behind load balancer ...
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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.